V-Doping-Mediated Li3VO4 Modification to Enhance the Cycling Stability of Li1.2Mn0.6Ni0.2O2

IF 5.4 3区 材料科学 Q2 CHEMISTRY, PHYSICAL ACS Applied Energy Materials Pub Date : 2025-01-23 DOI:10.1021/acsaem.4c0217710.1021/acsaem.4c02177
Mengmeng Yan, Dan Zhang*, Xin Zhang, Xiaoyan Xie, Kai Yao, Caiqi Ma, Xu Zhao, Shilong Fu, Guangshe Li and Liping Li*, 
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Abstract

Lithium-rich manganese layered (LMR) materials, utilizing the characteristics of both cation and anion redox, are promising cathodes for high-energy-density lithium-ion batteries. However, capacity fading and voltage decay pose challenges to their commercial applications. In this work, we employ chemical bonding to integrate Li3VO4 with Li1.2Mn0.6Ni0.2O2, leveraging their compatible properties to form a stable interface and address related challenges. An epitaxially grown Li3VO4 coating on Li1.2Mn0.6Ni0.2O2 crystals enhances stability at the electrode–electrolyte interface while also improving lithium-ion conduction. Additionally, the strong metal–oxygen bonds between the high-valence V element and Li1.2Mn0.6Ni0.2O2 effectively lower the surface oxygen activity, further preventing oxygen release and irreversible phase transitions. In the assembled half-cell tests, 3 wt % Li3VO4-coated Li1.2Mn0.6Ni0.2O2 exhibits excellent electrochemical performance. After 150 cycles at 200 mA g–1, the discharge specific capacity reaches 188 mA h g–1, with a capacity retention rate as high as 93%. Even under a high current density of 1000 mA g–1, the discharge specific capacity remains at 128 mA h g–1 after 200 cycles. This study highlights the significant impact of bonded lattice-matching materials, presenting a viable design strategy for developing high-performance LMR cathodes.

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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
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