Improvement of electrochemical performance by surface modification of LiNi0.65Co0.15Mn0.2O2 cathode materials with SnO2

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2024-11-05 DOI:10.1016/j.colsurfa.2024.135719

Fu Yang, Yan-Ming Jia, Zhi-Yan Bai, Li-Juan Sun, Yu-Long Xie

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引用次数: 0

Abstract

LiNi_0.65Co_0.15Mn_0.2O₂ batteries have attracted more and more attention due to their high energy density. However, LiNi_0.65Co_0.15Mn_0.2O₂ possesses adverse factors such as severe Li-Ni mixing and side reactions between active substance and electrolyte, which limits its electrochemical performance. Hence, we employed the SnO₂ surface coating method to enhance its performance. SnO₂ coating inhibits the direct contact between LiNi_0.65Co_0.15Mn_0.2O₂ and the electrolyte, which reduces the lithium-nickel mixing, enlarges the lithium layer spacing, and contributes to the improvement of the specific capacity of discharge and the cycling performance. The electrochemical results indicate the optimal SnO₂-coated LiNi_0.65Co_0.15Mn_0.2O₂ show excellent cycling performance (85.0 % capacity retention for 100 cycles at 0.1 C) and multiplicative performance (124.1 mA·h·g⁻¹ discharge specific capacity at 2 C). The paper highlights the SnO₂ cladding technology which provides an excellent research idea to improve lithium-ion batteries.

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用二氧化锡对 LiNi0.65Co0.15Mn0.2O2 阴极材料进行表面改性以提高其电化学性能

LiNi0.65Co0.15Mn0.2O2 电池因其能量密度高而受到越来越多的关注。然而，LiNi0.65Co0.15Mn0.2O2 存在严重的锂镍混合和活性物质与电解质之间的副反应等不利因素，限制了其电化学性能。因此，我们采用了二氧化锡表面镀膜的方法来提高其性能。SnO2 涂层抑制了 LiNi0.65Co0.15Mn0.2O2 与电解液的直接接触，减少了锂镍混合，扩大了锂层间距，有助于提高放电比容量和循环性能。电化学结果表明，最佳的 SnO2 涂层 LiNi0.65Co0.15Mn0.2O2 具有优异的循环性能（0.1 C 条件下 100 次循环容量保持率为 85.0%）和倍增性能（2 C 条件下放电比容量为 124.1 mA-h-g-1）。论文强调了二氧化锰包层技术，为改进锂离子电池提供了一个极好的研究思路。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.