Facile fabrication of regenerated cellulose-based separators for high-performance lithium-ion batteries by regulating degrees of polymerization

纤维素 分离器(采油) 再生纤维素 材料科学 化学工程 溶解 离子电导率 电解质 热稳定性 多孔性 极限抗拉强度 高分子化学 复合材料 化学 电极 工程类 物理 物理化学 热力学
作者
Zhijun Hu,Quanxin Liu,Qinghua Zhang,Jinchao Zhang,Lu Chen,Shuoyuan Xu
出处
期刊:International Journal of Biological Macromolecules [Elsevier BV]
卷期号:268: 131854-131854 被引量:4
标识
DOI:10.1016/j.ijbiomac.2024.131854
摘要

Cellulose-based separators have great application prospects in the field of lithium-ion batteries (LIBs) due to their excellent wettability and thermal stability. However, most current cellulose-based separators come from high-cost nanocellulose and bacterial cellulose. Herein, regenerated cellulose (RC) separators were prepared from dissolving pulp with different degrees of polymerization (DPs) by using the NaOH/urea/thiourea dissolution system as well as a nonsolvent-induced phase separation method. The results showed that the DP of cellulose had a significant influence on the mechanical properties, pore structure, and electrochemical properties of the resultant RC separator. An appropriate increase in the DP could improve the mechanical strength, porosity, and ionic conductivity of the separator. The RC separator with a DP of 599 exhibited the best performance with a porosity of 56.1 %, an average pore size of 305 nm, an electrolyte uptake of 339 %, a tensile strength of 38.3 MPa, and an ionic conductivity of 1.88 mS·cm−1. The lithium-ion battery prepared with the optimal RC separator had a specific capacity of 156.55 mAh/g for 100 cycles at a current density of 0.5 C and a coulombic efficiency of more than 96 %, which was a clear advantage over the commercially available Celgard2400 and cellulose separators. This work makes contributions to the development of high-performance LIBs separators from cellulose.
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