Olivine LiFePO₄ is one of the most widely used cathode materials for lithium-ion batteries,with characteristics of low cost,high safety,environment-friendly,long cycle life and stable operating voltage.In recent years,with the breakthrough of CTP technology and blade battery technology,its commercialization progress has been greatly improved.However,LiFePO₄ has the defects of poor electronic conductivity and low ion diffusion coefficient,which seriously limits the electrochemical capacity of lithium-ion battery.It is of great significance to study on the preparation process and performance enhancement of LiFePO₄. In this paper,the differences of performance and development status of LiFePO₄ and other cathode materials for lithium-ion batteries were compared.The modification methods of preparation and strengthening of LiFePO₄ cathode materials and related research progress and challenges were systematically summarized,and the future development direction and research ideas were put forward.

Lithium is a kind of non-renewable strategic mineral as well as the indispensable raw material for the development of modern industry.Based on the analysis of the characteristic,deposit type,distribution,reserve,yield,demand,security and the industry structure of the lithium resources in China,the problems in Chinese lithium industry at present were pointed out.According to the above problems,some countermeasures and suggestions to promote healthy and sustainable development of lithium industry,such as increasing mineral exploration,enhancing international cooperation,optimizing the industrial structure,efficient use of resources,paying attention to environmental protection,building ecological mining industry and so on,were put forward.

Solar driven photocatalysis is an effective method to prepare clean fuels，degrade pollutants and convert high value-added products to solve the problems of energy shortage and environmental pollution.With the further study of metal halide perovskite，researchers have successfully developed a series of synthesis methods which can prepare perovskite quantum dots with precise composition and morphology control，good product uniformity and high crystallinity，so that perovskite quantum dots can be applied to the field of photocatalysis.The synthesis methods of metal halide perovskite quantum dots by thermal injection，ligand-assisted reprecipitation，solvothermal method and microwave assisted method were reviewed，and the research progress of metal halide perovskite in the aspects of photocatalytic hydrogen evolution，photocatalytic reduction of CO₂，photocatalytic synthesis of organic matter and photocatalytic degradation of organic matter were discussed.Finally，the development prospect of metal halide perovskite photocatalyst was prospected.

Metal oxides are a class of ionic compounds composed of metal cations and oxygen anions.The metal positive ions and oxygen negative ions are arranged into various crystal structures by ion bonding, showing unique physical properties.However, metal oxides are limited in potential application by their wide band gaps, low photon quantum yields and photoelectric conversion efficiencies, high probability of recombination of photo-generated electrons and holes, low gas response speed and negative effects of valence band and conduction band on the electron transfer performance.The research progress of several typical doped metal oxides, such as zinc oxide, titanium dioxide, iron oxide and rare earth oxides is reviewed.The effects of metal doping on the optical, electrical, magnetic and sensing properties of these typical metal oxides is analyzed and their potential application fields and research status are introduced.The future development direction and topics needing attention are put forward.

The current development status of membrane technology for CO₂ removal from natural gas was reviewed.Firstly，the technical characteristics and application situations of various processes for removing CO₂ from natural gas were compared.Compared with other separation methods，the membrane separation method has the advantages of less investment，small footprint，and low energy consumption.The principle of membrane separation，membrane materials，development status of membrane modules，and technical units of membrane technology to remove CO₂ from natural gas were introduced.The process technology unit was further divided into pretreatment unit and membrane separation unit：the pretreatment unit was selected to different removal methods to combine according to the components of the produced raw material gas；the raw material gas was entered the membrane separation unit after passing through the pretreatment unit.According to the actual working conditions，considering the hydrocarbon recovery rate，land occupation，energy consumption，investment and other factors，the membrane decarbonization separation process was reasonably designed.Then，the domestic and foreign application cases for the removal of CO₂ from natural gas by membrane methods were introduced.At present，there were many application cases of foreign membrane methods to remove CO₂ from natural gas，while there were few domestic application cases.Therefore，it was necessary to increase the domestic membrane method to remove CO₂ from natural gas industrial applications.Finally，the development direction of CO₂ removal technology by natural gas membrane method was prospected.The research and development of membrane materials with independent intellectual property rights and maintaining high performance and long?term stability under actual complex working conditions is the focus of future membrane separation technology development.A coupled integrated combined process was that combining two or more single CO₂ removal technologies，such as membrane separation+chemical absorption，membrane separation+temperature swing adsorption，etc.This coupled integrated combined process would provide new directions for the future decarbonization process technological developments.

Metal-organic frameworks（MOFs） have attracted extensive attention due to their large specific surface areas,controllable pore structures and abundant active sites.Recently,MOFs-based materials were widely used in the field of ener-gy storage and conversion; however,the low stability and low conductivity of most MOFs-based materials limit their practical applications.By modifying MOFs based materials,such as the use of high conjugated organic ligands could increase the stabi-lity of MOFs materials or MOFs derivatives could improve their redox active sites and electrical conductivity,thus,the elec-trochemical performances of MOFs-based electrode materials can be improved.In this review,we mainly introduce progress of the pristine MOFs and MOFs derivatives including carbon materials,metal oxides,metal sulfides,metal hydroxide and metal phosphide, etc.in the field of supercapacitor.The results show that multi-metallic MOFs or their derivatives are beneficial to improve the electrochemical performances,the conductive MOFs and the carbon materials,which are derived from MOFs materials,are beneficial to improve the electrical conductivity of electrode materials.Finally, the outlook and prospect of MOFs-based electrode materials for electrochemical energy storage are also point out.The morphology, components and conductivity of the electrode materials are research develop direction in the future work.

The recent research on modified lithium iron phosphate（LiFePO₄） materials as lithium-ion electronic cathode materials was reviewed.Although LiFePO₄ were considered to be the most promising cathode materials for lithium-ion power batteries due to their good stability，high safety and environmental friendliness，their inherent low electronic conductivity and lithium-ion diffusion coefficient deteriorated their electrochemical performance.The study on modification to improve their electrochemical performance was reviewed in this paper.The effects of four modification strategies including elemental doping，surface carbon coating，particle nanosizing and materials compositing on the electrochemical performance of LiFePO₄ were analyzed.Then，the advantages and disadvantages of these four modification strategies were discussed.The analysis showed that the four modification strategies could effectively improve the Li-ion diffusion kinetics and electronic conductivity，but the surface carbon coating and particle nanosizing would conversely reduce the tap density of the materials，resulting in low energy density.Finally，the research direction to solve the existing problems was proposed that it would be a feasible method to develop a modification strategy with coexistence of battery and capacitive properties.

Hierarchical titanium silicalite-1（h-TS-1） was synthesized by sol-gel method with cetyltrimethyl-ammonium bromide（CTAB） as mesopores template.Structural features of the h-TS-1 were characterized by transmission electron microscope（TEM）,X-ray diffraction（XRD）,N₂ adsorption-desorption,ultraviolet-visible diffuse reflectance spectroscopy（DR UV-vis） and Fourier transform infrared spectroscopy（FT-IR）.Catalytic performance of the h-TS-1 was investigated by the direct hydroxylation of benzene and phenol,using H₂O₂ as oxidant under mild conditions.The results indicated that the h-TS-1 not only possessed the same MFI topology and ideal crystal form as TS-1,but also had microporous and mesoporous structure,of which the average pore size was 2.67 nm.Compared with TS-1,the catalytic activity of h-TS-1 had been improved significantly.Furthermore,the h-TS-1 had a great capacity of reutilization.

At present,commercial lithium ion batteries（LIBs） mostly use organic liquid electrolyte,which is flammable,explosive,leaky and other security risks.The use of solid electrolyte instead of organic liquid electrolyte could effectively improve the safety of batteries.The solid electrolyte for Li-ion battery can be divided into inorganic electrolyte and organic（polymer） electrolyte.Inorganic solid electrolyte has good adaptability to high temperature or other corrosive environment,which is suitable for rigid battery in extreme working environment;polymer solid electrolyte has obvious advantages in flexibility and processability,which is suitable for flexible battery and other fields,but these materials still have problems to be solved.Inorganic-organic complex is expected to integrate the advantages of the two materials,learn from each other and improve the comprehensive performance and practical value of solid electrolyte.

Lithium resources are important national strategic resources,which are widely used in many fields such as new energy vehicles,electronic products,and energy storage.China is rich in lithium resources.Among them,salt lake brine lithium resources are mainly distributed in Qinghai and Tibet.However,due to factors such as the low grade of salt lake brine itself,low extraction efficiency of lithium salt and limited production capacity,it has not been effectively developed,resulting in a serious dependence on foreign lithium products.Therefore,in order to ensure the continuous and safe supply of lithium resources in China,it is of great significance to break through the lithium extraction technology from salt lakes and explore more green,efficient and low-cost extraction technologies for the utilization of lithium resources in salt lake brines.The general situation of lithium resources in salt lakes,the characteristics of salt lake brine,and the latest research progress of efficient separation and extraction of lithium resources were systematically introduced.Finally,the research focus of lithium resources separation and extraction technology was prospected.

Hydrogen energy is recognized as an ideal green energy.The development and utilization of hydrogen energy can not only get rid of the long-term dependence on traditional fossil energy,but also solve the problems of energy shortage and environmental pollution.The low-cost,efficient and environmentally friendly production of hydrogen is conducive to the im-plementation of China′s energy structure transformation and sustainable development strategy.Among them,the use of renew-able biomass-derived compounds for hydrogen production has attracted more and more attention.From the perspective of chemistry and energy,the research on hydrogen production by reforming with the three major biomass-derived compounds of bio-alcohols,phenols and acids as raw materials at home and abroad was reviewed and commented,the reaction mechanism of hydrogen production from the reforming of these biomass-derived compounds was analyzed,and the effect of catalysts and carriers on hydrogen production from the reforming and the problems faced by the catalytic system and the improvement methods were centrally elaborated.In view of the current research trend of hydrogen production,which focused on catalyst modification,carrier optimization and process improvement,the future research direction of developing new carriers and additives,enriching catalyst systems and integrating various hydrogen production processes were proposed.

CuO/BiVO₄ thin films with nanoporous network structure were prepared on FTO glass by electrochemical deposition.X-ray diffraction（XRD）,Raman spectroscopy（Raman）,scanning electron microscopy（SEM） and energy spectrum analysis（EDS） were used to analyze the composition and structure of the film,and linear voltammetric scanning（LSV） and frequency impedance test（EIS） were used to test the photoelectric properties of the film.The doping of CuO could improve the photoelectric properties of BiVO₄ thin films.The photocurrent density of 40 mmol/L CuO/BiVO₄ film was 1.39 mA/cm² at 1.23 Vvs.RHE,which was about twice as high as that of pure BiVO₄ film（0.7mA/cm²）.The results showed that the nanoporous network structure improved the light utilization efficiency of the film,and also increased the contact area between the film and electrolyte.The photocurrent density of CuO/BiVO₄ thin films was increased by inhibiting the recombination of photogenerated electron-hole pairs after the formation of heterojunction between CuO and BiVO₄.

Metal-organic frameworks（MOFs） are a class of porous materials formed by self-assembly of metal ions（or clus-ters） with organic ligands^[1] MOFs have extremely developed pore structure,and their specific surface area and pore volume are far superior to other porous materials.The feature of organic/inorganic hybridization has also given infinite structural and functional tunability to MOFs that other materials（such as zeolite and activated carbon,etc.） do not possess^[2].In addition,MOFs have persistent pores and cavitation that remove the guest molecules while the host framework remains intact,which makes MOFs exceptionally chemically and physically stable.Based on these characteristics,MOFs have many applications in many fields^[3-4],such as catalysis^[5],H₂ storage^[6],CO₂ capture^[7],drug delivery^[8],pollutants adsorption^[9],biomedical imaging^[10] and so on.The commercialization of MOFs has become a hot spot.Many applications of MOFs are related to sustainable development and “green materials”,but the synthesis process of MOFs itself also needs to consider sustainability and environ-mental impacts.The environmental challenges facing metal organic chemistry are unique because they link the hazards of metalions and organic ligands,and most of the synthesis process requires a lot of energy.This review mainly introduces the green and sustainable synthesis of metal-organic framework materials,which are mainly divided into four aspects：1）using safer or biocompatible ligands;2）using greener,low-cost metal sources;3）development of green solvents;4）solvent-free synthesis.

The fiber composite silica aerogel materials were prepared using alumina silicate fiber or glass fiber as framework via sol-gel process and ambient pressure drying technology.The structure and properties of the produced materials were tested and analyzed.The results showed that silica aerogels were attached to the fiber surfaces which improve the mechanical properties of the materials.The sound insulation performance of alumina silicate fiber composite silica aerogel material was better than that of glass fiber composite silica aerogel material.The two kinds of fiber composite silica aerogel materials met the requirement of Level A on high thermal resistance and combustibility.The alumina silicate fiber composite silica aerogel material and glass fiber composite silica aerogel material met the requirement of Level AQ₁ and Level AQ₂ on smoke toxicity,respectively.And their thermal conductivities were 0.034 W/(m·K) and 0.033 W/(m·K),respectively.

In the face of the crisis caused by the deteriorating greenhouse effect,countries have agreed to take measures to re-duce carbon dioxide emissions.China has promised to peak its carbon emissions around 2030.However,carbon dioxide emis-sions control and capture（CCS） remains a major global environmental challenge.Carbon dioxide sequestration has been the direction and focus of researchers,who also attempts to introduce a new method,i.e.carbon dioxide utilization to achieve more thorough and efficient carbon capture and sequestration.Some studies have pointed out that mineralization is a new direction of carbon dioxide utilization,and its advantages of environmental protection and low cost have attracted people′s attention.Carbon capture and utilization by seawater has promoted the further research of carbon dioxide mineralization under another threat of freshwater shortage,which not only achieves the fixed utilization of CO₂,but also solves the problem of seawater pre-treatment or brine waste utilization from the desalination plant.The research progress of carbon dioxide capture,fixation and utilization methods in recent years was summarized.Through the analysis of the advantages and disadvantages of various methods,it was found that the concept of carbon utilization has injected new vitality into CCS.

From the perspective of the advent of the Anthropocene,the importance and technological progress of inorganic solid waste treatment in China in recent years were summarized.China′s inorganic solid waste can be divided into several types,such as silicon-calcium,silicon-aluminum,gypsum type,calcium-magnesium and compound type,according to their chemical composition and processing characteristics.The technical direction of this kind of solid waste treatment were introduced and prospected.Then the reference for technical personnel engaged in related work could be provided .

Zinc oxide nanoparticles are a kind of novel inorganic functional materials，which are widely used in various fields such as rubber，coating，and catalysis.The liquid-phase synthesis techniques for zinc oxide nanoparticles have the advantages of easy control of particle size and morphology，low economic cost and feasibility for industrial-scale production.A comprehensive review was conducted on liquid-phase methods for the synthesis of zinc oxide nanoparticles，including microemulsion，sol-gel，hydrothermal/solvothermal，and chemical precipitation methods.The basic principles and key influencing factors of each method were elucidated.The crucial role of process intensification techniques in the preparation of zinc oxide nanoparticles were emphasized.Furthermore，a novel approach of “bubble-liquid film method” was introduced.This method involved the rapid mixing of surfactants with the reaction solution and air to create a nanoscale reaction environment with high bubble density.The nucleated crystals grew within a liquid film of 10 to 100 nm between bubbles.By controlling the thickness of the liquid film between bubbles，the particle size of the product could be regulated，leading to uniform and non-agglomerated nanoparticles.This approach was expected to achieve low-cost，continuous，and large-scale production of zinc oxide nanoparticles.

Mixed matrix membranes（MMMs） is a kind of membrane material of combining the characteristics of inorganic fillers and organic matrices has been widely concerned because of its good permeability and separation performance.The inor-ganic fillers,such as SiO₂ nanoparticle spheres,zeolite molecular sieves,metal-organic framework （MOF）,graphene oxide （GO）and carbon nanotubes（CNT） are all widely applied in the preparation of MMMs,but issues of poor dispersion,poor compati-bility and existence of interface defects often lead to poor gas separation performance.The factors that improve the gas separa-tion performance of MMMs through surface functional modification,covalent cross-linking,multiple fillers and size and mor-phology controlling in recent years were summarized and decomposed.The development trend of MMMs in the future was also prospected.

Photocatalysis technology is a new green environmental protection technology with resource saving,environmental friendliness and great application prospect in the field of organic pollutant treatment.As a typical semiconductor photocatalyst,TiO₂ is favored by people for its good photoactivity,good stability,non-toxic to human health,low cost,mild reaction conditions and no secondary pollution etc..However,its wide band gap and higher recombination rate of photogenerated electronhole pair limit its large-scale application,which are technical problems to be solved.The catalytic mechanism of TiO₂ was explained.The limitations of traditional TiO₂ were analyzed.And the modification methods and principles for improving the catalytic activity of TiO₂,such as ion doping,surface deposition of precious metals,surface photosensitization,semiconductor composite,load and other methods,were introduced.At last the future research and development direction of TiO₂ photocatalyst were discussed.

The design of electrocatalytic oxygen evolution reaction（OER） electrodes materials with high efficiency and low cost is of great significance to enhance the performance of electrochemical energy conversion and storage systems in large scale.Two kinds of cobalt oxides,such as CoO and Co₃O₄,on carbon fiber paper （CFP） were synthesized via solvothermal method and calcination in different atmosphere and applied them as OER electrodes.X-ray diffraction（XRD）,field emission scanning electron microscope（FESEM） and X-ray photoelectron spectroscopy（XPS） were used to characterize and analyze the phases,morphology and surface valence of the as-prepared cobalt oxides samples.Results showed that CoO nanosheet was obtained by calcination in nitrogen atmosphere,while Co₃O₄ nanosheet was obtained in air atmosphere.Linear sweep voltammetry（LSV）,cyclic voltammgrams（CV）,electrochemical impedance spectroscopy（EIS） and chronopotentiometric measurements were used to investigate the as-prepared cobalt oxides samples for OER performance.Results indicated that CoO electrode exhibited better OER activity and stability compared to that of Co₃O₄ electrode.In 1 mol/L KOH electrolyte,CoO and Co₃O₄ electrodes require 1.568 V and 1.617 V at a current density of 10 mA/cm ²,respectively.