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

Nano-Micro Letters 2020年第3期12卷 55-68页

作者： Shaohui Li Jingwei Chen Jiaqing Xiong Xuefei Gong Jinghao Ciou Pooi See Lee School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore 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 waySingapore 138602Singapore

Sodium-ion capacitors(SICs)have received increasing interest for grid stationary energy storage application due to their affordability,high power,and energy *** major challenge for SICs is to overcome the kinetics imbalance between faradaic anode and nonfaradaic *** 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 *** 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

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