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

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

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

详细信息

通讯作者:
吴丁财,教授.E-mail:wudc@mail.sysu.edu.cn;符若文,教授.E-mail:cesfrw@mail.sysu.edu.cn

中图分类号: TB332
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- 文章访问数: 1009
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- 被引次数: 0
出版历程
- 收稿日期: 2015-03-10
- 录用日期: 2015-09-07
- 修回日期: 2015-07-25
- 刊出日期: 2015-08-28

Preparation and electrochemical performance of a hierarchically porous activated carbon aerogel /sulfur cathode for lithium-sulfur batteries

Materials Science Institute, PCFM Laboratory, School of Chemistry&|Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China

摘要

摘要: 以有机气凝胶RC-500为原料,采用低质量比KOH(KOH:有机气凝胶＝3:1)活化的方法,900 ℃炭化活化,制备出一种具有层次孔结构的活性炭气凝胶ACA-500-3。将其作为硫载体,与单质硫在155 ℃熔融复合后制备出含硫量达66.2%的锂硫电池正极复合材料(ACA-500-3-S)。通过N₂吸附、SEM、TEM、XRD和XPS等测试手段考察ACA-500-3和ACA-500-3-S的结构和形貌,并利用循环伏安、恒流充放电和交流阻抗等方法研究ACA-500-3-S的电化学性能。ACA-500-3-S在0.2 C(1 C=1 675 mA·g^-1)电流密度下,初始放电比容量高达1 287 mAh·g^-1,200圈后比容量保持在643 mAh·g ^-1,并表现出良好的倍率性能,明显优于单质硫电极。
- 锂硫电池 /
- 活性炭气凝胶 /
- KOH活化 /
- 复合材料 /
- 电化学性能
Abstract: An activated carbon aerogel with a hierarchical pore structure was prepared through KOH activation with a KOH/organic 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.
- Lithium-sulfur battery /
- Activated carbon aerogel /
- KOH activation /
- Composite material /
- Electrochemical performance

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