Electrostatic Dual-Layer Solvent-Free Cathodes for High-Performance Lithium-Ion Batteries

IF 3.9 4区工程技术 Q3 ENERGY & FUELS

Energies Pub Date : 2025-06-12 DOI:10.3390/en18123112

Hang Guo, Chengrui Zhang, Yujie Ma, Ning Liu, Zhifeng Wang

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引用次数: 1

Abstract

Slurry-cast (SLC) electrode manufacturing faces problems such as thickness limitation and material stratification, which are caused by applying toxic organic solvents. Solvent-free electrode technology, as a sustainable alternative, could get rid of issues generated by solvents. In this study, dual-layer NCM811 solvent-free electrodes (DLEs) are fabricated via an electrostatic powder deposition method with an active material-rich upper layer to provide high energy output, while the more binder–conductor content base layer improves conductivity and contact with current collectors. The dual-layered structure overwhelms the single-layer electrode (SE) with stable cycling performance caused by more regulated pore structures. DLE maintains 74% capacity retention after 100 cycles at 0.3 C, while the SLC shows only 60% capacity retention. Additionally, DLE shows excellent rate performance at various rates, with 207.3 mAh g−1, 193.9 mAh g−1, 173.9 mAh g−1, 157.3 mAh g−1, and 120.4 mAh g−1 at 0.1 C, 0.2 C, 0.5 C, 1.0 C, and 2.0 C, respectively. The well-designed DLE cathodes exhibit superior discharge-specific capacities, rate performance, and improved cycling stability than traditional SLC cathodes. It enlightens the path toward new structure innovations of solvent-free electrodes.

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高性能锂离子电池静电双层无溶剂阴极

由于使用有毒的有机溶剂，浆料铸电极制造面临着厚度限制和材料分层等问题。无溶剂电极技术作为一种可持续的替代技术，可以解决溶剂产生的问题。在本研究中，通过静电粉末沉积方法制备了双层NCM811无溶剂电极（les），其上层富含活性材料以提供高能量输出，而更多的粘合剂-导体含量的基层提高了导电性和与集流器的接触。由于孔隙结构更受调控，双层结构的循环性能优于单层电极。在0.3℃下，经过100次循环后，DLE的容量保留率为74%，而SLC的容量保留率仅为60%。此外，DLE在不同的倍率下表现出优异的倍率性能，分别在0.1 C、0.2 C、0.5 C、1.0 C和2.0 C下的倍率分别为207.3 mAh g−1、193.9 mAh g−1、173.9 mAh g−1、157.3 mAh g−1和120.4 mAh g−1。与传统的SLC阴极相比，设计良好的DLE阴极具有优越的放电比容量、倍率性能和更好的循环稳定性。这为无溶剂电极的结构创新指明了方向。

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

Energies ENERGY & FUELS-

CiteScore

6.20

自引率

21.90%

发文量

8045

审稿时长

1.9 months

期刊介绍： Energies (ISSN 1996-1073) is an open access journal of related scientific research, technology development and policy and management studies. It publishes reviews, regular research papers, and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.