分离器(采油)
阳极
聚合物
涂层
化学工程
材料科学
电极
聚丙烯
锂硫电池
硫黄
离子
图层(电子)
锂(药物)
化学
无机化学
高分子化学
有机化学
复合材料
电化学
物理化学
工程类
热力学
医学
物理
内分泌学
作者
Zhong Li,Qing Pan,Peiyue Yang,Shan Jiang,Zhong Zheng,Weida Wu,Jun Xia,Sishi Tang,Dabei Wu,Yi Cao,Jin Xuan,Lun Yang,Longlong Ma,Yayang Tian
标识
DOI:10.1002/chem.202302334
摘要
Abstract Lithium‐sulfur batteries are believed to possess the feasibility to power electric vehicles in the future ascribed to the competitive energy density. However, soluble polysulfides continuously shuttle between the sulfur electrode and lithium anode across the separator, which dramatically impairs the battery's capacity. Herein, the surface of a polypropylene separator (PP film) is successfully modified with a delicately designed cation‐selective polymer layer to suppress the transport of polysulfides. In principle, since bis‐sulfonimide anions groups on the backbone of the polymer are immobilized, only cations can pass through the polymer layer. Furthermore, plenty of ethoxy chains in the polymer can facilitate lithium‐ion mobility. Consequently, in addition to obstructing the movement of negatively charged polysulfides by the electrostatic repulsive force of fixed anions, the coated multi‐functional layer on the PP film also guarantees the smooth conduction of lithium ions. The investigations demonstrate that the battery with the pristine PP film only delivers 228.5 mAh g −1 after 300 cycles at 2 C with a high capacity fading rate of 60.9 %. By contrast, the polymer‐coated sample can release 409.4 mAh g −1 under the identical test condition and the capacity fading rate sharply declines to 43.2 %, illustrating superior cycle performance.
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