Synthesis and high-temperature performance of Ti substituted α-Ni（OH）₂

【Abstract】 Ti substituted α-Ni（OH）₂（c=2.121nm, a =0.307nm） with perfect high-temperature performance was prepared by the co-precipitation method. The effects of Ti addition on the structure and the electrochemical properties were investigated. The results indicate that the substitution of Ti for Ni leads to the conversion of β-Ni（OH）₂ to α-Ni（OH）₂ and the increase of the inter layer distance along c-axis from 0.464nm to 0.707nm. Infrared study reveals that more anions（SO²-₄ and CO²-₃ ions） and H₂O exist in the Ti substituted α-Ni（OH）₂. The discharge capacity of the Ti substituted α-Ni（OH）₂ is 210mA·h/g at 20℃ and reaches up to 270mA·h/g at 80℃ owing to the inhibition of the oxygen evolution at high temperature.更多还原