Cellulose nanofiber-derived carbon aerogel for advanced room-temperature sodium–sulfur batteries

作     者：Wu Yang Wang Yang Ren Zou Yongfa Huang Haihong Lai Zehong Chen Xinwen Peng 

作者机构：State Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouChina 

出 版 物：《Carbon Energy》 (碳能源（英文）)

年 卷 期：2023年第5卷第1期

页      面：1-15页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 0808[工学-电气工程] 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）] 0703[理学-化学] 

基　　金：support of the Guangdong Basic and Applied Basic Research Foundation(grant nos.2020A1515110705 and 2021A1515110245) the China Postdoctoral Science Foundation(grant nos.2020M682711 and 2020M682710) the National Program for Support of Topnotch Young Professionals(grant no.x2qsA4210090) the National Natural Science Foundation of China(grant no.31971614) the State Key Laboratory of Pulp and Paper Engineering(grant no.2020C03). 

主　　题：carbon aerogel cellulose nanofiber N,S codoping redox kinetics sodium–sulfur batteries 

摘      要：Room-temperature sodium–sulfur(RT/Na–S)batteries are regarded as promising large-scale stationary energy storage systems owing to their high energy density and low cost as well as the earth-abundant reserves of sodium and sulfur.However,the diffusion of polysulfides and sluggish kinetics of conversion reactions are still major challenges for their application.Herein,we developed a powerful and functional separator to inhibit the shuttle effect by coating a lightweight three-dimensional cellulose nanofiber-derived carbon aerogel on a glass fiber separator(denoted NSCA@GF).The hierarchical porous structures,favorable electronic conductivity,and three-dimensional interconnected network of N,S-codoped carbon aerogel endow a multifunctional separator with strong polysulfide anchoring capability and fast reaction kinetics of polysulfide conversion,which can act as the barrier layer and an expanded current collector to increase sulfur utilization.Moreover,the hetero-doped N/S sites are believed to strengthen polysulfide anchoring capability via chemisorption and accelerate the redox kinetics of polysulfide conversion,which is confirmed from experimental and theoretical results.As a result,the assembled Na–S coin cells with the NSCA@GF separator showed a high reversible capacity(788.8 mAh g^(−1) at 0.1 C after 100 cycles)and superior cycling stability(only 0.059%capacity decay per cycle over 1000 cycles at 1 C),thereby demonstrating the significant potential for application in high-performance RT/Na–S batteries.