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High energy ball milling(HEBM)method was applied to synthesize Ni(OH)2 with different doped elements substitution for Ni2+.The morphology,structure and electrochemical behavior of prepared powders were studied.The results reveal that all the synthesized Ni(OH)2 particles were in sub-micron sizes and greatly agglomerated.Co-,Mg-,Fe-or Mn-doped Ni(OH)2 was of β-phase with 0.400-0.500 nm crystal interlayer distance,while Al-and Zn-doped products displayed α-phase with larger crystal interlayer spaces.The electrochemical mechanisms of synthesized Ni(OH)2 electrodes were discussed by EIS spectra.The specific capacity of Co-doped Ni(OH)2 is 245 mA·h·g-1,i.e.,60 mA·h·g-1 higher than that of Al-doped electrode,which has the highest discharging platform of a mid-voltage of 1.30 V.
The high energy ball milling (HEBM) method was applied to synthesize Ni (OH) 2 with different doped elements substitution for Ni2 +. The morphology, structure and electrochemical behavior of prepared powders were studied. The results reveal that all the synthesized Ni (OH) 2 particles were in sub-micron sizes and greatly agglomerated.Co-, Mg-, Fe-or Mn-doped Ni (OH) 2 was of β-phase with 0.400-0.500 nm crystal interlayer distance, while Al- and Zn- doped products The electrochemical mechanisms of synthesized Ni (OH) 2 electrodes were discussed by EIS spectra. The specific capacity of Co-doped Ni (OH) 2 is 245 mA · h · g-1, ie , 60 mA · h · g-1 higher than that of Al-doped electrode, which has the highest discharging platform of a mid-voltage of 1.30 V.