Stability of carbon electrodes for aqueous lithium-air secondary batteries

JOURNAL OF POWER SOURCES

卷:245

Article

Ohkuma, Hirokazu¹  Uechi, Ichiro¹  Matsui, Masaki¹  Takeda, Yasuo¹  Yamamoto, Osamu¹  Imanishi, Nobuyuki¹ 

[1] Mie Univ, Grad Sch Engn, Tsu, Mie 5148507, Japan

关键词: Aqueous lithium-air battery;    Oxygen electrode;    Carbon electrode;    High energy density battery;   

DOI  :  10.1016/j.jpowsour.2013.06.146

来源: Elsevier

【 摘 要 】

The air electrode performance of various carbon materials, such as Ketjen black (KB), acetylene black (AB and AB-5), Vulcan XC-72R (VX), and vapor grown carbon fiber (VGCF) with and without La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) catalyst were examined in an aqueous solution of saturated LiOH with 10 M LiCl in the current density range 0.2-2.0 mA cm(-2). The best performance for oxygen reduction and evolution reactions was observed for the KB electrode, which has the highest surface area among the carbon materials examined. A steady over-potential of 0.2 V was obtained for the oxygen reduction reaction using the KB electrode without the catalyst, while the over-potential was 0.15 V for KB with the LSCF catalyst at 2.0 mA cm(-2). The over-potentials for the oxygen evolution reaction were slightly higher than those for the oxygen reduction reaction, and gradually increased with the polarization period. Analysis of the gas in the cell after polarization above 0.4 V revealed the evolution of a small amount of CO during the oxygen evolution reaction by the decomposition of carbon in the electrode. The amount of CO evolved was significantly decreased by the addition of LSCF to the carbon electrode. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.

【 授权许可】

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