Facile and scalable synthesis of bismuth oxyhalide nanosheets anodes for fast and durable sodium-ion storage  

快充、长寿命钠离子电池卤氧化铋纳米片负极材料的高效规模化合成

作　　者：Shenghui Zhou Zhefei Sun Zilong Zhuang Sifan Wen Haoyu Chen Quanzhi Yin Jianhai Pan Xingqi Chen Jijian Xu Qiaobao Zhang 周生辉;孙哲飞;庄子龙;文思凡;陈浩宇;尹泉智;潘建海;陈星齐;徐吉健;张桥保

机构地区：[1]State Key Laboratory of Physical Chemistry of Solid Surfaces,College of Materials,Xiamen University,Xiamen 361005,China [2]Department of Mechanical Engineering,University of Wisconsin-Madison,Madison,WI 53713,USA [3]Department of Chemistry,City University of Hong Kong,Hong Kong 999077,China [4]Longmen Laboratory,Luoyang 471023,China

出　　处：《Science China Materials》2025年第3期868-878,共11页中国科学(材料科学)(英文版)

基　　金：supported by the National Natural Science Foundation of China(52122211 and 52072323);the Frontier Exploration Projects of Longmen Laboratory(LMQYTSKT008);the Shenzhen Technical Plan Project(JCYJ20220818101003008);the“Double-First Class”Foundation of Materials and Intelligent Manufacturing Discipline at Xiamen University;the support of the Nanqiang Young Top-notch Talent Fellowship at Xiamen University.

摘　　要：Bismuth oxyhalide(BiOCl)holds promising potential as the anode for sodium-ion batteries(SIBs)due to its high theoretical capacity and unique layered structure.However,its practical applications are hindered by challenges such as large volume variations during cycling,the ambiguous Na^(+)-storage mechanism,and complex synthesis methods.Here,we present a facile and scalable strategy to fabricate a high-performance BiOCl nanosheets anode for SIBs.Through comprehensive in-situ and ex-situ microscopic characterizations and electrochemical analysis,we reveal that the sodiation/desodiation process of the BiOCl nanosheets anode leads to the formation of metallic Bi and Na_(3)OCl.The metallic Bi acts as an active material for Na^(+)storage in subsequent cycles,while the formed Na_(3)OCl enhances the stability of the solidelectrolyte interphase(SEI)layer and facilitates Na^(+)transport.Additionally,the metallic Bi gradually transforms into a nanoporous structure during cycling,improving Na^(+)transport and mitigating volume variations.As a result,the BiOCl nanosheets anode exhibits outstanding electrochemical performance,with impressive rate capability and cycling stability.Furthermore,full cells paired with the Na_(3)V_(2)(PO_(4))_(3)(NVP)cathode and pre-cycled BiOCl nanosheets anode also demonstrate a superior rate and cycling performance.This work offers valuable insight into the development of highperformance anodes for advanced SIBs.卤氧化铋(BiOCl)因具有较高的理论比容量和独特的层状结构,是一种有潜力的高性能钠离子电池(SIBs)负极材料.然而,其面临储钠过程中体积膨胀大、储钠机制不明和材料合成方法复杂等诸多挑战,严重制约了其实际应用.基于此,本文提出了一种简便高效的合成策略成功构筑了高性能储钠BiOCl纳米片负极材料.通过深入的原位/非原位显微和谱学表征技术结合电化学分析,我们证实了BiOCl纳米片负极在嵌/脱钠循环后,生成了金属Bi和Na_(3)OCl.所形成的金属Bi在后续的循环过程中作为储钠的活性物质,而形成的Na_(3)OCl有利于增强固体电解质中间相(SEI)的稳定性和促进钠离子的快速传输.此外,形成的金属Bi在循环过程中逐渐转变为纳米多孔结构,进一步提高钠离子的传输效率和缓冲材料的体积膨胀.因此,制备得到的BiOCl纳米片负极展现出了优异的倍率性能和循环稳定性.由预钠循环后的BiOCl纳米片负极与磷酸钒钠(NVP)正极匹配组装的全电池,也表现出了优异的倍率和循环性能.这项工作为开发高性能的钠离子电池负极提供了有价值的见解.

关 键 词：bismuth oxyhalide ANODE sodium-ion batteries electrochemical performance 

分 类 号：O64[理学—物理化学]