新型炭材料Issue(4)：319-326,8.
层次孔活性炭气凝胶/硫复合正极材料的制备及其电化学性能
Preparation and electrochemical performance of a hierarchically porous activated carbon aerogel/sulfur cathode for lithium-sulfur batteries
唐志伟 1徐飞 1梁业如 1吴丁财 1符若文1
作者信息
- 1. 中山大学 化学与化学工程学院材料科学研究所，教育部聚合物复合材料及功能材料重点实验室，广东 广州 510275
- 折叠
摘要
Abstract
An activated carbon aerogel with a hierarchical pore structure was prepared through KOH activation with a KOH/organ-ic aerogel with mass ratio 3:1, followed by carbonization at 900 ℃ for 3 h. The activated carbon aerogel was used as a conductive host of elemental sulfur to prepare a composite by a melt-infiltration method. Nitrogen adsorption, SEM, TEM, XRD and XPS were used to characterize the structure and morphology of the samples before and after the sulfur infiltration. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy were used to evaluate the electrochemical performance of the composite as a cathode in lithium ion batteries. It is found that the composite has a sulfur content of up to 66. 2%, a high initial discharge capacity of 1 287 mAh·g-1 at a current density of 0. 2 C and a retained capacity of 643 mAh·g-1 after 200 cycles, which are much higher than those of a sulfur cathode without the carbon host. The composite also exhibits excellent rate capability.关键词
锂硫电池/活性炭气凝胶/KOH活化/复合材料/电化学性能Key words
Lithium-sulfur battery/Activated carbon aerogel/KOH activation/Composite material/Electrochemical performance分类
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唐志伟,徐飞,梁业如,吴丁财,符若文..层次孔活性炭气凝胶/硫复合正极材料的制备及其电化学性能[J].新型炭材料,2015,(4):319-326,8.
