配锂量对LiNi0.90Mn0.07Al0.03O2正极材料电化学性能影响的研究
收稿日期: 2024-04-26
网络出版日期: 2024-08-16
基金资助
青海省自然科学基金项目(2023-ZJ-983Q)
Study on effect of lithium concent on electrochemical performance of LiNi0.90Mn0.07Al0.03O2 cathode materials
Received date: 2024-04-26
Online published: 2024-08-16
随着现代社会对电池能量密度需求的日益增长，研究者的关注重点放到了高比容量的高镍层状正极材料上，但高镍材料的煅烧条件十分苛刻，材料合成复杂，因此需要探究其合成条件。采用共沉淀法成功制备了3种不同配锂量（1.02、1.04、1.06）的LiNi0.90Mn0.07Al0.03O2（NMA973）正极材料，探究了不同配锂量对正极材料NMA973的结构形貌、电化学性能的影响。通过XRD、SEM表征得出NMA973-1.04正极材料具有良好的层状结构。通过XPS测试得出NMA973-1.04正极材料的Ni3+含量较高，进一步证明Li+/Ni2+混排程度较低。ICP测试证实了NMA973-1.04正极材料的Li含量是最接近设计值的。电化学测试表明，NMA973-1.04正极材料在不同倍率下都显示出较高的放电比容量，小倍率0.2C的放电比容量可以达到199.00 mA·h/g，从大倍率5.0C再回到小倍率0.2C放电比容量仍为198.60 mA·h/g，容量保持率高达99.0%；在1.0C倍率循环100次后容量保持率为89.0%，这展示了NMA973-1.04正极材料的优异循环性能和结构稳定性。结果说明，配锂量为1.04的NMA973正极材料具有优异的性能。
申琦荣欣 , 艾登登 , 金生萍 , 席儒恒 , 后小毅 . 配锂量对LiNi0.90Mn0.07Al0.03O2正极材料电化学性能影响的研究[J]. 无机盐工业, 2025 , 57(7) : 50 -56 . DOI: 10.19964/j.issn.1006-4990.2024-0238
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.
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