Inorganic Chemicals Industry ›› 2025, Vol. 57 ›› Issue (7): 50-56.doi: 10.19964/j.issn.1006-4990.2024-0238

• Research & Development • Previous Articles     Next Articles

Study on effect of lithium concent on electrochemical performance of LiNi0.90Mn0.07Al0.03O2 cathode materials

SHEN Qirongxin(), AI Dengdeng, JIN Shengping, XI Ruheng, HOU Xiaoyi()   

  1. College of Physics and Electronic Information Engineering,Qinghai NormalUniversity,Xining 810000,China
  • Received:2024-04-26 Online:2025-07-10 Published:2024-08-16
  • Contact: HOU Xiaoyi E-mail:shenqirx@163.com;houxy13@foxmail.com

Abstract:

With the increasing demand for battery energy density in modern society,researchers have focused on high-nickel layered cathode materials with high specific capacity.However,the calcination conditions of high-nickel materials are very harsh and the material synthesis is complicated,so it is necessary to explore their synthesis conditions.Three kinds of LiNi0.90Mn0.07Al0.03O2(NMA973) cathode materials with different lithium contents(1.02,1.04,1.06) were successfully prepared by the coprecipitation method,and the effects of different lithium contents on the structural morphology and electrochemical properties of the cathode material NMA973 were investigated.NMA973-1.04 cathode material had a good layered structure as determined by XRD and SEM characterization.The XPS test showed that the Ni3+ of NMA973-1.04 cathode material was high,which further proved that the Li+/Ni2+ mixing degree was low.The ICP test confirmed that the Li content of NMA973-1.04 cathode material was the closest to the design value.The electrochemical tests showed that NMA973-1.04 cathode material had high discharge specific capacity at different rates,the discharge specific capacity of small rate 0.2C could reach 199.00 mA·h/g,and the discharge specific capacity from large rate 5.0C and back to small rate 0.2C could reach 198.60 mA·h/g,with a capacity retention rate of 99.0%.The capacity retention of 89.0% after 100 cycles at 1.0C demonstrated the excellent cycling performance and structural stability of NMA973-1.04 cathode material.The results indicated that the NMA973 cathode material with a lithium distribution of 1.04 had excellent performance.

Key words: lithium-ion battery, Ni-rich ternary cathodes, lithium content, coprecipitation method

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