快速充电锂离子电池LiEuTiO4负极材料研究进展

Progress of LiEuTiO4 for Anode Materials in Lithium-ion Batteries with Fast Charging

摘要:

随着电动车产业的快速发展,锂离子电池的安全问题和快速充电问题越来越受到关注。石墨作为商业化已久的锂离电池负极材料,因其析锂平台近乎于零,而存在因负极析锂而短路的巨大安全隐患,因而不适用于快速充电的锂离子电池负极材料。具有层状钙钛矿结构LiEuTiO₄,其脱/嵌锂平台约为0.8V,实际比容量高于200 mAh/g,既可以避免析锂的发生, 又不会导致电池能量密度过低,且倍率性能良好,利用该材料有望发展出一种电动车用安全的快速充电动力电池。本工作总结了钛酸铕锂(LiEuTiO₄)负极材料的研究现状,包括分子结构、储锂机制、制备方法及亟待解决的问题,指出进一步的研究方向。

Abstract:

With the rapid development of electric vehicle industry, the safety and fast charging of lithium ion batteries have attracted more and more attention. Graphite, as commercial anode material for lithium-ion batteries, has a great potential safety hazard of internal short-circuit caused by the lithium plating due to the low intercalationSpotential (~0 V), and is not suitable for fast charging batteries. LiEuTiO₄ with a layered perovskite structure has intercalationSpotential of about 0.8 V and actual capacity of over 200 mAh/g, which can avoid the occurrence of lithium plating and will keep high energy density and rate performance, thus hopefully become the ideal anode for safe fast-charging power battery for electric vehicles. In this paper, the current research status of LiEuTiO₄ is summarized, including molecular structure, lithium-storage mechanism, preparation method and problems to be solved, etc.