Study On Synthesis And Modification Of Polyaniline As Cathode Material For Zinc-ion Battery

Due to the safety issues and resource shortages of lithium-ion batteries,the development of a new generation of energy storage devices as alternatives has aroused increasing research interest.Aqueous rechargeable zinc batteries have entered the vision of researchers as one of the most promising alternatives.Among the variety of cathode materials,organic polymer cathode materials with excellent adjustable morphology and a large number of active sites are an important direction in the research field of zinc-ion batteries.The experiment explored the electrochemical performance of PANI materials in different synthesis environments,optimized the electrolyte performance of zinc polyaniline batteries,and studied the relative performance of metal compounds as PANI modified materials.In the first part of the experiment,acetylene black(ACET)was used as the template material,and the PANI/ACET composite material doped with acid was synthesized in two acidic environments of hydrochloric acid and sulfuric acid by chemical oxidation,and ammonia water was used to dedoping it.Then eigenstate PANI/ACET composite material is obtained.The material was physically characterized observed by SEM,XRD,FT-IR and other means.The material was prepared into a soft pack battery.Then using an electrochemical workstation and a constant current charge-discharge instrument for electrochemical characterization.The results show that PANI materials can be successfully synthesized in both acidic environments.In contrast,the doped PANI material synthesized in the HCl environment has a higher porosity and a more uniform material morphology.In addition,the cycle life of the PANI/ACET zinc battery using HCl doped materials reaches more than 80 cycles,and the specific capacity reaches 80 m Ah/g,which is better than the 40 cycles cycle life and the specific capacity of 60 m Ah/g of batteries made of H₂SO₄doped materials.Secondly,in order to further improve the cycle stability of the zinc polyaniline battery.Add gelatin with stable chemical properties and a large voltage tolerance range to the electrolyte as a dendrite inhibitor for the battery system,and add Ac/Na Ac as the p H buffer solution of the electrolyte.Experiments have determined that the gelatin addition amount is 3.5 g/L and the Ac/Na Ac buffer solution addition amount is 3 mol/L can achieve the best performance improvement effect,and the battery assembled with the improved electrolyte has a capacity of 90 m Ah/g,The cycle life exceeds 700 times,and the average coulombic efficiency exceeds 98%.Finally,in order to further improve the performance of PANI,the transition metal compound nano-Ti C was used to modify the material,and the synthesized material was observed by SEM,XRD,and FT-IR to physically characterized.The PANI/Ti C composite material presents a core-shell structure with a large particle size Ti C as the coating and a small particle size Ti C embedded on the surface.The PANI material is uniformly distributed and the surface exhibits the characteristics of high porosity.The zinc polyaniline battery assembled with PANI/Ti C material was tested for constant current charging and discharging.The battery system showed high rate charging and discharging capability,and it could still maintain a specific capacity of 80 m Ah/g under the 1 C discharge system.The battery assembled with the PANI/Ti C composite material with the Ti C addition amount of 10%,under the 0.1 C discharge current,the average specific capacity of the battery in the first ten cycles reached 85 m Ah/g,and the cycles life reaches 750.Demonstrates the excellent electrochemical performance of PANI/Ti C composite materials in zinc ion batteries.PANI/MOF materials also show excellent specific capacity performance of 100m Ah/g.CL-PANI/MOF materials prepared by synthesize cross-linking agents have a special three-dimensional network structure,showing huge market application potential.