纤维素
水溶液
电解质
聚合物
化学工程
固态
铸造
材料科学
聚合物电解质
化学
有机化学
复合材料
电极
物理化学
离子电导率
工程类
作者
Yong Cheng,Zuansi Cai,Jinglei Xu,Zhefei Sun,Xiaoyu Wu,Jiajia Han,Ming‐Sheng Wang,Ming‐Sheng Wang
标识
DOI:10.1002/ange.202400477
摘要
Abstract Polyethylene oxide (PEO)‐based solid‐state batteries hold great promise as the next‐generation batteries with high energy density and high safety. However, PEO‐based electrolytes encounter certain limitations, including inferior ionic conductivity, low Li + transference number, and poor mechanical strength. Herein, we aim to simultaneously address these issues by utilizing one‐dimensional zwitterionic cellulose nanofiber (ZCNF) as fillers for PEO‐based electrolytes using a simple aqueous solution casting method. Multiple characterizations and theoretical calculations demonstrate that the unique zwitterionic structure imparts ZCNF with various functions, such as disrupting PEO crystallization, dissociating lithium salts, anchoring anions through cationic groups, accelerating Li + migration by anionic groups, as well as its inherent reinforcement effect. As a result, the prepared PL‐ZCNF electrolyte exhibits remarkable ionic conductivity (5.37×10 −4 S cm −1 ) and Li + transference number (0.62) at 60 °C without sacrificing mechanical strength (9.2 MPa), together with high critical current density of 1.1 mA cm −2 . Attributed to these merits of PL‐ZCNF, the LiFePO 4 |PL‐ZCNF|Li solid‐state full‐cell delivers exceptional rate capability and cycling performance (900 cycles at 5 C). Notably, the assembled pouch‐cell can maintain steady operation over 1000 cycles with an impressive 93.7 % capacity retention at 0.5 C and 60 °C, highlighting the great potential of PL‐ZCNF for practical applications.
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