MoS2 尖晶石包覆富锂锰基正极材料的电化学性能

doi:10.19799/j.cnki.2095-4239.2024.1122

储能科学与技术 ›› 2025, Vol. 14 ›› Issue (3): 1087-1096.doi: 10.19799/j.cnki.2095-4239.2024.1122

MoS₂ 尖晶石包覆富锂锰基正极材料的电化学性能

周德清¹(), 蔡艺嘉², 张子芩², 周丽萍¹, 胡思江²(), 黄有国², 王红强², 李庆余²

^1.安徽益佳通电池有限公司，安徽宣城 242000
^2.广西师范大学化学与药学学院广西低碳能源材料重点实验室，广西桂林 541000

收稿日期:2024-11-27 修回日期:2024-12-28 出版日期:2025-03-28 发布日期:2025-04-28
通讯作者: 胡思江 E-mail:66194391@qq.com;sjhu@gxnu.edu.cn
作者简介:周德清（1970—），男，本科，工程师，主要研究方向为新型储能，E-mail：66194391@qq.com；
基金资助:
广西自然科学基金杰出青年基金项目(2024GXNSFFA010003)

Electrochemical properties of spinel MoS₂ coated lithium-rich manganese-based cathode materials

Deqing ZHOU¹(), Yijia CAI², Ziqin ZHANG², Liping ZHOU¹, Sijiang HU²(), Youguo HUANG², Hongqiang WANG², Qingyu LI²

^1.AnHui EIKTO Battery Company Limited, Xuancheng 242000, Anhui, China
^2.Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541000, Guangxi, China

Received:2024-11-27 Revised:2024-12-28 Online:2025-03-28 Published:2025-04-28
Contact: Sijiang HU E-mail:66194391@qq.com;sjhu@gxnu.edu.cn

摘要/Abstract

摘要：

富锂锰基层状氧化物比容量较高，是发展高能量密度锂离子电池的理想正极材料。然而，在充放电过程中，富锂锰基正极材料存在过渡金属离子迁移和晶格中氧的不可逆反应等问题，导致电极材料低的首次库仑效率、严重的电压衰减和较差的循环稳定性，这些缺点制约了其产业化应用。针对这些问题，采用表面包覆的方法对材料进行改性，在Li_1.2Ni_0.167Co_0.167Mn_0.666O₂(LLO)材料表面包覆MoS₂，同时引发了次表面结构的转变。结果表明，MoS₂(MS)包覆层能防止材料本体直接暴露在电解液中，有效抑制了界面副反应。三维结构的尖晶石相提高了Li⁺的扩散速率。在0.1C倍率下，改性材料的首次库仑效率均大于88%。与未改性材料相比，质量分数1%的MoS₂包覆量样品LLO@MS1在1.0C倍率下的循环稳定性得到显著提升。在5.0C和10.0C下的放电比容量分别达到160.0 mAh/g和129.0 mAh/g，表明该改性策略提升了材料的综合电化学性能。

关键词: 锂离子电池, 富锂锰基, 包覆改性, 尖晶石相, 次表面结构

Abstract:

Li-rich manganese layered oxides exhibit high specific capacity and serve as an optimal cathode material for high-energy-density lithium batteries. However, during charging and discharging, the Li-rich manganese layered oxides cathode materials experience transition metal migration and irreversible oxygen reactions within the lattice. This results in low coulombic efficiency during the first cycle, severe voltage degradation, and poor cycling stability, collectively constraining industrial application. To address these issues, this paper employs surface coating to modify the materials. A MoS₂ coating was applied to the surface of the Li_1.2Ni_0.167Co_0.167Mn_0.666O₂ (LLO) material, inducing a transformation in the subsurface structure. The findings demonstrate that the MoS₂ coating layer shields the material from direct exposure to the electrolyte and effectively inhibits interfacial side reactions. The three-dimensional structure of the spinel phase facilitates lithium-ion diffusion. The modified materials exhibit initial coulombic efficiencies exceeding 88% at a current density of 0.1C. The cycling stability of LLO@MS1 (mass fraction 1% MS₂ coating) was markedly enhanced relative to that of the unmodified materials when subjected to a current density of 1.0C. The specific discharge capacities reached 160.0 mAh/g and 129.0 mAh/g at 5.0C and 10.0C, respectively, indicating that the modification strategy enhanced overall electrochemical performance.

Key words: lithium battery, Li-rich manganese layered oxides, coating modification, spinel phase, subsurface structure

中图分类号:

TM 911

周德清, 蔡艺嘉, 张子芩, 周丽萍, 胡思江, 黄有国, 王红强, 李庆余. MoS₂ 尖晶石包覆富锂锰基正极材料的电化学性能[J]. 储能科学与技术, 2025, 14(3): 1087-1096.

Deqing ZHOU, Yijia CAI, Ziqin ZHANG, Liping ZHOU, Sijiang HU, Youguo HUANG, Hongqiang WANG, Qingyu LI. Electrochemical properties of spinel MoS₂ coated lithium-rich manganese-based cathode materials[J]. Energy Storage Science and Technology, 2025, 14(3): 1087-1096.

图/表 5

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图5

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MoS₂ 尖晶石包覆富锂锰基正极材料的电化学性能

Electrochemical properties of spinel MoS₂ coated lithium-rich manganese-based cathode materials

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