Strategies for designing high-performance hard carbon anodes with enhanced lithium-ion diffusion and rate capability

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2024-11-04 DOI:10.1016/j.matlet.2024.137663

Fuliang Liu , Xiaoshuang Luo , Xiong Zhou , Yin Shen , Junchen Chen , Xing Li , Xiaogang Zhang

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Abstract

The performance of the electrodes is closely related to the structure of the electrode sheet, and the construction of advanced electrodes is crucial for the lithium-ion diffusion process in high-performance lithium-ion batteries (LIBs). Hard carbon, with its irregular polycrystalline microstructure, is an ideal candidate material for the anode electrode of LIBs. However, its have some drawbacks such as low initial coulombic efficiency (ICE), low capacity and poor rate performance. In this work, two electrode casting approaches are proposed and tested in pouch cells, which are double-layer blade coated electrode and patterned coated electrode. The results show that both coating methods show a combination of high ICE and rate capability, exceeding the performance of conventional single-coated electrodes composed of the same material. The designed coating method improves the dynamics of lithium ion diffusion process in the electrode, and the magnification performance and comprehensive electrochemical performance are improved. The research has a wide application prospect and can provide design guidance for obtaining high-power batteries.

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设计具有更强锂离子扩散和速率能力的高性能硬碳阳极的策略

电极的性能与电极片的结构密切相关，而先进电极的构造对于高性能锂离子电池（LIB）中的锂离子扩散过程至关重要。硬碳具有不规则的多晶微结构，是锂离子电池阳极电极的理想候选材料。然而，它也有一些缺点，如初始库仑效率（ICE）低、容量小和速率性能差。本研究提出了两种电极铸造方法，并在袋式电池中进行了测试，即双层刀片涂层电极和图案涂层电极。结果表明，这两种涂覆方法都具有较高的 ICE 和速率能力，超过了由相同材料组成的传统单涂覆电极的性能。所设计的涂覆方法改善了电极中锂离子扩散过程的动态性，提高了放大性能和综合电化学性能。该研究具有广阔的应用前景，可为获得高功率电池提供设计指导。

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

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive