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MgH2-CoO: a conversion-type composite electrode for LiBH4-based all-solid-state lithium ion batteries.

ABSTRACT: Several studies have demonstrated that MgH2 is a promising conversion-type anode toward Li. A major obstacle is the reversible capacity during cycling. Electrochemical co-existence of a mixed metal hydride-oxide conversion type anode is demonstrated for lithium ion batteries using a solid-state electrolyte. 75MgH2·25CoO anodes are obtained from optimized mixing conditions avoiding reactions occurring during high-energy ball-milling. Electrochemical tests are carried out to investigate the cycling capability and reversibility of the on-going conversion reactions. The cycling led to formation of a single-plateau nanocomposite electrode with higher reversibility yield, lowered discharge-charge hysteresis and mitigated kinetic effect at high C-rate compared to MgH2 anodes. It is believed that reduced diffusion pathways and less polarized electrodes are the origin of the improved properties. The designed composite-electrode shows good preservation and suitability with LiBH4 solid electrolyte as revealed from electron microscopy analyses and X-ray photoelectron spectroscopy.

SUBMITTER: El Kharbachi A 

PROVIDER: S-EPMC9081632 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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MgH<sub>2</sub>-CoO: a conversion-type composite electrode for LiBH<sub>4</sub>-based all-solid-state lithium ion batteries.

El Kharbachi Abdelouahab A   Uesato Hiroki H   Kawai Hironori H   Wenner Sigurd S   Miyaoka Hiroki H   Sørby Magnus H MH   Fjellvåg Helmer H   Ichikawa Takayuki T   Hauback Bjørn C BC  

RSC advances 20180627 41

Several studies have demonstrated that MgH<sub>2</sub> is a promising conversion-type anode toward Li. A major obstacle is the reversible capacity during cycling. Electrochemical co-existence of a mixed metal hydride-oxide conversion type anode is demonstrated for lithium ion batteries using a solid-state electrolyte. 75MgH<sub>2</sub>·25CoO anodes are obtained from optimized mixing conditions avoiding reactions occurring during high-energy ball-milling. Electrochemical tests are carried out to  ...[more]

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