Fabrication of Na0.7MnO2/C composite cathode material by simple heat treatment for high-power na-ion batteries

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A Na0.7MnO2/C composite cathode material is synthesized by simple and costeffective two-step heat treatment for an improvement in the rate capability of Na0.7MnO2. The first heat treatment is to synthesize Na0.7MnO2, and the second one is a low temperature annealing at 350 A degrees C for 1 h in air, which is necessary to suppress an interfacial reaction between the Na0.7MnO2 and C in the synthesis process of Na0.7MnO2/C composite. Structural analyses by XRD and XPS reveal that the Na0.7MnO2/C shows the same structural properties as that of the pristine Na0.7MnO2, and hence they exhibit the same initial discharge capacity of 175 mAh g(-1) at 20 mA g(-1). At a current density of 400 mA g(-1), the discharge capacity of Na0.7MnO2 reduces to 50 mAh g(-1) (28% of the initial discharge capacity), whereas that of Na0.7MnO2/C reduces to 108 mAh g(-1) (61% of the initial discharge capacity). The enhanced rate capability of the Na0.7MnO2/C is attributed to the conductive carbon layer formed on the surface of Na0.7MnO2 particles, enabling the facile transport of electrons from the current collector to the surface of the Na0.7MnO2 particles.
Publisher
KOREAN INST METALS MATERIALS
Issue Date
2018-01
Language
English
Article Type
Article
Keywords

MANGANESE OXIDES; ELECTROCHEMICAL PERFORMANCE; ENERGY-STORAGE; P2-TYPE; ELECTRODES; MORPHOLOGY; BEHAVIOR

Citation

ELECTRONIC MATERIALS LETTERS, v.14, no.1, pp.30 - 36

ISSN
1738-8090
DOI
10.1007/s13391-017-7085-6
URI
http://hdl.handle.net/10203/238159
Appears in Collection
MS-Journal Papers(저널논문)
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