Preparation and electrochemical performance of LiF-V2O3 composite cathode for lithium-ion batteries

IF 2.6 4区化学 Q3 CHEMISTRY, PHYSICAL

Ionics Pub Date : 2025-07-23 DOI:10.1007/s11581-025-06542-4

Liping Ning, Zhixing Sui, Anping Tang, Ziqin Liang, Hezhang Chen, Haishen Song, Guorong Xu

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Abstract

Conversion reactions have made LiF-metal oxide (MO) composites with attractive specific capacities compelling candidates for the next generation of lithium-ion battery cathode materials. However, it is necessary for the high charge voltage (> 4.5 V) to drive the redox reaction of MOs and break a strong ionic bond between Li⁺ and F⁻ upon charge. It is a crucial way for decrease in the charge voltage to lower the activation energy barrier of the redox process between LiF and MOs. A novel conversion cathode LiF-V₂O₃ system is proposed in this study. Unlike most of the previously reported LiF-MOs systems, the LiF-V₂O₃ system can work at the lower charge cut off voltage of 4.3 V. It delivers a reversible specific capacity of 197 mAh g⁻¹ at C/20 rate in the voltage range of 2–4.3 V. Cyclic voltammetry data suggest a dominant contribution of pseudocapacitance effect in the conversion reaction of the LiF-V₂O₃ sample.

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锂离子电池用LiF-V2O3复合阴极的制备及其电化学性能

转化反应使得具有诱人比容量的金属氧化物（MO）复合材料成为下一代锂离子电池正极材料的有力候选材料。然而，需要高充电电压（> 4.5 V）来驱动MOs的氧化还原反应，并在充电时破坏Li+和F−之间的强离子键。降低LiF与MOs氧化还原过程的活化能势垒是降低充电电压的重要途径。本研究提出了一种新型的liff - v2o3转换阴极体系。与之前报道的大多数LiF-MOs系统不同，LiF-V2O3系统可以在4.3 V的较低充电截止电压下工作。在2-4.3 V电压范围内，在C/20速率下可提供197 mAh g−1的可逆比容量。循环伏安数据表明，赝电容效应在LiF-V2O3样品的转化反应中起主导作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.