A dual pore carbon aerogel based air cathode for a highly rechargeable lithium-air battery

JOURNAL OF POWER SOURCES

卷:272

Article

Wang, Fang¹  Xu, Yang-Hai¹  Luo, Zhong-Kuan^1,2  Pang, Yan¹  Wu, Qi-Xing¹  Liang, Chun-Sheng¹  Chen, Jing¹  Liu, Dong¹  Zhang, Xiang-hua^1,3 

[1] Shenzhen Univ, Coll Chem & Chem Engn, Shenzhen, Peoples R China

[2] Zhejiang Univ, Zhejiang Calif Int NanoSyst Inst, Dept Mat Sci & Engn, Hangzhou, Zhejiang, Peoples R China

[3] Univ Rennes 1, Inst Sci Chim Rennes, Lab Glasses & Ceram, UMR CNRS 6226, F-35042 Rennes, France

关键词: Lithium-air battery;    Carbon aerogel;    Dual pore structure;    Cathode passivation;    Sulfolane;   

DOI  :  10.1016/j.jpowsour.2014.08.126

来源: Elsevier

【 摘 要 】

Cathode structure plays a vital role in lithium-air battery for that it can provide space for discharged products accommodation and free path for oxygen, e(-) and Li+ transport. However, pore blockage, cathode passivation and degradation all result in low discharge rates and poor cycling capability. To get rid of these predicaments, a novel highly conductive dual pore carbon aerogel based air cathode is fabricated to construct a lithium-air battery, which exhibits 18 to 525 cycles in the LiTFSI/sulfolane electrolyte at a current density varying from 1.00 mA cm(-2) to 0.05 mA cm(-2), accompanied by a high energy efficiency of 78.32%. We postulate that the essence lies in that the as-prepared air cathode inventively create a suitable tri-phase boundary reaction zone, facilitating oxygen and Li+ diffusion in two independant pore channels, thus realizing a relative higher discharge rate capability, lower pore blockage and cathode passivation. Further, pore structure, carbon loading, rate capability, discharge depth and the air's effect are exploited and coordinated, targeting for a high power and reversible lithium-air battery. Such nano-porous carbon aerogel air cathode of novel dual pore structure and material design is expected to be an attractive alternative for lithium-air batteries and other lithium based batteries. (C) 2014 Elsevier B.V. All rights reserved.

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