无定形固体
硫黄
无定形二氧化硅
电极
化学工程
电池(电)
材料科学
多硫化物
化学
钠
无机化学
二氧化硫
有机化学
冶金
物理化学
电解质
物理
工程类
功率(物理)
量子力学
作者
Jiahui Zhou,Yue Yang,Yingchao Zhang,Shuaikang Duan,Xia Zhou,Wei Sun,Shengming Xu
标识
DOI:10.1002/anie.202015932
摘要
The room-temperature (RT) Na/S battery is a promising energy storage system owing to suitable operating temperature, high theoretical energy density, and low cost. However, it has a poor cycle life and low reversible capacity. In this work, we report a long-life RT-Na/S battery with amorphous porous silica as a sulfur host. The sulfur is loaded into amorphous silica by a dipping method; the optimal sulfur loading is up to 73.48 wt %. Molecular dynamics simulation and first-principles calculations suggest that the complex pores, acting as micro-containers and the formation of Na-O chemical bonds between amorphous silica and sodium polysulfide, give the electrodes a strong ability to inhibit sodium polysulfide shuttle. This would give rise to effectively avoiding the loss of active sulfur, corresponding to a superior capacity and an excellent cyclability even at 10 A gsulfur−1 (nearly 100 % coulomb efficiency and high reversible capacity of 955.8 mAh gsulfur−1 after 1460 cycles).
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