汽车锂电池正极材料的制备与性能研究

doi:10.11962/1006-4990.2020-0133

Abstract

Abstract:

The effects of Mo doping on the phase composition,microstructure and electrochemical properties of cathode material[Mn_0.58Ni_0.18Co_0.14]_0.8-xMo_x（OH）₂ for vehicle lithium batteries were studied.The results showed that the x=0.005 ca-thode material exhibits the strongest superlattice diffraction peak due to the strongest superlattice structure stability,while the existence of Li₂MoO₄ heterophase peak in the x=0.01 and x=0.02 cathode materials will destroy the superlattice structure to a certain extent;the particle size of the cathode materials with different Mo doping will increase with the increase of Mo content;Mo doping can improve the Li separation of the positive materials and it can eliminate the influence of amorphous Li₂CO₃ thin layer by sub keying ability,but excessive Mo doping will form Li₂MoO₄ compound; x=0.005 cathode material has the highest discharge specific capacity and the smallest charge transfer impedance,and Li ion is easily embedded and detached more during charging and discharging,so it has high power discharge performance.It is mainly related to the smaller particle size and the formation of pure layered structure,which is helpful to enhance the conductivity of lithium ion and kinetic the reaction rate of lithium ion.

Key words: lithium battery, cathode material, Mo, microstructure, electrochemical performance

CLC Number:

TQ131.11

Fan Qingke,Meng Qinghua,Luo Fengyu. Study on preparation and properties of cathode materials for vehicle lithium battery[J]. Inorganic Chemicals Industry, 2021, 53(1): 44-49.

Figures/Tables 9

References 28

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正极材料	充电容量/ （mA·h/g）	放电容量/ （mA·h/g）	库伦效率/ %	倾斜区域/ （mA·h/g）	平台区域/ （mA·h/g）
LM	317.3	231.7	73.0	102	211.3
LM-MO_0.005	303.4	238.5	78.6	107	192.4
LM-MO_0.01	281.9	229.0	81.3	119	163.9
LM-MO_0.02	279.4	193.9	69.4	111	169.4

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation and properties of cathode materials for vehicle lithium battery

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