Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6614730 | Electrochimica Acta | 2013 | 6 Pages |
Abstract
The structural and electrochemical properties of manganese dioxide with 3Â ÃÂ 3 tunnels bearing the crystallographic structure of the mineral todorokite were investigated for use as a new cathode material for zinc ion cells. The large 3Â ÃÂ 3 tunnel of todorokite facilitates fast Zn2+ diffusion to the inner region of a particle compared to the conventional medium-sized 2Â ÃÂ 2 tunnels of cryptomelane. Todorokite was synthesized by the hydrothermal treatment of layered Na-birnessite in a concentrated Mg-containing solution according to a known method. In electrochemical studies, a promising discharge capacity of 108Â mAÂ h/g at C/2 and a good rate performance were observed in the potential range of 0.7Â V-2.0Â V. Structural and morphological analyses of the discharged and charged electrodes indicate that a reversible intercalation of zinc ions into the tunnel occurs during the discharge-charge process.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Jonghyuk Lee, Jeh Beck Ju, Won Il Cho, Byung Won Cho, Si Hyoung Oh,