SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 70 ›› Issue (6): 139-148.DOI: 10.1016/j.cjche.2024.02.009

• • 上一篇    下一篇

Cation-doped LiNi0.8Co0.1Mn0.1O2 cathode with high rate performance

Long Zhang1,2, Dongsheng Yang3, Lilei Miao3, Chunmeng Zhang1,2, Jiexiang Li1,2, Jiawei Wen1,2, Chunxia Wang1,2, Tiantian Cao4,5, Guoyong Huang1,2, Shengming Xu6,7   

  1. 1. College of New Energy and Materials, China University of Petroleum, Beijing 102249, China;
    2. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Beijing 102249, China;
    3. Beijing Spacecrafts, Beijing 100094, China;
    4. SINOPEC Sales Co., Ltd., Beijing 100728, China;
    5. SINOPEC Research Institute of Petroleum Processing Co., Ltd, Beijing 100083, China;
    6. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
    7. Beijing Key Laboratary of Fine Ceramics, Tsinghua University, Beijing 100084, China
  • 收稿日期:2023-11-15 修回日期:2024-01-16 出版日期:2024-06-28 发布日期:2024-08-05
  • 通讯作者: Tiantian Cao,E-mail:aott65855@sinopec.com;Guoyong Huang,E-mail:huanggy@cup.edu.cn
  • 基金资助:
    This project was supported by the National Natural Science Foundation of China (52274307), National Key Research and Development Program of China (2021YFC2901100), Science Foundation of China University of Petroleum, Beijing (2462022QZDX008, 2462021QNX2010), State Key Laboratory of Heavy Oil Processing (HON-KFKT2022-10).

Cation-doped LiNi0.8Co0.1Mn0.1O2 cathode with high rate performance

Long Zhang1,2, Dongsheng Yang3, Lilei Miao3, Chunmeng Zhang1,2, Jiexiang Li1,2, Jiawei Wen1,2, Chunxia Wang1,2, Tiantian Cao4,5, Guoyong Huang1,2, Shengming Xu6,7   

  1. 1. College of New Energy and Materials, China University of Petroleum, Beijing 102249, China;
    2. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Beijing 102249, China;
    3. Beijing Spacecrafts, Beijing 100094, China;
    4. SINOPEC Sales Co., Ltd., Beijing 100728, China;
    5. SINOPEC Research Institute of Petroleum Processing Co., Ltd, Beijing 100083, China;
    6. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
    7. Beijing Key Laboratary of Fine Ceramics, Tsinghua University, Beijing 100084, China
  • Received:2023-11-15 Revised:2024-01-16 Online:2024-06-28 Published:2024-08-05
  • Contact: Tiantian Cao,E-mail:aott65855@sinopec.com;Guoyong Huang,E-mail:huanggy@cup.edu.cn
  • Supported by:
    This project was supported by the National Natural Science Foundation of China (52274307), National Key Research and Development Program of China (2021YFC2901100), Science Foundation of China University of Petroleum, Beijing (2462022QZDX008, 2462021QNX2010), State Key Laboratory of Heavy Oil Processing (HON-KFKT2022-10).

摘要: The nickel-rich layered cathode material LiNi0.8Co0.1Mn0.1O2 (NCM811) has high energy density, lower cost and is a promising cathode material currently under development. However, its electrochemical and structural stability is poor during cycling. Among the many modification methods, cation doping has been consistently proven to be an effective strategy for enhancing electrochemical performance. Herein, the NCM811 cathode material was modified by solid-phase reactions with Mg and Al doped. In addition, the corresponding mechanism of NCM811 cathode material-doped modification is explored by density functional theory (DFT) calculations, and we have extended this approach to other ternary cathode materials with different ratios and obtained universal laws. Combined with DFT calculations, the results show that Mg2+ occupies the Li+ site and reduces the degree of Li+/Ni2+ mixture; Al3+ acts as a structural support during charging and discharging to prevent structural collapse. The electrochemical properties were tested by an electrochemical workstation and the LAND system, and the results showed that the capacity retention rate increased to varying degrees from 63.66% to 69.87% and 89.05% for NCM811-Mg and NCM811-Al at room temperature after 300 cycles, respectively. This study provides a theoretical basis and design strategy for commercializing cationic-doped modification of nickel-rich cathode materials.

关键词: Li-ion batteries, Cathode materials, Doped, Electrochemical properties, DFT calculation

Abstract: The nickel-rich layered cathode material LiNi0.8Co0.1Mn0.1O2 (NCM811) has high energy density, lower cost and is a promising cathode material currently under development. However, its electrochemical and structural stability is poor during cycling. Among the many modification methods, cation doping has been consistently proven to be an effective strategy for enhancing electrochemical performance. Herein, the NCM811 cathode material was modified by solid-phase reactions with Mg and Al doped. In addition, the corresponding mechanism of NCM811 cathode material-doped modification is explored by density functional theory (DFT) calculations, and we have extended this approach to other ternary cathode materials with different ratios and obtained universal laws. Combined with DFT calculations, the results show that Mg2+ occupies the Li+ site and reduces the degree of Li+/Ni2+ mixture; Al3+ acts as a structural support during charging and discharging to prevent structural collapse. The electrochemical properties were tested by an electrochemical workstation and the LAND system, and the results showed that the capacity retention rate increased to varying degrees from 63.66% to 69.87% and 89.05% for NCM811-Mg and NCM811-Al at room temperature after 300 cycles, respectively. This study provides a theoretical basis and design strategy for commercializing cationic-doped modification of nickel-rich cathode materials.

Key words: Li-ion batteries, Cathode materials, Doped, Electrochemical properties, DFT calculation