High performance CoO nanospheres catalyst synthesized by DC arc discharge plasma method as air electrode for lithium-oxygen battery
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In this paper, a highly-active cobalt oxide (CoO) nanospheres catalyst has been synthesized by DC arc discharge plasma method and used as air electrode for lithium oxygen battery. Through scanning electron microscopy (SEM) observation, the particle size of the cobalt oxide (CoO) catalyst can be controlled between 40~60 nm and dispersed uniformly into the active material. And then the cobalt oxide (CoO) nanospheres mixed with La2O3 and Pt/C makes up the ternary catalyst of the air electrode for lithium oxygen battery. The electrochemical test results show that the oxygen reduction reaction peaks are more obvious, and the increase of charge transfer rate has no significant influence on the diffusion mass transfer rate. The specific capacity and energy density of air electrode with Co-La-Pt ternary catalyst can respectively reach 3250.2 mAh g−1 and 8574.2 Wh kg−1 at 0.025 mA cm−2. After 62 cycles, 38.3% of the initial capacity can still be maintained.
KeywordsLithium-oxygen battery DC arc discharge plasma method CoO nanospheres catalyst Ternary catalysis Electrochemical performance
This work was supported by the National Natural Science Foundation of China (No. 21373002), the Natural Science Foundation of Liaoning Province of China (No.20170540021), the Project of Education Department of Liaoning Province of China (No.LF2017004, LQ2017014), and the Liaoning BaiQianWan Talents Program (No. 201797).
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