无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2025, Vol. 57 ›› Issue (9): 82-87.doi: 10.19964/j.issn.1006-4990.2024-0439

• 研究与开发 • 上一篇    下一篇

协同改性提升三元正极材料LiNi0.9Co0.05Mn0.05O2结构稳定性研究

张龙华(), 张志超   

  1. 郑州铁路职业技术学院,河南 郑州 450052
  • 收稿日期:2024-08-06 出版日期:2025-09-10 发布日期:2024-10-16
  • 作者简介:张龙华(1989— ),男,硕士,讲师,研究方向为新能源材料;E-mail:604043692@qq.com
  • 基金资助:
    郑州铁路职业技术学院科研项目(2025KY29)

Study on synergistic modification to improve structural stability of ternary cathode material LiNi0.9Co0.05Mn0.05O2

ZHANG Longhua(), ZHANG Zhichao   

  1. Zhengzhou Railway Vocational Technical College,Zhengzhou 450052,China
  • Received:2024-08-06 Published:2025-09-10 Online:2024-10-16

摘要:

锂离子电池(LIBs)在电动汽车(EV)中发挥着至关重要的作用,高镍层状金属氧化物(LiNi x Co y Mn1-x-y O2,NCM,x≥0.8)是锂离子电池正极材料中最主要的类型之一。为了提高电动汽车的续航里程,增加NCM正极材料中镍含量可以提升电动汽车的实际放电比容量,然而高镍含量导致正极材料结构不稳定和容量保持能力较差。掺杂外源元素的策略可以很好地解决上述问题,利用固相烧结的方法,研究了一种通过高价W原子掺杂抑制晶格变形引起体积收缩问题的策略,同时掺杂非活性Ti原子来稳定刚性框架,这种策略能显著抑制应力的集中,从而稳定结构防止微裂纹的形成,提高电化学性能。由于其独特的结构特性,在0.1C倍率下的初始容量为221.4 mA·h/g,0.5C倍率循环200次后放电比容量为162.9 mA·h/g,容量保持率为74.6%,为高性能层状正极材料的设计提供了思路。

关键词: 锂离子电池, 高镍层状金属氧化物, 双掺杂, 微裂纹, 放电比容量

Abstract:

Lithium-ion batteries(LIBs) play a crucial role in electric vehicles(EVs),high nickel layered metal oxides (LiNi x Co y Mn1-x-y O2,NCM,x≥0.8) are one of the most important types of cathode materials for lithium-ion batteries.In order to improve the driving range of electric vehicles,increasing the nickel content in NCM cathode material can improve the actual specific discharge capacity of electric vehicles.However,high nickel content leads to structural instability of the cathode material and poor capacity retention ability.The strategy of doping exogenous elements can solve the above problems well.Using the method of solid phase sintering,a strategy of suppressing the volume shrinkage caused by lattice deformation by doping with high price W atoms was studied,while doping inactive Ti atoms to stabilize the rigid frame.This strategy significantly inhibited the concentration of stress,thereby stabilizing the structure,preventing the formation of micro-cracks,and improving electrochemical performance.Due to its unique structural characteristics,the initial capacity at 0.1C was 221.4 mA·h/g,the specific discharge capacity after 200 cycles at 0.5C was 162.9 mA·h/g,and the capacity retention rate was 74.6%.This study provided a new idea for the design of high performance layered cathode materials.

Key words: lithium-ion batteries, high nickel layer metal oxide, double doping, microcrack, discharge specific capacity

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