Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 52, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/JJAP.52.090202
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Funding
- Canon Foundation
- Mitsubishi Foundation
- Ministry of Education, Culture, Sports, Science and Technology, Japan [25620036]
- Photon Factory Program Advisory Committee [2013G068]
- Grants-in-Aid for Scientific Research [25620036] Funding Source: KAKEN
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Electronic state of cobalt and manganese Prussian blue analogues were systematically investigated against Na+ intercalation by means of the infrared and X-ray absorption spectroscopies. The spectroscopies revealed that 3.8 and 3.4 V plateaus in the discharge curve of NaxCo[Fe(CN)(6)](0.90)2.9H(2)O (denoted as NCF90) are ascribed to the reduction processes of Fe3+ and Co3+, respectively. On the other hand, 3.6 and 3.2V plateaus of NaxMn[Fe(CN)(6)](0.83)3.5H(2)O (NMF83) are ascribed to the reduction processes of Mn3+ and Fe3+, respectively. We found that the film electrodes with a thickness of 1.1 mu m exhibit fast Na+ intercalations: the discharge capacity at 60 C of the NCF90 (NFM83) film was 90% (45%) of the open-circuit-voltage (OCV) value. Thus, Prussian blue analogue films are promising cathode candidates for sodium-ion secondary batteries. (C) 2013 The Japan Society of Applied Physics
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