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

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

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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 multi-functional 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 1C),thereby demonstrating the significant potential for application in high-performance RT/Na-S batteries.

carbon aerogelcellulose nanofiberNS codopingredox kineticssodium-sulfur batteries

Wu Yang、Wang Yang、Ren Zou、Yongfa Huang、Haihong Lai、Zehong Chen、Xinwen Peng

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State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou,China

国家自然科学基金制浆造纸工程国家重点实验室项目Guangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research FoundationNational Program for Support of Topnotch Young Professionals中国博士后科学基金中国博士后科学基金

319716142020C032020A15151107052021A1515110245x2qsA42100902020M6827102020M682711

2023

10.1002/cey2.203

CSCD
ISSN：
年,卷(期)：2023.5(1)
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