Rational design towards Zn-based anode for dendrite-free and durable alkaline Ni-Zn batteries

作者：Liu, Yuxiu; Li, Luping; Ji, Xu; Yang, Lexuan; Li, Juan; Cheng, Shuang^*

来源：Journal of Alloys and Compounds, 2023, 960: 170978.

DOI：10.1016/j.jallcom.2023.170978

• Alkaline Ni-Zn batteries
• Zn-based anode
• Carbon coating
• Dendrite free
• Ga-doping

Alkaline Ni-Zn batteries have gained great scientific and industrial interest. However, Zn-based anodes still suffer from serious challenges, mainly including Zn dendrites, hydrogen evolution reaction (HER), corrosion, deformation, and passivation. Herein, an effective strategy is proposed to overcome/alleviate these chal-lenges: First, micron-sized ZnO with spherical structure that can minimize the property difference induced by anisotropy and the surface area exposed to the alkaline electrolyte is prepared as active materials; Second, Ga is introduced into the matrix of ZnO to increase the initial conductivity; Third, thin carbon layer is coated onto the ZnO to further enhance the conductivity and prevent its direct contact with the severe electrolyte. The optimal material of carbon coated Ga-doping ZnO (GZO@C) can deliver a rather high ca-pacity of & SIM; 632 mAh g-1 (charged with a theoretical value of 659 mAh g-1, 100 % depth of discharge), reflecting low proportion of HER concerned side reactions. The capacity is well maintained for about 1300 cycles at 4.0 A g-1. There is no obvious capacity decay along with the increase of charge/discharge current, indicating good rate performance. Morphology change of the active materials is also restrained, suggesting the avoidance of Zn dendrites and deformation.& COPY; 2023 Elsevier B.V.

• 单位
  仲恺农业工程学院