富锂锰基正极材料结构优化及晶面调控研究进展

doi:10.11896/cldb.20010086

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Abstract Li-rich manganese cathode material (LMCM) is regarded as the next generation of cathode materials for lithium battery due to its advantages such as high discharge specific capacity (250 mAh·g^-1@0.1C), high voltage, low manufacturing cost and environmental protection, and it is a key electrode material for lithium batteries with energy density exceeding 400 Wh/kg.
In order to solve the problems existing in LMCM, researchers have done a lot of research work. On the one hand, the capacity characteristics and structural evolution of LMCM during the cycle are studied to provide a theoretical basis for LMCM optimization modification. On the other hand, modification method such as surface coating, ion doping, surface acid treatment and other methods has been carried out to improve the electrochemical performance of LMCM, although achieved certain results, but it can not fully meet the needs of use. Therefore, in recent years, researchers have begun to continue to try to optimize the structure of the material and adjust the active crystal plane. While maintaining the advantages of LMCM, it further improves the rate capability and cycle life of the material, reduces the first irreversible capacity loss, and suppresses the voltage decay during the cycle.
The main research directions for the optimization of the crystal structure of materials are the construction of defect systems, layered-spinel he-terostructures, micro-nano structures, porous structures, etc. The optimized structure can effectively shorten the Li⁺ diffusion path during the charge and discharge process and improve the structure strength of the material, reduce the migration of transition metal ions and the phase transition, enhance the permeability of the electrolyte, effectively improve the structure and electrochemical stability of the material; and the crystal plane control by building a structure with α-NaFeO₂ and the crystal direction parallel to the lithium layer as the electrochemical active surface for Li⁺ deintercalation, the crystal plane provides a clear path for Li⁺ diffusion, which can not only shorten the Li⁺ diffusion distance, but also increase the rate of Li⁺ deintercalation, thereby enhancing the material’s ability to charge and discharge at high currents.
In this paper, the research progress of LMCM is summarized, and the capacity characteristics, structural evolution, structural optimization, electrochemical active crystal plane control of materials are introduced respectively. The research results and problems of LMCM are analyzed, and the future research direction is prospected, in order to provide reference for the design and controllable preparation of LMCM.

Key words： Li-rich manganese cathode material structural optimization crystal plane control electrochemical performance

Published: 25 June 2021

CLC number:

TM912

About author:: Jianfeng Zhou received his M.S. degree in metallurgical physical chemistry from Kunming University of Science and Technology in 2011. Now he is the R&D engineer of Kunming Hendera Science and Technology Co., Ltd. His main research areas are electrode mate-rials and new energy storage materials.Hui Huang received her B.E. degree in polymer science from Sichuan University in 2000, M.S. degree in inorganic material in Yunnan University, and obtained her Ph.D degree in metallurgical physical che-mistry from Kunming University of Science and Techno-logy. She was as a visiting scholar in Florida University from 2014 to 2015. She is currently a full professor in Kunming University of Science and Technology, technical director of Kunming Hendera Technology Co., Ltd., deputy director of Yunnan Metallurgical Electrode Materials Engineering Technology Research Center. Her current research interests include conductive energy-saving polymer anode materials, special functional powder mate-rials, metallurgical electrochemical and hydrometallurgical new materials. At present, she has applied for 21 national invention patents, published 3 academic books and 48 research papers, including 36 SCI and EI. She has won many titles including first prize of China Nonferrous Metals Industry Science and Technology Award, third prize of Yunnan Natural Science Award, and third prize of Yunnan Science and Technology Invention Award, Yunling Industrial Technology Leading Talents, Yunnan Province Young and Middle-aged Technical Innovation Talents of Yunnan Province and Young and Middle-aged Academic and Technical Leaders of Kunming.

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	ZHOU Jianfeng
	ZHAI Xinhua
	ZHANG Panpan
	HE Yapeng
	Dong Jin
	HUANG Hui
	GUO Zhongcheng

Cite this article:

ZHOU Jianfeng,ZHAI Xinhua,ZHANG Panpan, et al. Research Progress on Structural Optimization and Crystal Surface Control of Li-rich Manganese-based Cathode Materials[J]. Materials Reports, 2021, 35(11): 11057-11065.

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http://www.mater-rep.com/EN/10.11896/cldb.20010086 OR http://www.mater-rep.com/EN/Y2021/V35/I11/11057

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