論文

査読有り
2017年

Electrochemical In Situ Synthesis: A New Synthesis Route for Redox Active Manganese Oxides for Rechargeable Sodium Ion Battery through Initial Charge Process

JOURNAL OF THE ELECTROCHEMICAL SOCIETY
  • R. Kataoka
  • ,
  • M. Kitta
  • ,
  • N. Takeichi
  • ,
  • T. Kiyobayashi

164
2
開始ページ
A226
終了ページ
A230
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1149/2.0851702jes
出版者・発行元
ELECTROCHEMICAL SOC INC

Positive electrode active materials for the rechargeable sodium ion battery are in-situ synthesized during initial charge process in an electrochemical cell from precursor composites of Na2O2 and Mn3O4. Unlike the synthesis of metal oxides, e.g., alpha-NaFeO2, etc., the present materials are subjected to no heat-treatment. When beginning with a precursor composite of which the Na/Mn ratio is 1.0, the electrode delivers 194 mA h g(-1) during the subsequent discharge process. The electrode retains 84% of the initial discharge capacity after 30 cycles. X-ray diffractometry (XRD) and transmission electron microscopy identifies three phases in the precursor composite; i.e., crystalline Mn3O4 and Na2O2 as well as an amorphous phase. Ex-situ XRD reveals that Mn3O4 in the precursor transforms to lambda-MnO2 after the initial charge process as a result of the in-situ synthesis. Moreover, we also found the composite functions when the Na/Mn ratio of the composite is more than 1.0. An extra amount of Na can be provided to cancel the irreversible capacity of the negative electrode when we start from a composite of which the Na/Mn ratio is greater than 1.0, whereby we demonstrate the feasibility of a full-cell. (C) 2016 The Electrochemical Society. All rights reserved.

Web of Science ® 被引用回数 : 4

リンク情報
DOI
https://doi.org/10.1149/2.0851702jes
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000397850800120&DestApp=WOS_CPL
URL
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000397850800120&KeyUID=WOS:000397850800120
URL
http://orcid.org/0000-0002-3272-1860