A novel Na_(8)Fe_(5)(SO_(4))_(9)@rGO cathode material with high rate capability and ultra-long lifespan for low-cost sodium-ion batteries

作     者：Changyu Liu Kean Chen Huiqian Xiong Along Zhao Haiyan Zhang Qingyu Li Xinping Ai Hanxi Yang Yongjin Fang Yuliang Cao 

作者机构：Hubei Key Laboratory of Electrochemical Power SourcesCollege of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072China Guangdong Engineering Laboratory of Energy Storage Materials and DevicesSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Guangxi Key Laboratory of Low Carbon Energy MaterialsSchool of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China 

出 版 物：《eScience》 (电化学与能源科学（英文）)

年 卷 期：2024年第4卷第1期

页      面：96-103页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：support from the National Nature Science Foundation of China(Nos.U20A20249 21972108 and 22209125) 

主　　题：Na_(8)Fe_(5)(SO_(4))_(9) Phase-pure Density functional theory Cathode materials Sodium-ion batteries 

摘      要：Sodium-ion batteries(SIBs)are regarded as the most promising technology for large-scale energy storage ***,the practical application of SIBs is still hindered by the lack of applicable cathode ***,a novel phase-pure polyanionic Na_(8)Fe_(5)(SO_(4))_(9) is designed and employed as a cathode material for SIBs for the first *** Na_(8)Fe_(5)(SO_(4))_(9) has an alluaudite-type sulfate framework and small Naþion diffusion *** expected,the as-synthesized Na_(8)Fe_(5)(SO_(4))_(9)@rGO exhibits a high working potential of 3.8 V(versus Na/Naþ),a superior reversible capacity of 100.2 mAh g1 at 0.2 C,excellent rate performance(~80 mAh g1 at 10 C,~63 mAh g1 at 50 C),and an ultra-long cycling life(91.9%capacity retention after 10,000 cycles at 10 C,81%capacity retention after 20,000 cycles at 50 C).We use various techniques and computational methods to comprehensively investigate the electrochemical reaction mechanisms of Na_(8)Fe_(5)(SO_(4))_(9)@rGO.