Correlating Li/O2 cell capacity and product morphology with discharge current

ACS Applied Materials & Interfaces
Lucas D GriffithCharles W Monroe

Abstract

The discharge rate is critical to the performance of lithium/oxygen batteries: it impacts both cell capacity and discharge-phase morphology, and in so doing may also affect the efficiency of the oxygen-evolution reaction during recharging. First-discharge data from tens of Li/O2 cells discharged across four rates are analyzed statistically to inform these connections. In the practically significant superficial current-density range of 0.1 to 1 mA cm(-2), capacity is found to fall as a power law, with a Peukert's-law exponent of 1.6 ± 0.1. X-ray diffractometry confirms the dominant presence of crystalline Li2O2 in the discharged electrodes. A completely air-free sample-transfer technique was developed to implement scanning electron microscopy (SEM) of the discharge product. SEM imaging of electrodes with near-average capacities provides statistically significant measures of the shape and size variation of electrodeposited Li2O2 particles with respect to discharge current. At lower rates, typical "toroidal" particles are observed that are well approximated as cylindrical structures, whose average radii remain relatively constant as discharge rate increases, whereas their average heights decrease. At the highest rate studied, air-...Continue Reading

References

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Citations

Jan 23, 2016·The Journal of Physical Chemistry Letters·Malachi NokedSang Bok Lee
Aug 13, 2015·The Journal of Physical Chemistry Letters·Maxwell D RadinDonald J Siegel
Jul 28, 2016·Physical Chemistry Chemical Physics : PCCP·Jing LiuCharles W Monroe
Jan 26, 2017·ACS Applied Materials & Interfaces·Hoi-Min KwonMasayoshi Watanabe
Jul 14, 2016·ACS Applied Materials & Interfaces·Neng XiaoYiying Wu
Aug 5, 2018·Chemistry, an Asian Journal·Preeti BhauriyalBiswarup Pathak
Mar 26, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Amangeldi TorayevClare P Grey
May 20, 2021·ACS Applied Materials & Interfaces·Behnaz Rahmani DidarAxel Groß
Jan 18, 2018·The Journal of Physical Chemistry Letters·Amangeldi TorayevAlejandro A Franco
Dec 16, 2016·The Journal of Physical Chemistry Letters·Edmund Martin Mills, Sangtae Kim
Mar 21, 2017·Chemistry of Materials : a Publication of the American Chemical Society·Zhaolong LiMarnix Wagemaker
Aug 31, 2017·ACS Applied Materials & Interfaces·Daniela GiaccoAndrea G Marrani

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