化学
多硫化物
硫黄
石墨烯
氧化物
涂层
溶解
锂(药物)
无机化学
化学工程
阴极
锂硫电池
电化学
电极
电解质
有机化学
医学
工程类
内分泌学
物理化学
作者
Liwen Ji,Mumin Rao,Haimei Zheng,Liang Zhang,Yuanchang Li,Wenhui Duan,Jinghua Guo,Elton J. Cairns,Yuegang Zhang
摘要
The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Here, we use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach enabled us to obtain a uniform and thin (around tens of nanometers) sulfur coating on graphene oxide sheets by a simple chemical reaction–deposition strategy and a subsequent low-temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides enabled us to demonstrate lithium/sulfur cells with a high reversible capacity of 950–1400 mA h g–1, and stable cycling for more than 50 deep cycles at 0.1C (1C = 1675 mA g–1).
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