多硫化物
聚烯烃
分离器(采油)
涂层
材料科学
润湿
电解质
储能
钠
聚丙烯
化学工程
电池(电)
电极
纳米技术
化学
复合材料
冶金
功率(物理)
物理化学
工程类
物理
热力学
量子力学
图层(电子)
作者
Chaozhi Wang,Kaihang Wu,Jingqin Cui,Xiaoliang Fang,Jing Li,Nanfeng Zheng
出处
期刊:Small
[Wiley]
日期:2022-02-20
卷期号:18 (43)
被引量:33
标识
DOI:10.1002/smll.202106983
摘要
Abstract Room‐temperature sodium‐sulfur (RT‐Na‐S) batteries are attracting increased attention due to their high theoretical energy density and low‐cost. However, the traditional RT‐Na‐S batteries assembled with glass fiber (GF) separators are still hindered by the polysulfide shuttle effect and sodium dendrite growth, limiting the battery's capacity and cycling stability. Here, a facile and effective method toward commercial polyolefin separators for constructing stable RT‐Na‐S batteries is presented. By coating commercial polypropylene membrane with core‐shell structured MXene@C nanosheets, a powerful dual‐functional separator with improved electrolyte wettability that can inhibit polysulfide migration and induce uniform sodium disposition is developed. More importantly, the modified separator can also accelerate the conversion kinetics of sodium polysulfides. Benefiting from these characteristics, the as‐prepared RT‐Na‐S battery exhibits a remarkably enhanced capacity (1159 mAh g ‐1 at 0.2 C) and excellent cycling performance (95.8% of capacity retention after 650 cycles at 0.5 C). This study opens a promising avenue for the development of high‐performance Na‐S batteries.
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