高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (12): 2574-2582.doi: 10.7503/cjcu20190346

• 物理化学 • 上一篇    下一篇

尖晶石型锰酸锂正极材料LiNi0.01Co0.03Mn1.96O4的合成及电化学性能

段玉珍,朱金玉,郭俊明(),向明武(),刘晓芳,白红丽,苏长伟   

  1. 云南民族大学化学与环境学院, 生物基材料绿色制备技术国家地方联合工程研究中心,云南省高校绿色化学材料重点实验室, 昆明 650500
  • 收稿日期:2019-06-19 出版日期:2019-12-04 发布日期:2019-12-04
  • 通讯作者: 郭俊明,向明武 E-mail:guojunming@tsinghua.org.cn;xmwbboy@163.com
  • 基金资助:
    国家自然科学基金(U1602273);国家自然科学基金(51972282)

Synthesis and Electrochemical Properties of Spinel Lithium Manganese Cathode Material LiNi0.01Co0.03Mn1.96O4

Yuzhen DUAN,Jinyu ZHU,Junming GUO(),Mingwu XIANG(),Xiaofang LIU,Hongli BAI,Changwei SU   

  1. School of Chemistry and Enviroment, National and Local Joint Engineering Research Center for Green Preparation Technology of Bio-based Materials, Key Laboratory of Green Chemical Materials in Universities of Yunnan Province, Yunnan Minzu University, Kunming 650500, China
  • Received:2019-06-19 Online:2019-12-04 Published:2019-12-04
  • Contact: Junming GUO,Mingwu XIANG E-mail:guojunming@tsinghua.org.cn;xmwbboy@163.com
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(U1602273);the National Natural Science Foundation of China(51972282)

摘要:

采用固相燃烧法制备了具有多面体形貌的Ni-Co共掺杂尖晶石型LiNi0.01Co0.03Mn1.96O4(LNCMO)正极材料. 研究结果表明, LNCMO具有优异的倍率性能和长循环稳定性, 在25 ℃, 1C或5C倍率条件下, 初始放电比容量分别为110.6和102.3 mA·h/g, 循环1000次后容量保持率为75.7%和78.3%; 在10C和20C高倍率下, 循环1000次后, 容量保持率分别为78.8%和54.2%; 即使在高温(55 ℃)和1C倍率下, 循环1000次后容量保持率仍为76.6%. LNCMO具有较大的Li +扩散系数(4.77×10 -11 cm 2/s)和较低的表观活化能(23.37 kJ/mol).

关键词: Ni-Co共掺杂, 尖晶石型LiMn2O4, 固相燃烧法, 锂离子电池

Abstract:

Ni-Co co-doped LiNi0.01Co0.03Mn1.96O4(LNCMO) cathode material with a polyhedral morphology was prepared via a solid-state combustion method. Results show that the LNCMO sample has excellent rate performance and long cycling stability, it delivers the initial discharge capacity of 110.6 and 102.3 mA·h/g with capacity retention rate of 75.7% and 78.3% after 1000 cycles at 1C and 5C at 25 ℃, respectively. At high current rate of 10C and 20C, the capacity retention rates of 78.8% and 54.2% are obtained after 1000 cycles, respectively. Even at 1C under high temperature of 55 ℃, the capacity retention rate of 76.6% is also maintained after 1000 cycles. The LNCMO sample shows larger Li + ion diffusion coefficient(4.77×10 -11 cm 2/s) and lower apparent activation energy(23.37 kJ/mol) compared to the Co-doped sample.

Key words: Ni-Co co-doping, Spinel LiMn2O4, Solid-state combustion method, Lithium ion battery

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