Journal
JOURNAL OF POWER SOURCES
Volume 112, Issue 2, Pages 428-434Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-7753(02)00396-8
Keywords
nickel hydroxide; alkaline storage batteries; structural characteristics; chemical precipitation reaction
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The effects of precipitation pH values on the microstructural characteristics of nickel hydroxide material, synthesized by a chemical precipitation method have been studied. The relationship between structural characteristics and electrochemical activity of nickel hydroxide was also examined. The structural characteristics of the synthesized beta-Ni(OH)(2), such as degree of crystallinity, crystalline lattice disorders, crystallite size and crystal growth orientation were strongly related to the pH values of the chemical precipitation reaction. The amounts of SO42-, CO32- and H2O adsorbed in crystals, and the thermal stability of the beta-Ni(OH)(2) also depended on the pH. Under relatively high pH values, the synthesized nickel hydroxide materials possessed a reduced crystallite size and lower thermal stability. more crystalline defects and a higher Ni composition. All these characteristics were likely to improve the electrochemical activity of nickel hydroxide. (C) 2002 Elsevier Science B.V. All rights reserved.
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