Phosphorylated cellulose nanofibers establishing reliable ion-sieving barriers for durable lithium-sulfur batteries

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外文摘要：The shuttle effect is among the most characteristic and formidable challenges in the pursuit of high-performance lithium-sulfur(Li-S)batteries.Herein,phosphorylated cellulose nanofibers(pCNF)are intentionally engineered to establish an ion-sieving barrier against polysulfide shuttling and thereby improve battery performance.The phosphorylation,involving the grafting of phosphate groups onto the cellulose backbone,imparts an exceptional electronegativity that repels the polysulfide anions from penetrating through the separator.Moreover,the electrolyte wettability and Li+transfer can be signifi-cantly promoted by the polar nature of pCNF and the facile Li+disassociation.As such,rational ion man-agement is realized,contributing to enhanced reversibility in both sulfur and lithium electrochemistry.As a result,Li-S cells equipped with the self-standing pCNF separator demonstrate outstanding long-term cyclability with a minimum fading rate of 0.013％per cycle over 1000 cycles at 1 C,and a decent areal capacity of 5.37 mA h cm-2 even under elevated sulfur loading of 5.0 mg cm-2 and limited elec-trolyte of 6.0 mL g-1.This work provides a facile and effective pathway toward the well-tamed shuttle effect and highly durable Li-S batteries.

外文关键词：

Lithium-sulfur batteriesCellulosePhosphorylationIon-sievingShuttle effect

作者：

Zihao Li、Pengsen Qian、Hongyang Li、He Xiao、Jun Chen、Gaoran Li

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作者单位：

School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China

National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials,Fuzhou 350108,Fujian,China

基金：

National Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu ProvinceFundamental Research Funds for the Central UniversitiesOpen Fund of National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials

项目编号：

22109072BK20210349309220103042022KFJJ06

出版年：

2024

DOI：

10.1016/j.jechem.2024.02.002

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.92(5)