Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (10): 3051-3061.doi: 10.19799/j.cnki.2095-4239.2022.0480

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Research progress of high capacity Li-Mn-rich cathode materials

Jun WANG1,2(), Xuequan ZHANG1,2, Yafei LIU1,2(), Yanbin CHEN1,2()   

  1. 1.BGRIMM Technology Group
    2.Beijing Easpring Material Technology Co. , Ltd. , Beijing 100160, China
  • Received:2022-08-25 Revised:2022-09-01 Online:2022-10-05 Published:2022-10-10
  • Contact: Yafei LIU, Yanbin CHEN E-mail:wangjun@easpring.com;liuyafei@easpring.com;chenyanbin@e aspring.com

Abstract:

Layered Li-Mn-rich materials (LMR) are promising to be next generation cathodes for lithium-ion batteries due to their high specific capacity (>250 mAh/g) and low cost. It has been nearly 30 years since the discovery of LMR material, but it has never been commercialized for the following reasons: During the cycling process, Mn3+ migrates into Li sites makes the layered structure transform to spinel structure, resulting in a serious discharge voltage decay, which causing serious energy loss and bringing great challenges to battery management. The low electronic conductivity of Li2MnO3 makes LMR material have poor rate capability and lower electrode density results in lower volume energy density of LMR. In addition, the LMR materials need to be at high voltage (>4.55 V) to show high capacity, but the electrolyte at high voltage is easy to oxidize and decompose, accompanied by the release of lattice oxygen into O2, the above problems seriously affected LMR commercialization process. Based on the research and development results of LMR materials over the years, this paper reviews the research progress of LMR materials in the understanding of charge and discharge mechanism, precursor process route selection, modification effect and mechanism of bulk doping, surface coating, liquid and gas phase post-treatment, and the design of new special structures such as O2/O3 composite structure and single crystal structure. In addition, the future development direction and commercial prospect of LMR materials are prospected to help the industrial development of LMR materials.

Key words: Li-Mn-rich materials, charge and discharge mechanism, modification, post-treatment

CLC Number: