Effective Ru/CNT Cathode for Rechargeable Solid-State Li-CO2 Batteries

Kirankumar Venkatesan Savunthari; Chien-Hung Chen; You-Ruei Chen; Zizheng Tong; Kevin Iputera; Fu-Ming Wang; Chun-Chuan Hsu; Da-Hua Wei; Shu-Fen Hu; Ru-Shi Liu

doi:10.1021/acsami.1c11000

Effective Ru/CNT Cathode for Rechargeable Solid-State Li-CO₂ Batteries

ACS Appl Mater Interfaces. 2021 Sep 22;13(37):44266-44273. doi: 10.1021/acsami.1c11000. Epub 2021 Sep 8.

Authors

Affiliations

¹ Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
² Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan.
³ Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan.
⁴ Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
⁵ R&D Center for Membrane Technology, Chung Yuan Christian University, Taoyuan 320, Taiwan.
⁶ Sustainable Energy Center, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
⁷ Department of Chemical Engineering, Chung Yuan Christian University, Taoyuan 320, Taiwan.

PMID: 34494812
DOI: 10.1021/acsami.1c11000

Abstract

An effective Ru/CNT electrocatalyst plays a crucial role in solid-state lithium-carbon dioxide batteries. In the present article, ruthenium metal decorated on a multi-walled carbon nanotubes (CNTs) is introduced as a cathode for the lithium-carbon dioxide batteries with Li_1.5Al_0.5Ge_1.5(PO₄)₃ solid-state electrolyte. The Ru/CNT cathode exhibits a large surface area, maximum discharge capacity, excellent reversibility, and long cycle life with low overpotential. The electrocatalyst achieves improved electrocatalytic performance for the carbon dioxide reduction reaction and carbon dioxide evolution reaction, which are related to the available active sites. Using the Ru/CNT cathode, the solid-state lithium-carbon dioxide battery exhibits a maximum discharge capacity of 4541 mA h g^-1 and 45 cycles of battery life with a small voltage gap of 1.24 V compared to the CNT cathode (maximum discharge capacity of 1828 mA h g^-1, 25 cycles, and 1.64 V as voltage gap) at a current supply of 100 mA g^-1 with a cutoff capacity of 500 mA h g^-1. Solid-state lithium-carbon dioxide batteries have shown promising potential applications for future energy storage.

Keywords: LAGP solid electrolyte; Ru nanoparticles; Ru/CNT cathode; and Li-metal anode; solid-state Li−CO2 batteries.