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

doi:10.19799/j.cnki.2095-4239.2024.1122

Abstract

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

CLC Number:

TM 911

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.

Figures/Tables 5

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

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