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材料导报  2023, Vol. 37 Issue (14): 21120089-8    https://doi.org/10.11896/cldb.21120089
  无机非金属及其复合材料 |
Ni-La双掺LiMn2O4截角八面体正极材料的制备及电化学性能
李燕1, 张俊杰2, 郭俊明1,*
1 云南民族大学化学与环境学院,昆明 650500
2 西安交通大学物理学院,西安 710049
Preparation and Electrochemical Performance of Ni-La Double-doped LiMn2O4 Truncated Octahedral Cathode Material
LI Yan1, ZHANG Junjie2, GUO Junming1,*
1 School of Chemistry and Environment, Yunnan Minzu University, Kunming 650500, China
2 School of Physics, Xi’an Jiaotong University, Xi’an 710049, China
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摘要 采用溶液燃烧法合成了一种具有{111}和{100}晶面的截角八面体LiNi0.05La0.04Mn1.91O4正极材料。结果表明,Ni-La复合掺杂促进了尖晶石型LiMn2O4晶体的{111}及{100}晶面择优生长,形成了亚微米级截角八面体晶粒形貌的正极材料。在1C下,其首次放电比容量为128.5 mA·h/g,1 000次循环后保持率为65.48%; 10C倍率下,放电比容量为108.2 mA·h/g,1 500次循环后容量保持率为75.8%;在更高倍率15C和20C下,经2 000次长循环后保持率分别为74.76%和76.16%,说明LiNi0.05La0.04Mn1.91O4材料充放电倍率越高,容量保持率越优。该材料具有较大的锂离子扩散系数与较小的表观活化能。Ni-La共掺杂与截角八面体形貌联合调控策略可有效抑制Jahn-Teller畸变,减少Mn溶解及增加Li+迁移通道数量,稳定晶体结构,提升尖晶石型LiMn2O4正极材料的倍率性能和循环寿命。
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李燕
张俊杰
郭俊明
关键词:  LiMn2O4  Ni-La复合掺杂  截角八面体  Jahn-Teller畸变  Mn溶解  正极材料  锂离子电池    
Abstract: The truncated octahedral LiNi0.05La0.04Mn1.91O4 cathode material with {111} and {100} crystal planes was prepared by a solution combustion method. The results show that the Ni-La co-doping promoted the preferential growth of {111} and {100} planes of spinel LiMn2O4 crystals, forming a cathode material with sub-micron truncated octahedral grain morphology. At 1C, the first discharge specific capacity was 128.5 mA·h/g, and the retention rate after 1 000 cycles was 65.48%; at 10C rate, the discharge specific capacity was 108.2 mA·h/g, and the capacity retention rate after 1 500 cycles was 75.8%; at higher rates of 15C and 20C, the retention rates after 2 000 long cycles were 74.76% and 76.16%, respectively, indicating that the higher the charge-discharge rate of LiNi0.05La0.04Mn1.91O4 material, the better the capacity retention rate. The material has a larger lithium-ion diffusion coefficient and a smaller apparent activation energy. The combined control strategy of Ni-La co-doping and truncated octahedral morphology can effectively suppress Jahn-Teller distortion, reduce Mn dissolution, and increase the number of Li+ migration channels, stabilize the crystal structure, and increase the rate performance and cycle life of spinel LiMn2O4 cathode material.
Key words:  LiMn2O4    Ni-La co-doping    truncated octahedron    Jahn-Teller distortion    Mn dissolution    cathode material    lithium-ion battery
出版日期:  2023-07-25      发布日期:  2023-07-24
ZTFLH:  TM912  
基金资助: 国家自然科学基金(51972282)
通讯作者:  *郭俊明,云南民族大学化学与环境学院教授、硕士研究生导师,云南省中青年学术技术带头人,云南省高等学校教学名师。1996年四川大学化学系无机化学专业毕业,获理学硕士学位。主要从事锂离子电池正极材料的研究工作。发表学术论文100余篇,授权国家发明专利15项,出版专著1部、教材1部。获云南省科学技术自然科学奖二、三等奖各1项。guojunming@tsinghua.org.cn   
作者简介:  李燕,2021年7月毕业于云南民族大学化学与环境学院,获理学硕士学位,师承郭俊明教授。现就职于滇西应用技术大学普洱茶学院。
引用本文:    
李燕, 张俊杰, 郭俊明. Ni-La双掺LiMn2O4截角八面体正极材料的制备及电化学性能[J]. 材料导报, 2023, 37(14): 21120089-8.
LI Yan, ZHANG Junjie, GUO Junming. Preparation and Electrochemical Performance of Ni-La Double-doped LiMn2O4 Truncated Octahedral Cathode Material. Materials Reports, 2023, 37(14): 21120089-8.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.21120089  或          http://www.mater-rep.com/CN/Y2023/V37/I14/21120089
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