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Al-Ni掺杂改性LiMn2O4正极材料合成及电化学性能
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作者单位:

1.昆明理工大学环境科学与工程学院,昆明市生态环境局五华分局生态环境监测站;2.云南民族大学化学与环境学院;3.昆明理工大学环境科学与工程学院

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中图分类号:

TM912

基金项目:

国家自然科学基金项目(面上项目51972282,重点项目U1602273)


Preparation and Electrochemical Performance of Al-Ni Doped Modified LiMn2O4 Cathode Material
Author:
Affiliation:

1.Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;2.School of Chemistry and Environment,Yunnan Minzu University;3.Faculty of Environmental Science and Engineering,Kunming University of Science and Technology

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    采用固相燃烧法快速合成了单晶多面体LiAl0.08Ni0.03Mn1.89O4 (LANMO)锂离子电池正极材料,其单晶颗粒暴露面包含{111}、{110}和{100}晶面。研究结果表明,LANMO材料为单相尖晶石型结构,属于Fd3m空间群,结晶性好,颗粒尺寸200-300 nm。在1 C和5 C倍率下LANMO的初始放电比容量分别为110.6和96 mAh·g-1,循环1000次后容量保持率都达到70%以上;在高温(55 ℃)1 C条件下,LANMO材料也具有114.2 mAh·g-1初始放电比容量,表现出优良的电化学性能。动力学性能测试表明,LANMO样品有较高的Li+离子扩散系数1.58×10-11 cm2·s-1和较低的表观活化能23.89 kJ?mol-1。Al-Ni协同改性提高了单晶多面体尖晶石型LiMn2O4材料的晶体结构稳定性,有效抑制了Jahn-Teller效应及降低Mn溶解和增加Li+扩散通道,增大了Li+扩散速率和电极可逆性,提升了其倍率性能和循环寿命。

    Abstract:

    The cathode material of single-crystal polyhedral LiAl0.08Ni0.03Mn1.89O4(LANMO) was rapidly synthesized by a solid-phase combustion method. The exposed surfaces of the single-crystal particles include {111}, {110} and {100} crystal faces. The results show that, LANMO material is a single-phase spinel structure, belonging to the space group Fd3m and exhibits a good crystallinity, the particle size is between 200 to 300 nm. The initial discharge specific capacity of LANMO is 110.6 and 96 mAh·g-1 at 1 C and 5 C, respectively, and the capacity retention rate reaches more than 70% after 1000 cycles. Under the elevated temperature (55 ℃) 1 C condition, the LANMO material also has an initial discharge specific capacity of 114.2 mAh·g-1, showing an excellent electrochemical performance. The kinetic performance test shows that the LANMO sample has a higher Li+ ion diffusion coefficient of 1.58×10-11 cm2 s-1 and a lower apparent activation energy of 23.89 kJ·mol-1. The Al-Ni synergistic modification improves the crystal structure stability of single crystal polyhedral spinel LiMn2O4 material, inhibits the Jahn-Teller effect effectively, reduces Mn dissolution, increases Li+ diffusion channels, Li+ diffusion rate and electrode reversibility as well as improves the rate performance and cycle life.

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郭昱娇,卢瑶,宁平,郭俊明. Al-Ni掺杂改性LiMn2O4正极材料合成及电化学性能[J].稀有金属材料与工程,2021,50(12):4525~4533.[Guo Yujiao, Lu Yao, Ning Ping, Guo Junming. Preparation and Electrochemical Performance of Al-Ni Doped Modified LiMn2O4 Cathode Material[J]. Rare Metal Materials and Engineering,2021,50(12):4525~4533.]
DOI:10.12442/j. issn.1002-185X.20200990

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历史
  • 收稿日期:2020-12-22
  • 最后修改日期:2021-04-15
  • 录用日期:2021-05-12
  • 在线发布日期: 2022-01-09
  • 出版日期: 2021-12-24