Ni-La双掺LiMn<sub>2</sub>O<sub>4</sub>截角八面体正极材料的制备及电化学性能

doi:10.11896/cldb.21120089

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Abstract The truncated octahedral LiNi_0.05La_0.04Mn_1.91O₄ cathode material with {111} and {100} crystal planes was prepared by a solution combustion method. The results show that the Ni-La co-doping promoted the preferential growth of {111} and {100} planes of spinel LiMn₂O₄ crystals, forming a cathode material with sub-micron truncated octahedral grain morphology. At 1C, the first discharge specific capacity was 128.5 mA·h/g, and the retention rate after 1 000 cycles was 65.48%; at 10C rate, the discharge specific capacity was 108.2 mA·h/g, and the capacity retention rate after 1 500 cycles was 75.8%; at higher rates of 15C and 20C, the retention rates after 2 000 long cycles were 74.76% and 76.16%, respectively, indicating that the higher the charge-discharge rate of LiNi_0.05La_0.04Mn_1.91O₄ material, the better the capacity retention rate. The material has a larger lithium-ion diffusion coefficient and a smaller apparent activation energy. The combined control strategy of Ni-La co-doping and truncated octahedral morphology can effectively suppress Jahn-Teller distortion, reduce Mn dissolution, and increase the number of Li⁺ migration channels, stabilize the crystal structure, and increase the rate performance and cycle life of spinel LiMn₂O₄ cathode material.

Key words： LiMn₂O₄ Ni-La co-doping truncated octahedron Jahn-Teller distortion Mn dissolution cathode material lithium-ion battery

Published: 25 July 2023 Online: 2023-07-24

CLC number:

TM912

Fund:National Natural Science Foundation of China (51972282).

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	LI Yan
	ZHANG Junjie
	GUO Junming

Cite this article:

LI Yan,ZHANG Junjie,GUO Junming. Preparation and Electrochemical Performance of Ni-La Double-doped LiMn₂O₄ Truncated Octahedral Cathode Material[J]. Materials Reports, 2023, 37(14): 21120089-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21120089 OR http://www.mater-rep.com/EN/Y2023/V37/I14/21120089

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