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Correlation of Structural Disorder with the Reversible Discharge Capacity of Nickel Hydroxide Electrode

2005; Institute of Physics; Volume: 152; Issue: 4 Linguagem: Inglês

10.1149/1.1865852

1945-7111

T. N. Ramesh, P. Vishnu Kamath, C. Shivakumara,

Gas Sensing Nanomaterials and Sensors

Hydrothermal treatment of a slurry of badly crystalline nickel hydroxide at different temperatures (65-170°C) results in the progressive ordering of the structure by the step-wise elimination of disorders. Interstratification is eliminated at 140°C, while cation vacancies are eliminated at 170°C. A small percentage of stacking faults continue to persist even in 'crystalline' samples. Electrochemical investigations show that the crystalline nickel hydroxide has a very low (0.4 e/Ni) reversible charge storage capacity. An incidence of at least 15% stacking faults combined with cation vacancies is essential for nickel hydroxide to perform close to its theoretical (1 e/Ni) discharge capacity.