高镍三元正极材料表面碱性物质研究进展

doi:10.19964/j.issn.1006-4990.2021-0046

Abstract

Abstract:

Alkaline substance is prone to form on the surface of nickel-rich ternary cathode materials,which accelerate the capacity fade and short the life of lithium-ion batteries.Therefore,it is vital to control the content of the lithium hydroxide and lithium carbonate on the surface of the nickel-rich cathode material for improving the performance and safety of batteries.The formation mechanism and the treatment of the lithium hydroxide and lithium carbonate on the surface of the Nickel-rich cathode materials were summarized.The effect of H₂O and CO₂ in the environment on the formation of the lithium hydroxide and lithium carbonate was discussed from different perspectives.The phase transformation of surface structure caused by the migration and solidification of Li⁺ and transition metals during the formation of alkaline materials on surface was discussed,wich led to the deterioration of the processing and storage properties of ternary cathode materials.Washing,drying,low tempera-ture sintering and the other “alkali-reducing” processes were also emphasized,it explained the effect of the washing process on the reduction of alkaline substances on the surface of the ternary material and the effect on the material properties.It was poin-ted out that it was necessary to choose appropriate washing and drying conditions to reduce the variation of the material surface.Finally,combined with the current alkali reduction process,suggestions on the follow-up research direction were put forward.

Key words: nickel-rich cathode material, lithium ion battery, lithium carbonate, washing

CLC Number:

TQ131.11

HU Yue,XU Lele,ZHOU Yanfang,XU Zhe,TIAN Shoushuai,LIAO Fan,YANG Xiaojun. Research progress on alkaline substance on surface of nickel-rich ternary cathode materials[J]. Inorganic Chemicals Industry, 2021, 53(12): 74-79.

Figures/Tables 4

References 43

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