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

Luo, Zhihong, Ji, Chenhao, Yin, Liankun, Zhu, Guangbin, Xu, Bin, Wang, Yucheng, Liu, Xiaoteng, Zhuge, Xiangqun and Luo, Kun (2020) A Ga-Sn Liquid Metal Mediated Structural Cathode for Li-O2 Batteries. Materials Today Energy. ISSN 2468-6069 (In Press)

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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 multi-walled 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 grown 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.

Item Type: Article
Uncontrolled Keywords: Li-O2 batteries, Ga-Sn liquid metal, flaky Li2O2, cathode passivation
Subjects: H600 Electronic and Electrical Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 08 Oct 2020 10:37
Last Modified: 08 Oct 2020 10:45
URI: http://nrl.northumbria.ac.uk/id/eprint/44452

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