A Ga-Sn Liquid Metal Mediated Structural Cathode for Li-O2 Batteries

Zhihong Luo, Chenhao Ji, Liankun Yin, Guangbin Zhu, Ben Bin Xu, Yucheng Wang, Terence Liu, Xiangqun Zhuge, Kun Luo

Research output: Contribution to journalArticlepeer-review

Abstract

One of the recent challenges in Li–O2 battery technology is the cycle life, which can be severely shortened by cathode passivation induced by discharge product accumulation; this can be eliminated by reducing the amount of discharge products. Herein, we report a feasibility study on the development of a Ga–Sn liquid metal (LM)-functionalized multiwalled carbon nanotubes (MWNTs) cathode. In a comparison of MWNT, LM, m-LM/MWNT (pre-mixed LM and MWNTs), and LM/MWNT (LM-modified MWNTs) cathodes, morphology analysis showed that small Li2O2 flakes rather than large crystals grow on the conductive Ga–Sn LM and MWNTs of the LM/MWNT cathode only. The decomposition of the flaky Li2O2 on the LM/MWNT cathode occurred at lower charge overpotentials, resulting in low polarization; thus, the cathode passivation and the consumption of the Li anode were both alleviated during the cyclic process. The LM/MWNT cathode significantly improved the cycle life, rate performance, and ultimate capacity of Li–O2 batteries.
Original languageEnglish
Article number100559
Number of pages7
JournalMaterials Today Energy
Volume18
Early online date12 Oct 2020
DOIs
Publication statusPublished - 1 Dec 2020

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