Todorokite-type MnO2 as a zinc-ion intercalating material
- Todorokite-type MnO2 as a zinc-ion intercalating material
- 이종혁; 주제백; 조원일; 조병원; 오시형
- zinc-ion battery; cathode material; manganese dioxide; todorokite; intercalation
- Issue Date
- Electrochimica acta
- VOL 112, 138-143
- The structural and electrochemical properties of manganese dioxide with 3 × 3 tunnels bearing the crys-tallographic structure of the mineral todorokite were investigated for use as a new cathode material forzinc ion cells. The large 3 × 3 tunnel of todorokite facilitates fast Zn2+diffusion to the inner region ofa particle compared to the conventional medium-sized 2 × 2 tunnels of cryptomelane. Todorokite wassynthesized by the hydrothermal treatment of layered Na-birnessite in a concentrated Mg-containingsolution according to a known method. In electrochemical studies, a promising discharge capacity of108 mA h/g at C/2 and a good rate performance were observed in the potential range of 0.7 V–2.0 V.Structural and morphological analyses of the discharged and charged electrodes indicate that a reversibleintercalation of zinc ions into the tunnel occurs during the discharge–charge process.
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