Three different methods were used to produce α-Ni(OH) 2 with higher discharge capacities than the conventional β-Ni(OH) 2 , specifically a batch process of co-precipitation, a continuous process of co-precipitation with a phase transformation step (initial cycling), and an overcharge at low temperature. All three methods can produce α-Ni(OH) 2 or α/β mixed-Ni(OH) 2 with capacities higher than that of conventional β-Ni(OH) 2 and a stable cycle performance. The second method produces a special core-shell β-Ni(OH) 2 /α-Ni(OH) 2 structure with an excellent cycle stability in the flooded half-cell configuration, is innovative and also already mass-production ready. The core-shell structure has been investigated by both scanning and transmission electron microscopies. The shell portion of the particle is composed of α-Ni(OH) 2 nano-crystals embedded in a β-Ni(OH) 2 matrix, which helps to reduce the stress originating from the lattice expansion in the β-α transformation. A review on the research regarding α-Ni(OH) 2 is also included in the paper.

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LiCoO2; Co-doping; Multi-element; Cycle performance; Stability

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