分离器(采油)
氧化还原
化学工程
电解质
聚丙烯腈
阳极
纳米纤维
材料科学
锂离子电池
重量分析
循环伏安法
离子电导率
化学
无机化学
电极
电池(电)
聚合物
电化学
复合材料
有机化学
物理
物理化学
量子力学
工程类
热力学
功率(物理)
作者
Yifu Li,Yi Zhang,Norman Y. Zhou,Hesheng Yu,Zhongchao Tan
标识
DOI:10.1016/j.ces.2022.117873
摘要
Separator is a key component of lithium-ion battery (LIB), and a redox-active separator can enhance the capacity of LIB by participating in battery reactions. This paper reports a redox-active separator based on Fe(CN)64- doped polypyrrole (PPy) composite nanofibers fabricated by electrospinning and in-situ polymerization. The separator is composed of one layer of Polyacrylonitrile (PAN)@doped-PPy core–shell structured nanofibers and another layer of PAN nanofibers. The porosity, electrolyte uptake, and ionic conductivity of the optimized redox-active separator are 79.3 ± 7.1%, 294.6 ± 31.5%, and 1.57 ± 0.06 mS∙cm−1, respectively. These values are greater than those of a commercial PP separator, 41%, 81.5 ± 17.4%, and 0.75 ± 0.02 mS∙cm−1, respectively. Accordingly, the discharge capacity of the battery cell with the redox-active separator is up to 158.7–227.0 mAh∙g−1 at the current rates of 2.0–0.2C, outperforming conventional inert separators. The enhanced battery capacity is stemmed from the redox activity of the doped-PPy polymer, as evidenced by the wider cathodic and anodic peaks in the cyclic voltammetry. In addition, the battery cells tested with redox-active separators show gravimetric energy densities of up to 103.0 mAh∙g−1, which is 56.1% and 27.2% greater than those of a commercial PP separator and the redox-active separator reported in the literature.
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