首页|新型高镍无钴正极材料LiNi0.94Mn0.04Al0.02O2的合成研究

新型高镍无钴正极材料LiNi0.94Mn0.04Al0.02O2的合成研究

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采用固相烧结工艺合成了层状高镍无钻正极材料LiNi0.94Mn0.04Al0.02O2(NMA),并研究了不同烧结温度对NMA正极材料的晶体结构、微观形貌和电化学性能的影响.结果表明,当烧结温度过低时,NMA正极材料的结晶度偏低,并在表面形成残锂.烧结温度过高则会导致层状结构变差和电极表面有害副反应增多.在最佳烧结温度750 ℃下合成的NMA-750材料具有良好的颗粒形貌、最少的锂镍混排和最完整的层状结构,同时具有最佳的电化学性能:首圈放电比容量(3.0～4.5 V,1 C)为199.5 mA·h/g,循环100圈后容量保持率可达79.04％;在5 C下仍具有147.6 mA·h/g的放电比容量,倍率性能优良.
Study on Synthesis of a Novel Ni-Rich Co-Free Cathode Material LiNi0.94Mn0.04Al0.02O2
Lamellar Ni-rich Co-free cathode material LiNi0.94Mn0.04Al0.02O2(NMA)was synthesized by a solid-phase sintering process,and the effects of different sintering temperatures on the crystal structure,microstructure and electrochemical performance of NMA cathode material were investigated.The results show that with excessively low sintering temperature,the crystallinity of the NMA cathode material is re-latively low and residual lithium is formed on the surface,while the extremely high sintering temperature leads to a deterioration of the lamellar structure and an increase in harmful side reactions on the electrode surface.The NMA-750 material synthesized at the optimal temperature of 750 ℃ demonstrates excellent particle morphology,minimal lithium-nickel mixing,and the most complete lamellar structure.Simultane-ously,the material exhibits the optimal electrochemical performance:its initial discharge specific capacity(3.0～4.5 V,1 C)is 199.5 mA·h/g,and the capacity retention rate reaches 79.04％after 100 cycles.It also has a discharge specific capacity of 147.6 mA·h/g at 5 C,presenting excellent rate performance.

nickel-rich cobalt-free cathode materialLiNi0.94Mn0.04Al0.02O2sintering temperaturecrystal structuremicrostructureelectrochemical performancelamellar structure

杨泽龙、孟奇

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昆明理工大学冶金与能源工程学院锂离子电池及材料合成技术国家地方联合工程研究中心,云南昆明 650093

高镍无钴正极材料 LiNi0.94Mn0.04Al0.02O2 烧结温度 晶体结构 微观形貌 电化学性能 层状结构

云南省科技重大专项

202202AG050003

2024

10.19990/j.issn.1004-0536.2024.01.106.06

稀有金属与硬质合金
中国有色金属学会，长沙有色冶金设计研究院有限公司

稀有金属与硬质合金

北大核心
影响因子：0.32
ISSN：1004-0536
年,卷(期)：2024.52(1)
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