Cathode material for sodium-ion batteries based on manganese hexacyanoferrate: the role of the binder component |
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Authors: | Shkreba E V Apraksin R V Tolstopjatova E G Kondratiev V V |
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Institution: | 1.Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya nab., Saint Petersburg, Russia, 199034 ;2.The Ioffe Institute, Russian Academy of Science, 26 Politekhnicheskaya str., Saint Petersburg, Russia, 194021 ; |
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Abstract: | Sodium manganese hexacyanoferrate (NaMnHCF) was synthesized by a hydrothermal method and investigated as a cathode material for sodium-ion batteries. The morphology and the structure of NaMnHCF were investigated by X-ray diffraction, scanning electron microscopy, and EDX analysis. New composition of NaMnHCF cathode material for sodium-ion batteries with eco-friendly water-based binder consisting of conducting polymer poly-3,4-ethylenedioxythiopene/polystyrene sulfonate (PEDOT:PSS) dispersion and carboxymethyl cellulose (СМС) was proposed. The electrochemical properties of NaMnHCF cathode material with conductive polymer binder were investigated by cyclic voltammetry and galvanostatic charge-discharge, and the results were compared with the performance of a conventional PVDF-bound material. It was shown that the initial discharge capacity of electrodes with conductive binder is 130 mAh g−1, whereas the initial discharge capacity of PVDF-bound electrodes was 109 mAh g−1 (both at current density 120 mA g−1, values normalized by NaMnHCF mass). The material with conductive binder also has better rate capability; however, it is losing in cycling capability to the electrode composition with conventional PVDF binder. |
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