J. Mater. Sci. Technol. ›› 2025, Vol. 207: 266-273.DOI: 10.1016/j.jmst.2024.04.066

• Research article • Previous Articles     Next Articles

Elements gradient doping in Mn-based Li-rich layered oxides for long-life lithium-ion batteries

Yinzhong Wanga,b,1, Shiqi Liua,b,1, Xianwei Guoa,b,e,*, Boya Wanga,b, Qinghua Zhangd, Yuqiang Lia,b, Yulong Wanga,b, Guoqing Wanga,b,e, Lin Guc, Haijun Yua,b,*   

  1. aInstitute of Advanced Battery Materials and Devices, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
    bKey Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, China;
    cNational Center of Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;
    dBeijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    eBeijing Create Energy & Benefit Future Co., Ltd., Beijing 100176, China
  • Received:2024-03-14 Revised:2024-04-02 Accepted:2024-04-09 Published:2025-02-01 Online:2024-05-17
  • Contact: *E-mail addresses: . xwguo@bjut.edu.cn (X. Guo), hj-yu@bjut.edu.cn (H. Yu)
  • About author:1 These authors contributed equally to this work.

Abstract: The cobalt-free Mn-based Li-rich layered oxide material has the advantages of low cost, high energy density, and good performance at low temperatures, and is the promising choice for energy storage batteries. However, the long-cycling stability of batteries needs to be improved. Herein, the Mn-based Li-rich cathode materials with small amounts of Li2MnO3 crystal domains and gradient doping of Al and Ti elements from the surface to the bulk have been developed to improve the structure and interface stability. Then the batteries with a high energy density of 600 Wh kg-1, excellent capacity retention of 99.7 % with low voltage decay of 0.03 mV cycle-1 after 800 cycles, and good rates performances can be achieved. Therefore, the structure and cycling stability of low voltage Mn-based Li-rich cathode materials can be significantly improved by the bulk structure design and interface regulation, and this work has paved the way for developing low-cost and high-energy Mn-based energy storage batteries with long lifetime.

Key words: Mn-based Li-rich layered oxide cathode, Li2MnO3 crystal domain, Elemental gradient, Lithium-ion batteries, Energy storage