Construction And Electrochemical Performances Of Ni//Bi Alkaline Micro-Battery

Due to the rapid development of electronic products and micro-devices,the demand for highly integrated micro energy storage devices with excellent electrochemical performance is increasing,and planar micro-devices with excellent energy storage performance have received great attention.Compared with micro-supercapacitors,micro-batteries have high energy density and have great application potential in the field of microelectronics and medical equipment.However,as for the traditional micro-battery,complex micro-manufacturing process and packaging technology hinder its application in the field of micro-energy storage.Therefore,it is particularly important to find a micro-battery which is environmentally friendly and low in cost to realize its miniaturization.The aqueous rechargeable nickel-bismuth micro-battery has become the focus of battery miniaturization research due to its high operational stability,wide operating potential,high capacity and environmental friendliness.However,the material structure collapses during the cycle of the nickel-bismuth micro-battery,resulting in low cycle performance.How to improve the cycle stability of the nickel-bismuth micro-battery and fabricate a nickel-bismuth micro-battery with excellent energy storage performance is the key to the miniaturization of the nickel-bismuth battery.Based on this problem,this paper aims to produce micro device with high area specific capacity,stable cycle performance and good rate performance using inexpensive materials and simple photolithography and pyrolysis processes.By combining the micromachining process with the material synthesis method,a miniature nickel-bismuth battery with a long cycle life is constructed.Then it is characterized and electrochemically measured to further analyze the principle of electrodeposition material synthesis and explore the electrochemical process of the device.The main results are as follows:?1?A planar micro-battery was fabricated by simple photolithography-development technique,physical vapor deposition process and electrochemical deposition technique.The interdigital electrode structure realized physical isolation between positive and negative electrodes and provided short ion diffusion pathway.The utilization efficiency of the active material is improved,and the controllable preparation of Bi and the nickel-cobalt double metal hydroxide is realized.?2?Electrochemical deposition was applied for the synthesis of Bi,nickel-cobalt double metal hydroxide.The controllable fabrication of the interdigital electrode was studied,and the morphology,phase and electrochemical properties of the material were analyzed by means of characterization.The effects of different additives on the morphology and energy storage properties of the bismuth-based materials were explored.The effects of annealing treatment on the morphology and cycle properties of Bi were investigated.The results show that the annealing treatment of Bi can improve the cycle performance during charge-discharge process.Different additives have a certain influence on the micro morphology of the material,and the material with large specific surface area has higher storage capacity.?3?The fabricated nickel-bismuth micro-battery exhibits a high area capacity of55.40 mC cm^-2 at a current density of 1 mA cm^-2,an energy density of 12.3?Wh cm^-2,and a power density of 0.799 mW cm^-2,which has excellent cycle performance,the capacity retention rate is 84.44%after 1000 cycles.