Lee, Jonghyuk Ju, Jeh Beck Cho, Won Il Cho, Byung Won Oh, Si Hyoung 2024-01-20T11:01:22Z 2024-01-20T11:01:22Z 2021-09-05 2013-12-01 0013-4686 https://pubs.kist.re.kr/handle/201004/127346 The structural and electrochemical properties of manganese dioxide with 3 x 3 tunnels bearing the crystallographic structure of the mineral todorokite were investigated for use as a new cathode material for zinc ion cells. The large 3 x 3 tunnel of todorokite facilitates fast Zn2+ diffusion to the inner region of a particle compared to the conventional medium-sized 2 x 2 tunnels of cryptomelane. Todorokite was synthesized by the hydrothermal treatment of layered Na-birnessite in a concentrated Mg-containing solution according to a known method. In electrochemical studies, a promising discharge capacity of 108 mA h/g at C/2 and a good rate performance were observed in the potential range of 0.7 V-2.0 V. Structural and morphological analyses of the discharged and charged electrodes indicate that a reversible intercalation of zinc ions into the tunnel occurs during the discharge-charge process. (C) 2013 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD MANGANESE OXIDE CATHODE BATTERIES BEHAVIOR Todorokite-type MnO2 as a zinc-ion intercalating material Article 10.1016/j.electacta.2013.08.136 1 ELECTROCHIMICA ACTA, v.112, pp.138 - 143 ELECTROCHIMICA ACTA 112 138 143 scie scopus 000329886100019 2-s2.0-84884299413 Electrochemistry Electrochemistry Article; Proceedings Paper MANGANESE OXIDE CATHODE BATTERIES BEHAVIOR Zinc-ion battery Cathode material Manganese dioxide Todorokite Intercalation