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3D Nanocomposite Thin Film Cathodes for Micro-Batteries with Enhanced High-Rate Electrochemical Performance over Planar Films

Published version

Published version
Peer-reviewed

Repository DOI


Change log

Authors

Daramalla, V 
Nayak, D 
Sayed, FN 
Mahadevegowda, A 

Abstract

jats:titleAbstract</jats:title>jats:pHigh energy and high power density rechargeable micro‐batteries are a necessity for powering the next generation of flexible electronics, internet of things, and medical technology devices. In theory, significant improvements in the capacity, current and power densities of micro‐batteries would result if 3D architectures with enhanced interdigitated component interface areas and shortened ion diffusion path‐lengths  were  used. Further gains are achievable if the materials utilized have high crystalline quality and are preferentially oriented for fast lithium intercalation. In this work, this is achieved by creating epitaxial thin film cathodes comprised of nanopillars of LiMnjats:sub2</jats:sub>Ojats:sub4</jats:sub> (LMO) embedded in a supporting matrix of electronically conducting SrRuOjats:sub3</jats:sub> (SRO). The first electrochemical study of such a 3D vertically aligned nanocomposite (VAN) that displays clear cathode redox signatures is provided, and demonstrates remarkable capacity retention under high‐rate regimes. The electrochemical performance is shown to be dependent on the nanopillar topography, namely the crystallographic orientation, nanopillar dimensions, and electrode/electrolyte interfacial surface area. This work offers a pathway to realizing 3D architectured micro‐batteries with high‐capacity retention under high‐rate conditions enabling fast charge capabilities.</jats:p>

Description

Keywords

electrochemistry, epitaxial thin films, fast charging, micro-batteries, nanocomposites

Journal Title

Advanced Energy Materials

Conference Name

Journal ISSN

1614-6832
1614-6840

Volume Title

Publisher

Wiley
Sponsorship
Engineering and Physical Sciences Research Council (EP/P007767/1)
Engineering and Physical Sciences Research Council (EP/P030467/1)
Engineering and Physical Sciences Research Council (EP/P024947/1)
European Commission Horizon 2020 (H2020) ERC (882929)
Engineering and Physical Sciences Research Council (EP/R00661X/1)
European Commission Horizon 2020 (H2020) ERC (835073)