用于储锂电池的三维碳结构集流体

Three-dimensional carbon based current collectors for lithium-based batteries

三维碳结构材料具有轻质、优异的热学和电学性质,良好的机械性能和电化学稳定性等特点,用作电化学储能器件的集流体能够优化电极材料层中的导电网络同时缓解体积膨胀,实现电极能量密度、功率密度和循环稳定性的同时提升,在电化学储能领域展现出了巨大的应用潜力.本文结合本课题组在碳材料方面的部分研究工作,概述了当前三维碳结构集流体在锂离子电池中的最新研究进展.根据三维网络结构基元之间的连接方式,从共价键组装和非共价键组装的三维碳网络两个方面进行了分类总结,并对碳集流体在锂离子电池中存在的问题及发展方向进行了阐述,从而为进一步设计和优化新型的三维碳结构集流体提供新思路.

Three-dimensional carbon materials combining excellent mechanical, electrical and thermal properties with very good electrochemical resistance have shown great potential for electrochemical energy storage. Building up a three- dimensional current collector can simultaneously optimize the conductive network in the electrochemically active layers and mitigate the volume change at the electrode level during cycling, which leads to enhanced energy density, power density and cycle stability. This review aims to provide an overview of the recent key progress on 3D carbon current collector for Li-ion batteries. According to the type of the connections at the junctions between the nano/micro-scale constituents, we categorize 3D carbon materials into two aspects： 3D carbon networks based on covalent connection and 3D carbon networks based on non-covalent connection. The requirements and the challenges of the 3D carbon based current collector＇s design are discussed, which provide inspiration for further exploitation of the current collectors for Li-ion batteries and shed light on batteries based on other electrochemistry.