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Aqueous zinc-bromine battery

A zinc-bromine battery and water-based electrolyte technology, which is applied in the field of electrochemical energy storage, can solve the problems of poor battery reversibility, low coulombic efficiency, and unstable cycle, so as to avoid the formation of zinc dendrites, improve reversibility, and improve battery performance. The effect of stability

Pending Publication Date: 2022-01-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For above-mentioned technical problem, the present invention has designed a kind of water system Zn-Br 2 Battery, used to improve technical problems such as poor battery reversibility, cross-contamination, low Coulombic efficiency and cycle instability

Method used

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Examples

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Embodiment 1

[0032] The aqueous zinc-bromine battery provided in this embodiment includes a positive electrode, a negative electrode, and an aqueous electrolyte. specific:

[0033] The positive current collector is a carbon felt modified by Ketjen black with a large specific surface area, and the specific surface area of ​​Ketjen black is about 2000m 2 / g. The specific preparation method is: mix Ketjen Black, binder PVED, and solvent NMP at a mass ratio of 0.16:0.04:40 (the ratio can be adjusted to 0.0001~5:0.0001~3:40), and then use a rubber dropper to evenly Drop it on the carbon felt, and dry it in an oven at 80°C (the temperature can be adjusted to 40-160°C) for 12h (the time can be adjusted to 4-40h).

[0034] The negative electrode is copper plated with metal antimony, and the antimony electroplating solution is 0.06mol / L SbCl 3 +4mol / L concentrated sulfuric acid (the ratio can be adjusted to (0.000001~0.08)mol / L SbCl 3 +(4~16)mol / LH 2 SO 4 ), place the polished copper sheet in...

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Abstract

The invention discloses an aqueous zinc-bromine battery, and the battery comprises a positive electrode, wherein the positive electrode is a carbon, metal or nonmetal matrix material modified by a carbon material with a high specific surface area and is used for carrying out an oxidation-reduction reaction of zero-valent bromine and negative monovalent bromine, and the electrode can provide more sites for an active substance, so the improvement of the reversibility of electrode reaction is facilitated, and high loading capacity can be realized; a negative electrode which adopts a metal material capable of being alloyed with zinc or a zinc-loving carbon material and is used for carrying out redox reaction of positive divalent zinc and zero-valent zinc, wherein the electrode material can reduce a nucleation energy barrier of zinc and homogenize a surface electric field, so the reversibility of the reaction is improved and formation of zinc dendrites is avoided; an aqueous electrolyte which is an aqueous solution containing a zinc salt, a bromine salt, a complexing agent and a zinc dendritic crystal inhibitor, wherein the complexing agent and the bromine elementary substance are combined at the positive electrode and exist in a solid form, so that pollution to the negative electrode can be avoided, the battery stability is improved, and the zinc dendritic crystal inhibitor can avoid formation of zinc dendritic crystals of the negative electrode, so the cycle stability of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a water system Zn-Br 2 Battery. Background technique [0002] With the development of human beings and the increasing demand for energy, the development of renewable energy is imminent. But because of their random and intermittent nature, feeding them directly into the grid can be disruptive. A rechargeable battery is a very efficient electrochemical energy storage device, which can effectively adjust the frequency of the grid in combination with the introduction of electricity to compensate for the intermittent and random nature of renewable energy. [0003] The widely studied aqueous Zn-Br 2 Batteries are cheap, non-polluting, high safety and high stability, and are regarded as the most promising large-scale energy storage technology for the next generation. However, in the traditional zinc-bromine flow battery, due to the problems of low active area ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M4/62
CPCH01M10/38H01M4/628Y02E60/10Y02P70/50
Inventor 陈维郑新华
Owner UNIV OF SCI & TECH OF CHINA
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