From Micropores to Ultra-micropores inside Hard Carbon: Toward Enhanced Capacity in Room-/ Low-Temperature Sodium-Ion Storage

作     者：Jinlin Yang Xiaowei Wang Wenrui Dai Xu Lian Xinhang Cui Weichao Zhang Kexin Zhang Ming Lin Ruqiang Zou Kian Ping Loh Quan-Hong Yang Wei Chen Jinlin Yang;Xiaowei Wang;Wenrui Dai;Xu Lian;Xinhang Cui;Weichao Zhang;Kexin Zhang;Ming Lin;Ruqiang Zou;Kian Ping Loh;Quan-Hong Yang;Wei Chen

作者机构：Joint School of National University of Singapore and Tianjin UniversityInternational Campus of Tianjin UniversityBinhai New CityFuzhou 350207People’s Republic of China Department of ChemistryNational University of Singapore3 Science Drive 3Singapore 117543Singapore National University of Singapore(Suzhou)Research Institute377 Lin Quan StreetSuzhou Industrial ParkSuzhou 215123JiangsuChina Department of PhysicsNational University of Singapore2 Science Drive 3Singapore 117542Singapore Nanoyang GroupState Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350People’s Republic of China Beijing Key Laboratory for Theory and Technology of Advanced Battery MaterialsDepartment of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871People’s Republic of China Institute of Materials Research and Engineering(IMRE)Agency of ScienceTechnologyand Research(A*STAR)3 Research LinkSingapore 117602Singapore 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2021年第13卷第6期

页      面：297-310页

核心收录：

学科分类：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] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Singapore MOE Tier Ⅱ grant R143-000-A29-112 the National Research Foundation under the Grant of NRF2017NRF-NSFC001-007. 

主　　题：Carbon anode Ultra-micropores Extra sodium-ion storage sites Low-voltage capacity High areal capacity 

摘      要：Pore structure of hard carbon has a fundamental influence on the electrochemical properties in sodium-ion batteries(SIBs).Ultra-micropores(1 nm)inside carbon into ultra-micropores(0.5 nm).Consequently,the designed carbon anode displays an enhanced capacity of 346 mAh g^(−1) at 30 mA g^(−1) with a high ICE value of~80.6%and most of the capacity(~90%)is below 1 V.Moreover,the high-loading electrode(~19 mg cm^(−2))exhibits a good temperature endurance with a high areal capacity of 6.14 mAh cm^(−2) at 25℃ and 5.32 mAh cm^(−2) at −20℃.Based on the in situ X-ray diffraction and ex situ solid-state nuclear magnetic resonance results,the designed ultra-micropores provide the extra Na+storage sites,which mainly contributes to the enhanced capacity.This proposed strategy shows a good potential for the development of high-performance SIBs.