Improved lithium-ion battery cathode rate performance via carbon black functionalization,Journal of Materials Chemistry A

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Improved lithium-ion battery cathode rate performance via carbon black functionalization
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-01-24 , DOI: 10.1039/d3ta05093a
Donghyuck Park ₁ , Peter C. Sherrell _{1,

2} , Fangxi Xie _{1,

3} , Amanda V. Ellis ₁

Affiliation

Carbon black (CB) creates essential electron transport pathways in lithium-ion battery (LiB) cathodes. Here, we show that by modifying the surface of CB via mild hydrogen peroxide or nitric acid treatment, the rate performance of a LiB cathode can be increased up to 350% at 0.75 C-rate charging. We demonstrate that this improvement is predominately due to the presence of introduced carbonyl groups on the surface of the CB which increases the surface redox reaction of the nickel manganese cobalt oxide (NMC) cathode active material. As a result, there is both a decrease in the overpotential (∼37% during 0.25 C-rate charging) and electrochemical impedance. A mechanism is proposed which describes how the cathode performance is influenced by electrostatic interactions between the CB surface and solvated lithium ions. An improved rate effect was demonstrated across various cathode active materials, clearly highlighting the versatility of this simple approach.

中文翻译：

通过炭黑功能化提高锂离子电池正极倍率性能

炭黑 (CB) 在锂离子电池 (LiB) 阴极中创建重要的电子传输路径。在这里，我们表明，通过温和的过氧化氢或硝酸处理对CB 表面进行改性，LiB 正极的倍率性能在 0.75 C 倍率充电时可提高高达 350%。我们证明，这种改进主要是由于CB表面引入的羰基的存在，这增加了镍锰钴氧化物（NMC）正极活性材料的表面氧化还原反应。结果，过电位（0.25 C 速率充电期间约 37%）和电化学阻抗均下降。提出了一种机制，描述了阴极性能如何受到CB表面和溶剂化锂离子之间的静电相互作用的影响。各种正极活性材料都表现出了改进的倍率效应，清楚地突出了这种简单方法的多功能性。

更新日期：2024-01-24

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