Vanadium Doping for Enhanced Electrochemical Performance of the High-Voltage LiCu0.5Mn1.5O4 Cathode

IF 3.8 3区工程技术 Q2 ENGINEERING, CHEMICAL

Industrial & Engineering Chemistry Research Pub Date : 2025-05-23 DOI:10.1021/acs.iecr.5c00828

Shang Gao, Haipeng You, Weicheng Xia, Feng Su, Xin Dou, Zheng Bai, Long Chen, Chunzhong Li

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Abstract

Lithium-ion batteries are widely used in electric vehicles and energy storage systems. Among various cathode materials, spinel-type LiCu_0.5Mn_1.5O₄ stands out for its high voltage (5 V), low cost, and excellent safety. However, its practical application is constrained by limited discharge capacity (<70 mAh/g) and poor cycling stability. In this study, vanadium doping reduced the oxidation state of manganese, significantly enhancing the specific capacity while stabilizing the crystal structure. As a result, the initial discharge capacity increased to 95.2 mAh/g, a 38.2% increase over the undoped material, and exhibited excellent cycling stability─retaining 91.1% of its capacity after 900 cycles at 2 C and 83.4% after 1500 cycles at 5 C. Even under high-temperature conditions (55 °C), it maintained 82.8% of its capacity after 150 cycles. This work provides valuable theoretical insights for advancing LiCu_0.5Mn_1.5O₄ as a high-performance cathode material.

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钒掺杂提高高压LiCu0.5Mn1.5O4阴极电化学性能

锂离子电池广泛应用于电动汽车和储能系统。在各种正极材料中，尖晶石型LiCu0.5Mn1.5O4以其高电压（5 V）、低成本和优异的安全性而脱颖而出。但其实际应用受到放电容量有限（<70 mAh/g）和循环稳定性差的制约。在本研究中，钒的掺杂降低了锰的氧化态，在稳定晶体结构的同时显著提高了比容量。结果表明，该材料的初始放电容量增加到95.2 mAh/g，比未掺杂的材料增加了38.2%，并且表现出优异的循环稳定性，在2℃下循环900次后保持了91.1%的容量，在5℃下循环1500次后保持了83.4%的容量，即使在高温条件下（55℃），循环150次后仍保持了82.8%的容量。这项工作为推进LiCu0.5Mn1.5O4作为高性能正极材料提供了有价值的理论见解。

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来源期刊

Industrial & Engineering Chemistry Research 工程技术-工程：化工

CiteScore

7.40

自引率

7.10%

发文量

1467

审稿时长

2.8 months

期刊介绍： ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.