Controlled WS_(2) crystallinity effectively dominating sodium storage performance

作     者：Xiaomin Luo Jianfeng Huang Jiayin Li Liyun Cao Yong Wang Zhanwei Xu Ling Guo Yayi Cheng Koji Kajiyoshi Shaoyi Chen Xiaomin Luo;Jianfeng Huang;Jiayin Li;Liyun Cao;Yong Wang;Zhanwei Xu;Ling Guo;Yayi Cheng;Koji Kajiyoshi;Shaoyi Chen

作者机构：School of Materials Science and EngineeringShaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi'an 710021ShaanxiChina Kochi UniversityResearch Laboratory of Hydrothermal ChemistryKochi 780-8520Japan Dingxin Cells Co.Ltd.Nantong 226600JiangsuChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第12期

页      面：143-153页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 07[理学] 0817[工学-化学工程与技术] 08[工学] 070205[理学-凝聚态物理] 0807[工学-动力工程及工程热物理] 080501[工学-材料物理与化学] 0827[工学-核科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 21701107, 51672165, and 51472152) the China Postdoctoral Science Foundation (No. 2016M592897XB) Technology and Natural Science Foundation of Shaanxi (No. 2018JQ5107) Key Program for International S&T Cooperation Projects of Shaanxi Province Xi’an Key Laboratory of green manufacture of ceramic materials Foundation No. 2019220214SYS017CG039 China Graduate Innovation Fund of Shaanxi University of Science and Technology 

主　　题：WS_(2) Crystallinity Intercalation reaction Degree of interlayer order Interlayer force 

摘      要：WS2 exhibits tremendous potentials for Na-ions storage owing to high capacity(433 mAh g^(-1)). Nevertheless, WS2 layered structure is often exfoliated with rapid capacity decay and sluggish reaction *** this work, WS2 nanosheets with different crystallinities are controlled by different synthesis *** high crystallinity WS2 exhibits high degree of interlayer order and strong interlayer force. It exhibits superior electrochemical properties, at the current density of 200 mA g^(-1) after 300 cycles with reversible capacity of 471 mAh g^(-1). Even at 5.0 A g^(-1), the capacities can still arrive at 240 mAh g^(-1) after 250 cycles, exhibiting stable cycling performance. Further electrochemical research finds that the high degree of interlayer order of layered WS2 structure can perform highly conducive Na+insertion/extraction with greatly improved contribution of intercalation capacity. Moreover, the strong interlayer force can effectively restrain the exfoliating of the WS2 nanosheets, guaranteeing the stability of the structure. Combining the above result reveals that controlling the order and force of the interlayer is an effective way to enhance the electrochemical properties of WS2 as SIBs anode materials. This work can provide new insight for inhibiting the exfoliation of layered compounds to pursue excellent electrochemical performance in Na-ion storage systems.