Pulse current charging strategy towards high performance of lithium-oxygen batteries
Pulse current charging strategy towards high performance of lithium-oxygen batteries
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DOI：
10.1016/j.surfin.2021.101106
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发表时间：
2021-04
影响因子：
6.2
通讯作者：
Teng Xiao;Zhen-Wei Zhou;Hui Cao;Jianli Zhang;Qiang Chen;Guangya Hou;Huazhen Cao;Ming-Chang Wen;Yi-ping Tang
中科院分区：
文献类型：
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作者：
Teng Xiao;Zhen-Wei Zhou;Hui Cao;Jianli Zhang;Qiang Chen;Guangya Hou;Huazhen Cao;Ming-Chang Wen;Yi-ping Tang
锂氧电池的过电位大、循环性能差是制约其发展的主要因素，这与充电过程中析氧反应（OER）导致放电产物分解缓慢有关。本文提出了一种新的脉冲电流充电方法来解决这些问题。结果表明，与普通恒流试样相比，占空比为50%，频率为1 Hz时，过电位降低25%，循环寿命提高4倍以上。充电过程中，脉冲电流可以降低浓差极化，促进Li 2 O2的分解，增加OER过程的反应动力学，从而降低过电位，改善电化学性能。
Large overpotential and poor cyclability are the main constraints for lithium-oxygen batteries (LOBs), which are usually related to the slow decomposition of the discharge product during oxygen evolution reaction (OER) of charging process. In this paper, a novel method of pulse current charging is developed for solving these problems. The results show, compared with the normal constant current samples, when duty cycle is 50% and frequency is 1 Hz and, the overpotential decreases up to 25% and the cycle life improves more than 4 times. During charging process, pulse current can reduce the concentration polarization and promote the decomposition of Li2O2, and increase the reaction kinetics of OER process, leading to the reduction of overpotential and improvement of electrochemical performance.