Journal
ELECTROCHIMICA ACTA
Volume 210, Issue -, Pages 963-969Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.05.205
Keywords
Sodium-ion secondary battery; Cathode material; Manganese-hexacyanoferrate; Jahn-Teller instability
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Manganese hexacyanoferrate (Mn-HCF) is a promising cathode material for sodium-ion secondary batteries (SIBs). We investigated the effects of partial substitution of Fe, Co, and Ni for Mn in Mn-HCF on the SIB rate and cycle performance. The discharge capacity is discernible at 50C in the substituted samples, while it disappears at 20C in the non-substituted samples. We ascribed the enhancement of the rate performance to the suppression of the Jahn-Teller distortion of Mn3+ and the resultant activation of the Mn reduction reaction. (C) 2016 Elsevier Ltd. All rights reserved.
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