La/Ce-doping spherical α-Ni(OH)2 with high discharge capacity and long cycling durability for nickel metal hydride batteries
The currently used β -Ni(OH) 2 for alkaline nickel batteries are falling short of higher capacity demand. In contrast, α -Ni(OH) 2 with high theoretical capacity can address this need. However, the α -Ni(OH) 2 suffers from poor stability and intrinsic low electrical conductivity. Herein, we designed La/Ce-doped spherical α -Ni(OH) 2 and study the effect of La/Ce on the structure and electrochemical properties of α -Ni(OH) 2 . The increased specific surface area of the α -Ni(OH) 2 with La/Ce doping reduces the electron transfer resistance. The La/Ce-doped α -Ni(OH) 2 with 2 at% La (Ni-La-2) and 3 at% Ce (Ni-Ce-3) doping deliver high capacities of ∼365 mAh g –1 and ∼373 mAh g –1 , respectively, which is only 309 mAh g –1 for the pure α -Ni(OH) 2 . Meanwhile, the La/Ce-doping stabilizes the structural robustness of the α -Ni(OH) 2 during cycling. Notably, Ni-La-2 shows a superior stable cycling life with a capacity retention of ∼95 % after 400 cycles, which is ∼20 % higher than that of pure α -Ni(OH) 2 .
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