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Aqueous zinc-iodine battery based on four-electron conversion reaction and electrolyte thereof

A zinc-iodine battery and electrolyte technology, which is applied in the directions of aqueous electrolyte, secondary battery, and secondary battery repair/maintenance, can solve the problems of unsatisfactory electrochemical performance, unsatisfactory zinc-iodine battery capacity and energy density, etc. Improve the four-electron conversion reaction activity of I-/I2/I+, improve the electrochemical performance, and avoid the effect of hydrolysis

Active Publication Date: 2020-08-14
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the unsatisfactory capacity and energy density of zinc-iodine batteries, the first purpose of the present invention is to provide a water-based zinc-iodine battery electrolyte that can realize a high-capacity four-electron conversion reaction. - / I 2 / I + The Four-Electron Conversion Reaction Mechanism in the Electrolyte of Aqueous Zinc-Iodine Batteries
[0006] In order to solve the existing zinc iodine secondary battery positive electrode is based on I - / I 2 Conversion mechanism, the problem of unsatisfactory electrochemical performance, the present invention proposes a method based on I for the first time in the industry - / I 2 / I + However, in order to realize this new discharge mechanism for the first time in the industry and successfully obtain a zinc-iodine secondary battery with high electrochemical performance, it is necessary to properly solve the I + The problems of hydrolysis, stability and reactivity in aqueous solution system

Method used

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  • Aqueous zinc-iodine battery based on four-electron conversion reaction and electrolyte thereof
  • Aqueous zinc-iodine battery based on four-electron conversion reaction and electrolyte thereof
  • Aqueous zinc-iodine battery based on four-electron conversion reaction and electrolyte thereof

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Embodiment 1

[0072] Add 300mg of high specific surface area activated carbon and 100mg of elemental iodine into 20ml of deionized water and mix, seal and heat to 60°C for 12h, then centrifuge the suspension at 5000 rpm, discard the supernatant, and heat-treat the lower mixture in an oven at 60°C After 12h, the iodine-activated carbon complex was obtained as the active material. The active material, SuperP, and CMC were mixed in a mass ratio of 8:1:1 and added with water to grind into a slurry, which was coated on a titanium foil and dried at 60°C to obtain a positive electrode sheet. The negative pole is a clean zinc flake. Electrolyte is ZnCl 2 :LiCl:ACN:H 2 O The aqueous solution (ZnCl 2 Molar concentration is 19M; LiCl molar concentration is 19M; ACN molar concentration is 8M). Assemble into a Swagelok battery. at 400mAg -1 The charge-discharge curve at current density is shown in figure 1 .

Embodiment 1-1

[0076] Compared with Example 1, the difference is that the electrolyte is pure zinc chloride aqueous solution: 10MZnCl 2 ; The rest of the steps are the same; at 400mAg -1 The charge-discharge curve at current density is shown in image 3 .

Embodiment 1-2

[0078] Compared with Example 1, the difference is that the electrolyte is 1MZnSO4+10MLiCl aqueous solution (changing the Zn source). at 400mAg -1 The charge-discharge curve at current density is shown in Figure 4 .

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Abstract

The invention belongs to the technical field of zinc-iodine batteries, particularly provides a four-electron conversion iodine-based electrochemical reaction aqueous zinc-iodine battery, and further discloses an electrolyte capable of realizing four-electron conversion. The electrolyte is an aqueous solution containing Zn<2+> and I<+> stabilizers, wherein the total molar concentration of the Zn<2+> and I<+> stabilizers is not lower than 5M; in addition, the electrolyte further selectively contains an organic solvent. Based on the brand-new conversion mechanism, the performance bottleneck of the existing zinc-iodine battery can be broken through, and the electrochemical performance is effectively improved.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to a four-electron conversion reaction aqueous zinc-iodine battery and a method for preparing an electrolyte thereof. Background technique [0002] In the current energy storage system, the organic electrolyte (lithium / sodium / potassium ion battery, etc.) has a sufficiently wide electrochemical window, so that it can theoretically achieve a higher energy density. Among them, lithium-ion batteries (LIBs) have been widely used in consumer electronics and new energy vehicles since their introduction in 1990 due to their advantages of high energy density and long cycle life. However, the key to the high energy density of lithium-ion batteries—the cost of positive electrode ternary materials remains high, and the storage and mining limitations of negative electrode lithium, coupled with the inherent toxicity and flammability of traditional organic solvents in the electrol...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/36
CPCH01M10/0567H01M10/36H01M10/4235H01M2300/0002Y02E60/10
Inventor 梁宵邹一平
Owner HUNAN UNIV
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