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Micron-sized single-crystal cathodes for sodium-ion batteries

Venkat Pamidi, Shivam Trivedi, Santosh Kumar Behara, Maximilian Fichtner, Anji Munnangi Orcid Logo

iScience, Volume: 25, Issue: 5, Start page: 104205

Swansea University Authors: Santosh Kumar Behara, Anji Munnangi Orcid Logo

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DOI (Published version): 10.1016/j.isci.2022.104205

Abstract

Confining the particle-electrolyte interactions to the particle surface in electrode materials is vital to develop sustainable and safe batteries. Micron-sized single-crystal particles offer such opportunities. Owing to the reduced surface area and grain boundary-free core, particle-electrolyte inte...

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Published in: iScience
ISSN: 2589-0042
Published: Elsevier BV 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa60744
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Abstract: Confining the particle-electrolyte interactions to the particle surface in electrode materials is vital to develop sustainable and safe batteries. Micron-sized single-crystal particles offer such opportunities. Owing to the reduced surface area and grain boundary-free core, particle-electrolyte interactions in micron-sized single-crystal particles will be confined to the particle surface. Here, we reveal the potential of such materials in sodium-ion batteries. We synthesized and investigated the chemical, electrochemical, and thermal properties of single-crystalline P2-type Na0.7Mn0.9Mg0.1O2 as a cathode material for sodium-ion batteries. Single-crystalline Na0.7Mn0.9Mg0.1O2 with a mean particle size of 8.1 μm exhibited high cycling and voltage stability. In addition, the exothermic heat released by the charged single-crystal Na0.7Mn0.9Mg0.1O2 cathodes was four times lower than that of the corresponding polycrystalline Na0.7Mn0.9Mg0.1O2. This significantly enhances the thermal stability of electrode materials and possibly mitigates thermal runaways in batteries. Surprisingly, single crystals of Na0.7Mn0.9Mg0.1O2 were relatively stable in water and ambient atmosphere.
College: Faculty of Science and Engineering
Funders: This work contributes to the research performed at CELEST (Center for Electrochemical Energy Storage Ulm-Karlsruhe) and was funded by the German Research Foundation (DFG) under Project ID 390874152 (POLiS Cluster of Excellence). MAR acknowledges Engineering and Physical Sciences Research Council (EPSRC): grant EP/V014994/1. The authors acknowledge the help of Tobias Braun for FIB measurement.
Issue: 5
Start Page: 104205

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