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Inspired by nature:Self-fractal cobalt sulfate composite electrode for sodium ion storage

查看全文 作　　者：Man [1]Zhang;Xiaoxu [1]Liu;Jjiangdong [1]Gu;Hui [2]Wang;Hui [1]Liu;Zexiang [2]Shen 高影响力作者 机构地区：[1]Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,School of Material Science and Engineering,Shaanxi University of Scienceand Technology,Xi'an710021,China;[2]Division of Physics and Applied Physics School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore 637371,Singapore高影响力机构 出　　处：《Chinese Chemical Letters》索引2023年第34卷第12期,共6页高影响力期刊 基　　金：supported by Beijing Synchrotron Radiation 1W2A Work Station and 4B9A Work Station in China and was financially supported by National Natural Science Foundation of China(No.52250710161). 摘　　要：Generally,the metal sulfide itself has poor conductivity,and the volume expansion occurs when it is converted with sodium,which will destroy the integrity of the electrode structure,resulting in poor cycle performance and rate performance.To solve the problems of low initial coulombic efficiency(ICE)and volume expansion of metal compounds used as anodes in sodium-ion batteries(SIBs).Inspired by nature,the CoSO_(4)/hard carbon/graphene(CHG)fractal structure electrode was designed.Self-fractal structures with electron/ion transport channels and high strain tolerance proved to be an effective strategy to overcome these challenges.The fractal dimension(D)is measured by synchronous Small Angle X-ray scattering,and the D remains stable during charging and discharging.The fractal CHG also showed excellent electrochemical performance,especially 97.4%ICE.Theoretical calculation shows that self-fractal CHG can promote the formation of a thin solid electrolyte interface(SEI).Synchrotron radiation absorption spectrum proved the reaction mechanism of CHG.This study not only proves that cobalt sulfate is a feasible strategy for developing high-performance SIBs anodes but also provides an advanced method for measuring the fractal dimension of energy storage electrode materials. 关 键 词：Fractal structure Cobalt sulfate SAXS Sodium-ion battery Anode material
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