The use of mixed carbon materials with improved oxygen transport in?a?lithium-air battery

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• 作者：Yining Zhang ; Huamin Zhang ; Jing Li ; Meiri Wang ; Hongjiao Nie ; Fengxiang Zhang
• 关键词：Lithium/air battery ; Carbon material ; Electrode structure ; Oxygen transport ; Porosity
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 October, 2013
• 年：2013
• 卷：240
• 期：Complete
• 页码：390-396
• 全文大小：3290 K

文摘

Two commercial carbon blacks, Ketjen black EC600JD (KB600) and Super P with quite different porosity parameters, are used for the cathode of a lithium-air battery. With high specific pore volume, KB600 shows a higher weight specific capacity. However, Super P exhibits a super high volume specific capacity, about 7 times higher than that of KB600, ascribed to its higher proportion of pores with suitable size for the deposition of solid products. The effects of O₂ partial pressure and discharge rate on the specific capacity are investigated, combined with characterizations of contact angle and the structure of the electrodes. It is demonstrated that the Super P electrode possesses better O₂ transport that improves the use of the whole electrode volume, and the special mechanism of O₂ diffusion in the Super P electrode is proposed. By mixing KB600 with Super P with a weight ratio of 5:1, an electrode is obtained that exhibits increased O₂ transport. The weight specific capacity is 1219?mAh?g^?1, about 1.2 times higher than that of KB600.