材料科学
多硫化物
阳极
电解质
阴极
电化学
电极
锂(药物)
储能
溶解
碳纳米管
化学工程
碳纤维
纳米技术
硫黄
电流密度
复合材料
冶金
电气工程
化学
物理
工程类
内分泌学
物理化学
功率(物理)
复合数
医学
量子力学
作者
Yueying Peng,Zhipeng Wen,Chaoyue Liu,Jing Zeng,Yunhui Wang,Jinbao Zhao
标识
DOI:10.1021/acsami.8b19866
摘要
Lithium sulfur (Li–S) batteries are appealing energy storage technologies because of their high theoretical energy density and low cost. However, Li–S batteries suffer from poor practical energy density due to serious polysulfide dissolution and shuttle, as well as lithium anode corrosion. Herein, we provide a dual-protection strategy for the high-energy-density Li–S cell by inserting two nanotube paper (CNTp) interlayers on both electrodes. The CNTp interlayers can provide stable interfaces for both the cathode and anode, facilitating the formation of uniform charge transfer and ion flue. As a result, the Li–S cell exhibits stable cycling performance and great rate ability up to a high rate of 5 C (5 C = 25 mA cm–2). Even at an ultrahigh sulfur load of 12.1 mg cm–2, a high areal capacity of 12.6 mAh cm–2 is still achieved, which can remain at 11.1 mAh cm–2 after 30 cycles (corresponding to 917 mAh g–1). The refined interfaces between the electrolyte and both electrodes are further confirmed by the micro-zone current distribution and COMSOL simulation. Our approach provides an effective and universal strategy to improve the electrochemical stability of the Li–S cell at high sulfur load, opening a new platform for designing advanced metal cell systems.
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