Encapsulation of MnS Nanocrystals into N,S-Co-doped Carbon as Anode Material for Full Cell Sodium-Ion Capacitors  

作　　者：Shaohui Li Jingwei Chen Jiaqing Xiong Xuefei Gong Jinghao Ciou Pooi See Lee 

机构地区：[1]School of Materials Science and Engineering,Nanyang Technological University,Singapore 639798,Singapore [2]Singapore-HUJ Alliance for Research and Enterprise(SHARE),Nanomaterials for Energy and Water Nexus(NEW),Campus for Research Excellence and Technological Enterprise(CREATE),1 Create way,Singapore 138602,Singapore

出　　处：《Nano-Micro Letters》2020年第3期55-68,共14页纳微快报（英文版）

基　　金：financially supported by the NRF Investigatorship (NRFI), Award No. NRF-NRFI2016-05;the Campus for Research Excellent and Technological Enterprise (CREATE),National Research Foundation, Prime Minister’s Office, Singapore

摘　　要：Sodium-ion capacitors(SICs)have received increasing interest for grid stationary energy storage application due to their affordability,high power,and energy densities.The major challenge for SICs is to overcome the kinetics imbalance between faradaic anode and nonfaradaic cathode.To boost the Na+reaction kinetics,the present work demonstrated a high-rate MnS-based anode by embedding the MnS nanocrystals into the N,S-co-doped carbon matrix(MnS@NSC).Benefiting from the fast pseudocapacitive Na+storage behavior,the resulting composite exhibits extraordinary rate capability(205.6 mAh g−1 at 10 A g−1)and outstanding cycling stability without notable degradation after 2000 cycles.A prototype SIC was demonstrated using MnS@NSC anode and N-doped porous carbon(NC)cathode;the obtained hybrid SIC device can display a high energy density of 139.8 Wh kg−1 and high power density of 11,500 W kg−1,as well as excellent cyclability with 84.5%capacitance retention after 3000 cycles.The superior electrochemical performance is contributed to downsizing of MnS and encapsulation of conductive N,S-co-doped carbon matrix,which not only promote the Na+and electrons transport,but also buffer the volume variations and maintain the structure integrity during Na+insertion/extraction,enabling its comparable fast reaction kinetics and cyclability with NC cathode.Sodium-ion capacitors（SICs） have received increasing interest for grid stationary energy storage application due to their affordability,high power,and energy densities.The major challenge for SICs is to overcome the kinetics imbalance between faradaic anode and nonfaradaic cathode.To boost the Na+reaction kinetics,the present work demonstrated a high-rate MnS-based anode by embedding the MnS nanocrystals into the N,S-co-doped carbon matrix（MnS@NSC）.Benefiting from the fast pseudocapacitive Na+ storage behavior,the resulting composite exhibits extraordinary rate capability(205.6 mAh g-1 at 10 A g-1) and outstanding cycling stability without notable degradation after 2000 cycles.A prototype SIC was demonstrated using MnS@NSC anode and N-doped porous carbon（NC） cathode;the obtained hybrid SIC device can display a high energy density of 139.8 Wh kg-1 and high power density of 11,500 W kg-1,as well as excellent cyclability with 84.5%capacitance retention after 3000 cycles.The superior electrochemical performance is contributed to downsizing of MnS and encapsulation of conductive N,S-co-doped carbon matrix,which not only promote the Na+ and electrons transport,but also buffer the volume variations and maintain the structure integrity during Na+ insertion/extraction,enabling its comparable fast reaction kinetics and cyclability with NC cathode.

关 键 词：Sodium-ion capacitor Nanocrystal Co-doped carbon Pseudocapacitive control behavior 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]