分离器(采油)
离子
钠
纤维素
储能
电解质
碳酸丙烯酯
材料科学
化学工程
复合数
化学
复合材料
有机化学
电极
热力学
工程类
物理化学
功率(物理)
物理
冶金
量子力学
作者
Jia-Lin Yang,Xinxin Zhao,Wei Zhang,Kai Ren,Xiao-Xi Luo,Junming Cao,Shuohang Zheng,Wen-Liang Li,Xing-Long Wu
标识
DOI:10.1002/ange.202300258
摘要
Sodium-ion batteries (SIBs) have great potential for large-scale energy storage. Cellulose is an attractive material for sustainable separators, but some key issues still exist affecting its application. Herein, a cellulose-based composite separator ([email protected]) was prepared by immersion curing of cellulose-based separators (CP) with poly(propylene carbonate) (PPC). With the assistance of PPC, the [email protected] separator is able to operate the cell stably at high voltages (up to 4.95 V). The “pore-hopping” ion transport mechanism in [email protected] opens up extra Na+ migration paths, resulting in a high Na+ transference number (0.613). The separator can also tolerate folding, bending and extreme temperature under certain circumstances. Full cells with [email protected] reveal one-up capacity retention (96.97 %) at 2C after 500 cycles compared to cells with CP. The mechanism highlights the merits of electrolyte analogs in separator modification, making a rational design for durable devices in advanced energy storage systems.
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