Stable Supercapacity of Binder-Free TiO2(B) Epitaxial Electrodes for All-Solid-State Nanobatteries

Dongha Kim; Jingyeong Jeon; Joon Deok Park; Xiao-Guang Sun; Xiang Gao; Ho Nyung Lee; Judith L MacManus-Driscoll; Deok-Hwang Kwon; Shinbuhm Lee

doi:10.1021/acs.nanolett.3c00596

Stable Supercapacity of Binder-Free TiO₂(B) Epitaxial Electrodes for All-Solid-State Nanobatteries

Nano Lett. 2023 Aug 9;23(15):6815-6822. doi: 10.1021/acs.nanolett.3c00596. Epub 2023 Jul 27.

Authors

Dongha Kim¹, Jingyeong Jeon¹, Joon Deok Park², Xiao-Guang Sun³, Xiang Gao⁴, Ho Nyung Lee⁴, Judith L MacManus-Driscoll⁵, Deok-Hwang Kwon², Shinbuhm Lee¹

Affiliations

¹ Department of Physics and Chemistry and Department of Emerging Materials Science, DGIST, Daegu 42988, Republic of Korea.
² Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea.
³ Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
⁴ Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
⁵ Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.

PMID: 37499099
DOI: 10.1021/acs.nanolett.3c00596

Abstract

Owing to its pseudocapacitive, unidimensional, rapid ion channels, TiO₂(B) is a promising material for application to battery electrodes. In this study, we align these channels by epitaxially growing TiO₂(B) films with the assistance of an isostructural VO₂(B) template layer. In a liquid electrolyte, binder-free TiO₂(B) epitaxial electrodes exhibit a supercapacity near the theoretical value of 335 mA h g^-1 and an excellent charge-discharge reproducibility for ≥200 cycles, which outperform those of other TiO₂(B) nanostructures. For the all-solid-state configuration employing the LiPON solid electrolyte, excellent stability persists. Our findings suggest excellent potential for miniaturizing all-solid-state nanobatteries in self-powered integrated circuits.

Keywords: TiO2(B); all-solid-state nanobattery; electrode; long retention; pseudocapacitive intercalation; supercapacity; templated epitaxy.