多硫化物
材料科学
电解质
枝晶(数学)
电池(电)
锂硫电池
锂(药物)
溶剂
无机化学
阴极
化学工程
阳极
电化学
集电器
有机化学
化学
物理化学
电极
功率(物理)
内分泌学
工程类
物理
医学
量子力学
数学
几何学
作者
Chao Qu,Yuqing Chen,Xiaofei Yang,Hongzhang Zhang,Xianfeng Li,Huamin Zhang
出处
期刊:Nano Energy
[Elsevier]
日期:2017-09-01
卷期号:39: 262-272
被引量:97
标识
DOI:10.1016/j.nanoen.2017.07.002
摘要
Although LiNO3 could effectively solve the polysulfide (PS) shuttle problem in Li-S battery, however, it causes explosive hazards with the cathode composition like gun powder (KNO3, Sulfur, and Carbon). Herein, a LiNO3-free electrolyte was designed to simultaneously inhibit the PS shuttle and lithium dendrite problem, with pure 1,3-dioxolane (DOL) as the solvent, due to the low Ksp of polysulfide as well as the stable SEI on lithium. As a synergistic effect, it enabled the Li-S batteries to achieve 95% coulombic efficiency, 3 times longer cycle life, and a slower self-discharging rate at 55 °C compared to the DOL/DME blend solvent. Four kinds of batteries, from coins to soft packages, were carried out to confirm the superiority of this electrolyte. Li-S soft package batteries with 4000 mAh capacity were assembled, achieving the specific energy of 350 Wh kg−1 and specific power of 60 W kg−1, which could cycle over 30 times at 0.2 C with high capacity retention of 80%. It is among the best comprehensive Li-S batteries performance reported using LiNO3-free electrolyte.
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