碳基集流体材料在钠金属负极中的应用

Carbon-based current collector materials for sodium metal anodes

  • 摘要: 室温钠离子二次电池是锂离子二次电池最有可能的替代品,也被认为是大规模能量存储技术的最有前景的选择之一。金属钠具有超高的理论容量以及低的氧化还原电位,因此被认为是最有前景的高比能钠离子电池的负极材料。然而,钠金属负极的应用仍面临一些挑战性,如钠枝晶的生长、钠金属与电解液之间的副反应、充放电过程中大的体积膨胀等。其中,钠枝晶生长不仅可以产生“死”钠和加速钠金属与电解液之间的副反应,导致容量的快速衰减,而且可能刺穿隔膜,引发电解液燃烧、电池爆炸等严重的安全问题。炭材料家族成员众多,可具有高机械强度、轻质量、高导电性、大比表面积和良好的化学稳定性等特性,近年来被广泛报道用于钠金属负极的集流体的研究。本文综述了最新的碳基集流体材料在钠金属负极上的研究进展,分析了碳基集流体的界面、结构与钠金属负极性能之间的关系,最后并对碳基集流体的未来研究面临的问题进行了展望。

     

    Abstract: Room temperature sodium-ion batteries are the most likely alternative to lithium-ion batteries, and are considered one of the most promising candidates for large-scale energy storage. On the anode side, metallic sodium, with an ultra-high theoretical capacity and a low redox potential, has been considered the most promising material for batteries with a high energy density. However, the use of a sodium metal anode has met some challenging problems, such as the growth of sodium dendrites, side reactions between sodium metal and the electrolyte, and large volume changes during charge and discharge. Among them, the growth of sodium dendrites not only produces "dead" sodium and accelerates side reactions, leading to a rapid capacity decay, but the dendrites may also pierce the separators, causing serious safety problems such as fire and battery explosion. Carbon-based materials are a large family, with a high mechanical strength, low density, high conductivity, large specific surface area and good chemical stability. In recent years, they have been widely used as the current collectors for Na metal anodes. This article reviews recent research progress on carbon-based current collector materials for sodium metal anodes, analyzes the relationship between their interface and structure, and the performance of the sodium metal anodes. Finally, problems faced by future research on carbon-based current collectors are discussed.

     

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