气凝胶
微型多孔材料
碳纤维
电解质
材料科学
阴极
锂(药物)
介孔材料
多孔性
电化学
电池(电)
化学工程
活性炭
氧气
超级电容器
电极
复合材料
化学
催化作用
吸附
有机化学
复合数
医学
功率(物理)
物理化学
内分泌学
工程类
物理
量子力学
作者
Sang Bok,Dong Joon Lee,Victor Roev,Dongmin Im,Seok‐Gwang Doo
标识
DOI:10.1016/j.jpowsour.2013.03.150
摘要
Porosity effect of carbon materials on the electrochemical performances as cathode materials in non-aqueous Li-oxygen cells has been investigated. A carbon aerogel material is chosen to represent mesoporosity and a couple of activated carbon materials are selected to represent microporosity. Carbon aerogel shows at least ten times higher discharge capacity (4155 mAh g−1) than activated carbons. It is found that as much as 61% of pore volume of carbon aerogel is filled with discharge products (Li2O2) while less than 18% of pore volume is occupied with Li2O2 at the end of discharge in activated carbons, indicating that mesopore is more effective than micropore. In another experiments, the electrolyte impregnated electrode shows a capacitor-like discharge behavior, meaning it is necessary to have some open pore for the oxygen supply even though they are micropores.
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