Interlayer gap widened TiS_(2) for highly efficient sodium-ion storage

作     者：Chengcheng Huang Yiwen Liu Runtian Zheng Zhengwei Yang Zhonghao Miao Junwei Zhang Xinhao Cai Haoxiang Yu Liyuan Zhang Jie Shu Chengcheng Huang;Yiwen Liu;Runtian Zheng;Zhengwei Yang;Zhonghao Miao;Junwei Zhang;Xinhao Cai;Haoxiang Yu;Liyuan Zhang;Jie Shu

作者机构：School of Materials Science and Chemical EngineeringNingbo UniversityNingbo 315211China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第107卷第12期

页      面：64-69页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：sponsored by NSAF joint Fund(U1830106) Science and Technology Innovation 2025 Major Program of Ningbo(2018B10061) National Natural Science Foundation of China(U1632114,51901205) K.C.Wong Magna Fund in Ningbo University。 

主　　题：Pre-potassiation TiS_(2) Expanded interlayer gap Anode material Sodium-ion batteries 

摘      要：As an alternative for lithium-ion batteries(LIBs),sodium-ion batteries(SIBs)have lately received tremendous interest due to their abundant reserves as well as low cost.Nevertheless,the lack of suitable anode materials severely hinders the application of sodium-ion batteries.TiS_(2)is elected as a representative material owing to its unique layered structure.But it always suffers from capacity fade due to poor electrochemical kinetics and structural stability.In this work,we fabricate a pre-potassiated TiS_(2)as a host material for sodium storage by an electrochemical pre-potassiation strategy.The intercalation/extraction mechanism,structural changes and reaction kinetics are completely investigated to reveal the outstanding electrochemical property of pre-potassiated TiS_(2)electrode.It turns out that the large interlayer space of pre-potassiated TiS_(2)is conducive to the diffusion of sodium ions,inducing the reduction of entropic barrier for the electrochemical reactions.In addition,the pre-potassiated host structure is still firmly maintained upon repeated cycles.Therefore,the pre-potassiated TiS_(2)presents superior rate capability(165.9 mA h g^(−1) at 1 C and 132.1 mA h g^(−1) at 20 C)and long-term cycling stability(85.3%capacity retention at 5 C after 500 cycles)for SIBs.This research provides an avenue to construct long-life sodium energy storage systems based on pre-potassiated TiS_(2).