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Cobalt Hexacyanoferrate as Cathode Material for Na+ Secondary Battery

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Published 31 January 2013 • ©2013 The Japan Society of Applied Physics
, , Citation Masamitsu Takachi et al 2013 Appl. Phys. Express 6 025802 DOI 10.7567/APEX.6.025802

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1 Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

2 Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

Dates

  1. Received 7 January 2013
  2. Accepted 14 January 2013
  3. Published

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Abstract

We investigated structural and electrochemical properties of thin film electrodes of cobalt hexacyanoferrate, NaxCo[Fe(CN)6]0.902.9H2O, against x. The compound exhibits a high capacity of 135 mAh/g and an average operating voltage of 3.6 V against Na, with a good cyclability. The discharge curve exhibits two plateaus at ≈3.8 and ≈3.4 V, which are ascribed to the reduction processes of Fe3+ and Co3+, respectively. The ex situ X-ray diffraction (XRD) profiles reveal the robust nature of the host framework against Na+ intercalation/deintercalation. Thus, cobalt hexacyanoferrate is a promising candidate for the cathode material of sodium-ion secondary battery (SIB).

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10.7567/APEX.6.025802