A gel polymer electrolyte obtained from cellulose acetate/polyvinylidene fluoride composite electrospun membrane for safe lithium metal batteries with high-rate capability

聚偏氟乙烯 醋酸纤维素 材料科学 电解质 复合数 聚合物 锂(药物) 纤维素 氟化物 化学工程 复合材料 化学 电极 无机化学 医学 生物化学 物理化学 工程类 内分泌学
作者
Zhengfeng Zhu,Xiangyu Shi,Jie Zhou,Xiangfei Li,Yan Liu,Yawen Li,Ye Xiong,Yusong Zhu
出处
期刊:Polymer [Elsevier BV]
卷期号:308: 127412-127412 被引量:10
标识
DOI:10.1016/j.polymer.2024.127412
摘要

Li metal battery is a promising next-generation power storage devices, but faces the serious safety issues caused by the uncontrolled Li dendrite growth and leakage of the flammable organic electrolyte. Herein, a low-cost CA/PVDF (cellulose acetate/polyvinylidene fluoride) composite membrane is prepared via electrospinning technology for safe lithium metal batteries . This membrane (45 μm) exhibits the high porosity (76.9 %) and excellent thermally stability (>180 °C) preventing the short circuit during abuse. The CA/PVDF-based gel polymer electrolyte (GPE), fabricated with CA/PVDF electrospun membrane swelled by carbonate-based organic liquid electrolyte, delivers the ionic conductivity of 1.82 mS cm −1 and Li + transfer number of 0.506, which achieve uniform Li + ion electrodeposition and inhibit the formation of lithium dendrites . As the results, the symmetrical cell Li/CA/PVDF-based GPE/Li exhibits the impressive reversible Li stripping/plating behavior over 300 h at 1 mA cm −2 with the capacity of 1 mA h cm −2 . Furthermore, the assembled LiFePO 4 /GPE/Li battery exhibits the capacity of 101.2 mA h g −1 at 5C with the capacity retention of 94.6 % after 400 cycles, which exceeds that of traditional liquid electrolytes. This research provides a low-cost gel polymer electrolyte via the electrospinning technique for rechargeable lithium batteries with good electrochemical performance and high security. A low-cost CA/PVDF composite membrane is designed via electrospinning technology for safe lithium metal batteries, which achieves uniform Li + ion electrodeposition , inhibits formation of lithium dendrites over 300 h and stabilizes the interface between electrode and electrolyte. The assembled LiFePO 4 /CA/PVDF-based GPE/Li battery exhibits the capacity of 101.2 mA h g −1 at 5C with the capacity retention of 94.6 % after 400 cycles. • A low-cost CA/PVDF composite membrane is prepared via electrospinning technology. • The CA/PVDF-based gel polymer electrolyte delivers the ionic conductivity of 1.82 mS cm −1 and Li + transfer number of 0.506, which achieve uniform Li + ion electrodeposition. • The assembled Li symmetrical cell exhibits the impressive reversible cycle over 300 h. • LiFePO 4 /GPE/Li battery exhibits the capacity of 101.2 mA h g −1 at 5C with the capacity retention of 94.6 % after 400 cycles.
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