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Citation: Hai WANG, Xinghui ZHOU, Zhiqiang WANG, Tian QIU, Mingyun GUAN. Intermediate phase α-β-Ni0.93Y0.07(OH)2 with high performance: Synthesis and application in nickel-zinc batteries[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(9): 2041-2050. doi: 10.11862/CJIC.20260153 shu

Intermediate phase α-β-Ni0.93Y0.07(OH)2 with high performance: Synthesis and application in nickel-zinc batteries

  • School of Chemistry and Environmental Engineering, Jiangsu University of Technology, Changzhou, Jiangsu 213001, China

  • Corresponding author: Mingyun GUAN, guanmy@jsut.edu.cn
  • Received Date: 5 May 2026
    Revised Date: 19 July 2026

Figures(6)

  • To improve the energy density and cycle stability of nickel-zinc (NiZn) batteries, the Y3+-doped Ni(OH)2(Ni1-xYx(OH)2, x=0.01, 0.03, 0.05, 0.07, 0.10, 0.15, 0.20) was successfully prepared via a hydrothermal method. X-ray diffraction (XRD) results showed that with the increase of Y3+ doping amount, the crystal phase structure of Ni1-xYx(OH)2 gradually transformed from β phase to intermediate phase α-β (Ni0.93Y0.07(OH)2), and finally to α phase (Ni0.80Y0.20(OH)2); Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations indicated that the morphology of the product transitioned from nanoparticles, nanoplates to agglomerated granules with varying doping levels. Energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) analyses confirmed that Y3+ was successfully doped into Ni(OH)2 crystal lattice and maintained stable trivalence. Electrochemical measurements including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and long-term cycling tests confirm that Ni0.93Y0.07(OH)2 delivered optimal electrochemical performance at a Y3+ doping ratio (molar ratio) of 7%. NiZn pouch cell was assembled using α-β intermediate phase-Ni0.93Y0.07(OH)2 as the cathode and zinc foil as the anode. Electrochemical testing showed that it retained an energy density of 182.03 Wh·kg-1 and maintained Coulombic efficiency above 94% after 1 600 cycles, outperforming cells fabricated with undoped Ni(OH)2(β-Ni(OH)2) cathodes.
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