Abstract
Lamellar Ni3Si prepared by the combination of directional solidification and selective corrosion was proved to be a battery-type material. Its areal capacity is decreased with the increasing directional solidification growth rate, which is due to decreasing the lamellar space hinders the matter exchange between electrodes and the electrolyte. When the discharge current is 5 mA, the areal capacity of Ni3Si electrode with growth rate of 8 μm/s is 0.2 mAhcm−2, meanwhile the areal capacity of Ni3Si electrode with growth rate of 10 μm/s is only 0.16 mAhcm−2. After 1000 cycles of consecutive charge and discharge, the capacity loss of Ni3Si electrode with growth rate of 10 μm/s is the smallest, only 16.4%. Therefore, 10 μm/s is the optimal choice for preparing Ni3Si electrodes, after synthetically considering both the areal capacity and cyclic stability. Hopefully, this paper can provide a candidate material preparation of Ni-based battery or Li+ and Na+ batteries.
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