聚丙烯腈
电解质
材料科学
电化学
钝化
复合数
阳极
锂(药物)
静电纺丝
化学工程
离子电导率
纳米纤维
电化学窗口
电极
聚合物
纳米技术
复合材料
化学
图层(电子)
医学
内分泌学
工程类
物理化学
作者
Zhiqi Lu,Ji Li,Jinho An,Xiaoyue Zeng,Jinle Lan,Yunhua Yu,Xiaoping Yang
标识
DOI:10.1016/j.jcis.2024.03.058
摘要
The active cyano-group in polyacrylonitrile has severe passivation of lithium anode under larger current density, which restricts the wide application of polyacrylonitrile(PAN) in lithium metal batteries. Herein, in order to address the excessive passivation of lithium metal by PAN, inspired by the pre-oxidation of carbon fibers, PAN was pre-oxidized at 230 °C, which transformed part of the cyano group into a more chemically stable cyclized structure. The electrochemical and mechanical properties of the composite solid electrolyte were effectively improved by introducing the fast ionic conductor Li6.25La3Zr2Al0.25O12 into PAN by electrospinning. The oxidized PAN-based composite solid electrolyte presents high ionic conductivity (3.05 × 10−3 S·cm−1) and high lithium transference number of 0.79 at 25 °C, further contributing to a high electrochemical window (5.3 V). The solid-state batteries assembled by Li||10 wt%-LLZAO@230-oxy-PAN||NCM523 behave superb electrochemical performance, delivering a high initial discharge capacity of 157 mAh g−1 at 0.2 C. After 100 cycles, the capacity retention was 93.3 %, indicating the electrolyte displays great electrochemical stability. This work provides new insights into the structural design of polymer-based high-voltage batteries.
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