分离器(采油)
材料科学
阴极
电解质
重量分析
化学工程
阳极
水分
氧气
聚氨酯
电极
金属
无机化学
复合材料
冶金
化学
有机化学
物理化学
工程类
物理
热力学
作者
Byung Gon Kim,Jooseong Kim,Jaeyun Min,Jun Young Lee,Jeong-Hoon Choi,Min Chul Jang,Stefan Freunberger,Jang Wook Choi
标识
DOI:10.1002/adfm.201504437
摘要
Despite the unparalleled theoretical gravimetric energy, Li-O2 batteries are still under a research stage because of their insufficient cycle lives. While the reversibility in air-cathodes has been lately improved significantly by the deepened understanding on the electrode–electrolyte reaction and the integration of diverse catalysts, the stability of the Li metal interface has received relatively much less attention. The destabilization of the Li metal interface by crossover of water and oxygen from the air-cathode side can indeed cause as fatal degradation for the cycle life as the irreversibility of the air-cathodes. Here, it is reported that cheap poreless polyurethane separator can effectively suppress this crossover while allowing Li ions to diffuse through selectively. The polyurethane separator also protects Li metal anodes from redox mediators used for enhancing the reversibility of the air-cathode reaction. Based on the Li metal protection, a persistent capacity of 600 mAh g−1 is preserved for more than 200 cycles. The current approach can be readily applicable to many other rechargeable batteries that suffer from similar interfacial degradation by side products from the other electrode.
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