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Method for improving performance of zinc-iodine battery based on halogen bond effect

A battery performance and function technology, which is applied in the direction of battery electrodes, secondary batteries, zinc-halogen accumulators, etc., to achieve the effects of stable large-scale production, improved rate performance, and cheap and easy-to-obtain raw materials

Active Publication Date: 2021-03-26
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some progress has been made by adopting this scheme, the carbon surface adsorption alone is not enough to maintain the long cycle life of the iodine cathode.

Method used

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  • Method for improving performance of zinc-iodine battery based on halogen bond effect
  • Method for improving performance of zinc-iodine battery based on halogen bond effect
  • Method for improving performance of zinc-iodine battery based on halogen bond effect

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The synthesis of embodiment 1 iodine / carbon microtube composite cathode material

[0026] (1) Synthesis of polyatomic co-doped and partially graphitized porous carbon microtubes: Weigh 1 g of hexamethylenetetramine and 0.5 g of nickel nitrate hexahydrate dissolved in 50 ml of deionized water, and in the solution Add 0.6 g of washed biomass material. The mixed solution was put into a constant temperature magnetic stirrer, stirred and heated, and reacted in liquid phase at 95° C. for 6 hours. The sample was taken out, filtered and washed, and dried at 60° C. for 12 hours to obtain the precursor material. The precursor material was placed in a tube furnace, and carbonized at 700° C. for 2 hours under an argon atmosphere. After the sample was taken out, it was soaked and washed with 1 mol / L hydrochloric acid to obtain partially graphitized polyatomic co-doped porous carbon microtubes.

[0027] (2) Synthesis of iodine / carbon microtube composites: Take an appropriate amoun...

Embodiment 2

[0029] Example 2 Preparation and Test Method of Aqueous Zinc-Iodine Battery Using Iodine / Carbon Microtube Composite Material as Positive Electrode

[0030](1) Fabrication and performance testing of the positive pole piece: the iodine / carbon microtube composite material is used as the positive pole material of the battery. After mixing the positive electrode material, conductive agent and binder in a mass ratio of 8: 1: 1, add an appropriate amount of deionized water and grind and stir evenly to obtain a black viscous slurry. The slurry was evenly coated on the graphite sheet current collector, and vacuum-dried at 60° C. for 12 hours to obtain the positive electrode sheet. The constant current charge and discharge test and cycle performance test of different current densities are carried out on the positive electrode sheet. For its performance characterization results, see figure 2 .

[0031] (2) Production of negative electrode sheet: Mix zinc / carbon composite negative ele...

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Abstract

The invention relates to a method for improving the performance of a zinc-iodine battery based on a halogen bond effect, which belongs to the technical field of aqueous batteries. Iodine serving as apositive electrode material of a zinc ion battery has the application advantages of rich reserves, high reaction activity and the like, but the thermal / electrochemical stability and conductivity of iodine are poor, so that the cycle life of the battery is seriously influenced. In order to improve the performance of an iodine positive electrode, the invention provides a method for better fixing iodine to the surface of a polyatomic doped carbon carrier by utilizing the halogen bond effect so as to enhance the stability / conductivity. The method specifically comprises the following steps of calcining a biomass material to convert the biomass material into a multi-atom doped porous carbon microtube, uniformly mixing iodine with the carbon microtube, and heating to obtain the iodine / carbon microtube composite material. The thermal stability of the compound is remarkably enhanced, and the zinc storage reversible specific capacity and the cycling stability of the compound are greatly improved. The method is simple and efficient, the obtained composite material is more stable in physicochemical property and obvious in battery performance improvement effect, and has potential practical value and commercial prospect.

Description

technical field [0001] The invention belongs to the technical field of water-based batteries, and in particular relates to a method for improving the performance of zinc-iodine batteries based on the interaction of halogen bonds. Background technique [0002] In recent years, lithium-ion batteries have dominated the field of rechargeable energy storage due to their high energy density, good cycle stability, and high energy efficiency, and are widely used in electric vehicles and various portable electronic devices. However, the shortage and high cost of resources such as lithium and cobalt, and the poisonous and flammable organic electrolyte limit the further development of lithium-ion batteries. In comparison, aqueous batteries use a non-toxic aqueous solution with high ion mobility as the electrolyte, which has the advantages of high safety, low cost, and environmental friendliness, and is expected to become a clean and efficient energy storage device. In the family of aq...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M4/38H01M4/62
CPCH01M10/365H01M4/388H01M4/625Y02E60/10
Inventor 朱建慧姚佳佳蒋建
Owner SOUTHWEST UNIVERSITY
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