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Article Dans Une Revue Journal of Power Sources Année : 2014

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

Résumé

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.

Domaines

Matériaux
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Dates et versions

hal-01072731 , version 1 (08-10-2014)

Identifiants

Citer

Fang Wang, Yang-Hai Xu, Zhong-Kuan Luo, Yan Pang, Chun-Sheng Liang, et al.. A dual pore carbon aerogel based air cathode for a highly rechargeable lithium-air battery. Journal of Power Sources, 2014, 272, pp.1061 - 1071. ⟨10.1016/j.jpowsour.2014.08.126⟩. ⟨hal-01072731⟩
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