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Application of mixture of carbon material and ionic bromide and aqueous zinc-bromine double-ion battery

A bromide and ion-type technology, applied in the field of electrochemistry, can solve the problems of hindering the normal deposition and dissolution of zinc, poor cycle performance, poor kinetics, etc., and achieve high efficiency and reversibility of the deposition and dissolution process, long cycle life and stable operation Sexual, efficient and reversible deposition and dissolution effects

Active Publication Date: 2021-01-19
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, insoluble ZnO and Zn(OH) will be produced on the surface of the zinc anode active material during charging and discharging of the aqueous zinc-ion battery. 2 Such substances hinder the normal deposition and dissolution of zinc, increase the polarization of the battery, and reduce the charge and discharge coulombic efficiency of the battery (usually less than 90%), and the cycle performance deteriorates
On the other hand, the currently reported cathode active materials for zinc-ion batteries also have the problems of complex process, high cost, poor kinetics and poor cycle performance.

Method used

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  • Application of mixture of carbon material and ionic bromide and aqueous zinc-bromine double-ion battery
  • Application of mixture of carbon material and ionic bromide and aqueous zinc-bromine double-ion battery
  • Application of mixture of carbon material and ionic bromide and aqueous zinc-bromine double-ion battery

Examples

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Effect test

Embodiment 1

[0041] This embodiment provides a Zn | saturated ZnCl 2 Aqueous solution|ZnBr 2 - Natural graphite battery. The negative electrode active material of the battery is metal Zn foil with a thickness of 0.1mm. The electrolyte is configured at 25°C: add 432g ZnCl to 100g pure water 2 Get saturated ZnCl 2 After the aqueous solution, an additional 21.5 g of ZnCl was added 2 , to get supersaturated ZnCl 2 aqueous solution. Cathode ZnBr 2 1. A thin film electrode made by uniformly mixing natural graphite powder (particle size less than 10um) and PTFE binder at a mass ratio of 1.27:1:0.1 (the molar ratio of bromine atoms to carbon atoms in graphite is 0.95:7). When assembling the battery, the film-shaped positive electrode, glass fiber separator (trade name: Whatman) and metal Zn foil are sequentially sandwiched in the air, and the electrolyte solution (4g / Ah) is added dropwise to the glass fiber separator to completely soak it. Positive and negative electrodes, after which the ...

Embodiment 2

[0044] This embodiment provides a Zn|ZnCl 2 Saturated Aqueous Solution | NaBr-Natural Graphite Battery. The active material of the negative electrode of the battery is galvanized copper foil, the thickness of the copper foil is 10um, and the thickness of the galvanized layer is about 5um. The electrolyte configuration process is the same as in Example 1. The positive electrode is a film made by uniformly mixing NaBr, natural graphite powder (particle size less than 10um) and PVDF binder at a mass ratio of 1.16:1:0.1 (the molar ratio of bromine atoms to carbon atoms in graphite is 0.95:7) electrode. When assembling the battery, a film-shaped positive electrode, glass fiber separator (trade name: Whatman) and galvanized copper foil are sequentially sandwiched in the air, and an electrolyte solution (7.1g / Ah) is added dropwise to the glass fiber separator to make it The positive and negative electrodes were completely wetted, after which the battery was sealed and the electroc...

Embodiment 3

[0047] This embodiment provides a Zn | saturated ZnCl 2 Aqueous solution|MgBr 2 - Natural graphite battery. The active material of the negative electrode of the battery is galvanized copper foil, the thickness of the copper foil is 10um, and the thickness of the galvanized layer is about 5um. The electrolyte configuration process is the same as in Example 1. Cathode MgBr 2 1. A thin film electrode made by uniformly mixing natural graphite powder (particle size less than 10um) and PVDF binder at a mass ratio of 1.04:1:0.1 (the molar ratio of bromine atoms to carbon atoms in graphite is 0.95:7). When assembling the battery, a film-shaped positive electrode, glass fiber separator (trade name: Whatman) and galvanized copper foil are sequentially sandwiched in the air, and an electrolyte solution (7.1g / Ah) is added dropwise to the glass fiber separator to make it The positive and negative electrodes were completely wetted, after which the battery was sealed and the electrochemi...

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Abstract

The invention provides an application of a mixture of a carbon material and an ionic bromide in a battery positive electrode active material of an aqueous electrolyte. The invention also provides an aqueous zinc-bromine double-ion battery which comprises a positive electrode active material, a negative electrode active material and an electrolyte, wherein the positive electrode active material comprises a mixture of a carbon material and an ionic bromide. The electrolyte comprises a saturated ZnCl2 aqueous solution. The battery provided by the invention has relatively long cycle life and operation stability. The deposition and dissolution processes of the metal Zn negative electrode active material in the saturated ZnCl2 hydrate adopted by the invention are very efficient and reversible, and dendritic crystal growth risks are avoided, and therefore the negative electrode side has good operation stability. The battery disclosed by the invention is high in safety and environment-friendly. The battery disclosed by the invention is low in cost and relatively high in energy density.

Description

technical field [0001] The invention belongs to the field of electrochemistry. Specifically, the present invention relates to the application of a mixture of carbon material and ionic bromide and an aqueous zinc-bromine double ion battery. Background technique [0002] With the rapid development of my country's economy, the efficient utilization of existing energy output and the development of new renewable energy have become important contents of energy structure upgrading. The importance of large-scale electric energy storage technology as a key supporting technology in the upgrading of energy structure has become increasingly prominent. Among many battery energy storage technologies, zinc-ion batteries with aqueous electrolytes are very suitable for large-scale grid-scale energy storage applications due to their high safety and low cost advantages. The reported aqueous zinc-ion batteries usually use metal zinc as the negative electrode active material, an aqueous soluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/36H01M4/583H01M4/58
CPCH01M10/365H01M4/364H01M4/583H01M4/582Y02E60/10
Inventor 胡勇胜代涛陆雅翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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