Design And Performance Of Zn-air/ZnNi Hybrid Battery

Zn-air battery have the advantages of high energy density,low cost and good safety,while the ZnNi battery have the advantages of high cell voltage and high rate charge/discharge.To combine the Zn-air battery and ZnNi battery,a new type hybrid battery has been formed which simultaneously possesses the dual battery characteristics of the above two kinds batteries.This provides a new idea for the research of a new energy vehicle power battery.But the key problem to release the dual battery characteristics of the Zn-air/ZnNi hybrid battery,is the preparation of the high performance electrode materials with bifunctional activity.Firstly,a series of Co@NC-X nanomaterials with oxygen reduction/oxygen evolution reaction（ORR/OER）catalytic activity are designed and synthesized to satisfy the performance requirement of Zn-air battery at the anode.Secondly,aiming at satisfying the performance requirement of ZnNi battery at the cathode,a new type composite electrode of Co@NC-850/Ni（OH）₂ is further designed and synthesized based on Co@NC-850 which shows the best activity during the ORR and OER.Thirdly,a planar vertical structure of Zn-air/ZnNi hybrid battery system is designed and applied on the basis of battery design criteria.Thus,the hybrid battery performance of Co@NC-850/Ni（OH）₂ composite electrode is definitely studied in the above battery system.The specific content of the full text is shown in the following:（1）A series of Co@NC-X nanomaterials with ORR and OER catalytic function are synthesized by the chemical liquid-phase and high-temperature calcination method.According to the results of material characterization and electrochemical test,it can be seen that the temperature of calcining reaction has a great influence on the morphology,microstructure and electrocatalytic acitivity of the Co@NC-X nanomaterials.When the calcining temperature is850°C,the Co@NC-850 shows the best ORR and OER activity simultaneously.Furthermore,on the basis of Co@NC-850,a new type of Co@NC-850/Ni（OH）₂ composite nanomaterials is further synthesized.The Co@NC-850/Ni（OH）₂ not only shows the ORR and OER activity to afford the requirements of Zn-air battery,but also exhibits the oxidation-reduction capability which is required for Zn Ni battery.（2）The research on the structure of hybrid battery is developed.A planar vertical structure of Zn-air/ZnNi hybrid battery system is designed and applied on the basis of battery design criteria.Moreover,the performance of the Co@NC-850/Ni（OH）₂ composite electrode is definitely studied in the above battery system.The actual discharge performance of the hybrid battery is measured by a small power LED lamp and a large power desk lamp fan.The hybrid battery not only exhibits the dual battery characteristics of Zn-air battery and Zn Ni battery,but also shows the characteristics of high voltage,high power density and high energy density.