钠离子电池硒化钴负极材料制备方法及改性研究进展

Research progress on preparation and modification of cobalt selenide anode materials for sodium-ion batteries

硒化钴(CoSe_(2))因具有较高的理论容量,被认为是极具潜在价值的钠离子电池(SIBs)负极材料。但CoSe_(2)负极材料在充放电过程中体积膨胀严重且充放电性能差,影响了电池的实际应用。针对CoSe_(2)材料应用于钠离子电池负极中存在的问题,主要从材料晶体结构及储钠机理、制备工艺、改性研究(纳米结构调控、杂原子掺杂、材料复合化)等方面入手,概述了国内外研究学者将CoSe_(2)应用于钠离子电池负极材料的设计研究进展。最后,立足于当下CoSe_(2)负极材料研究现状,阐述了其在某些方面存在的问题,以及仍需努力的方向。

Cobalt selenide(CoSe_(2))is considered a potential anode material for sodium-ion batteries(SIBs)due to its high theoretical capacity.However,CoSe_(2)anode material has serious volume expansion and poor charge-discharge performance during the charge-discharge process,which hinders its practical application in battery.In view of the existing problems in the application of CoSe_(2)material in sodium-ion battery anodes,mainly from the perspectives of the crystal structure,sodium storage mechanism,preparation process,and modification research(nanostructure control,heteroatom doping and material compounding)of CoSe_(2)material,the design and research progress of CoSe_(2)used as an anode material for sodium-ion batteries by domestic and foreign researchers was reviewed.Finally,based on the current research status of CoSe_(2)anode materials,the existing problems in some aspects and the research direction that still needed to be worked on were expounded.