Rational Design of Cellulose Nanofibrils Separator for Sodium-Ion Batteries

被引:13
|
作者
Zhou, Hongyang [1 ]
Gu, Jin [1 ]
Zhang, Weiwei [1 ]
Hu, Chuanshuang [1 ]
Lin, Xiuyi [1 ]
机构
[1] South China Agr Univ, Coll Mat & Energy, Key Lab Biobased Mat & Energy, Minist Educ, 483 Wushan Rd, Guangzhou 510642, Peoples R China
来源
MOLECULES | 2021年 / 26卷 / 18期
关键词
cellulose nanofiber; sodium-ion batteries; separators; pore structure; PERFORMANCE; SURFACE;
D O I
10.3390/molecules26185539
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Cellulose nanofibrils (CNF) with high thermal stability and excellent electrolyte wettability attracted tremendous attention as a promising separator for the emerging sodium-ion batteries. The pore structure of the separator plays a vital role in electrochemical performance. CNF separators are assembled using the bottom-up approach in this study, and the pore structure is carefully controlled through film-forming techniques. The acid-treated separators prepared from the solvent exchange and freeze-drying demonstrated an optimal pore structure with a high electrolyte uptake rate (978.8%) and Na+ transference number (0.88). Consequently, the obtained separator showed a reversible specific capacity of 320 mAh/g and enhanced cycling performance at high rates compared to the commercial glass fiber separator (290 mAh/g). The results highlight that CNF separators with an optimized pore structure are advisable for sodium-ion batteries.
引用
收藏
页数:13
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