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Application of carbon materials and mixtures of ionic bromides and aqueous zinc-bromine dual-ion batteries

A dual ion and carbon material technology, applied in the field of electrochemistry, can solve the problems of hindering the normal deposition and dissolution of zinc, poor cycle performance, and reduced Coulombic efficiency, etc., to achieve long cycle life and operation stability, good operation stability, The effect of good cycle stability

Active Publication Date: 2022-05-24
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 carbon materials and mixtures of ionic bromides and aqueous zinc-bromine dual-ion batteries
  • Application of carbon materials and mixtures of ionic bromides and aqueous zinc-bromine dual-ion batteries
  • Application of carbon materials and mixtures of ionic bromides and aqueous zinc-bromine dual-ion batteries

Examples

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Embodiment 1

[0041] This embodiment provides a kind of Zn|saturated ZnCl 2 Aqueous solution | ZnBr 2 -Natural graphite battery. The negative electrode active material of the battery was a metal Zn foil with a thickness of 0.1 mm. Electrolyte configuration at 25°C: add 432g ZnCl to 100g pure water 2 Obtain saturated ZnCl 2 After the aqueous solution, an additional 21.5 g of ZnCl was added 2 , to obtain supersaturated ZnCl 2 aqueous solution. The positive electrode is ZnBr 2 , Natural graphite powder (particle size less than 10um) and PTFE adhesive are uniformly mixed according to the mass ratio of 1.27:1:0.1 (the molar ratio of bromine atoms and carbon atoms in graphite is 0.95:7) made of thin film electrodes. When the battery is assembled, the film positive electrode, glass fiber separator (trade name: Whatman) and metal Zn foil are formed into a sandwich structure in order in the air, and the electrolyte (4g / Ah) is dripped into the glass fiber separator to make it completely infilt...

Embodiment 2

[0044] This embodiment provides a kind of Zn|ZnCl 2 Saturated Aqueous Solution | NaBr-Natural Graphite Batteries. The negative electrode active material 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 that of Example 1. The positive electrode is a thin film made of NaBr, natural graphite powder (particle size less than 10um) and PVDF binder in a mass ratio of 1.16:1:0.1 (the molar ratio of bromine atoms and carbon atoms in graphite is 0.95:7). electrode. When the battery is assembled, the film positive electrode, the glass fiber separator (trade name: Whatman) and the galvanized copper foil are formed into a sandwich structure in order in the air, and the electrolyte (7.1g / Ah) is added dropwise to the glass fiber separator to make it. The positive and negative electrodes were completely infiltrated, after which the cells were seale...

Embodiment 3

[0047] This embodiment provides a kind of Zn|saturated ZnCl 2 Aqueous solution | MgBr 2 -Natural graphite battery. The negative electrode active material 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 that of Example 1. The positive electrode is MgBr 2 , Natural graphite powder (particle size less than 10um) and PVDF binder in a mass ratio of 1.04:1:0.1 (the molar ratio of bromine atoms and carbon atoms in graphite is 0.95:7), which is made of thin film electrodes. When the battery is assembled, the film positive electrode, the glass fiber separator (trade name: Whatman) and the galvanized copper foil are formed into a sandwich structure in order in the air, and the electrolyte (7.1g / Ah) is added dropwise to the glass fiber separator to make it. The positive and negative electrodes were completely infiltrated, after which the cel...

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Abstract

The invention provides an application of a mixture of a carbon material and an ionic bromide in a battery cathode active material of an aqueous electrolyte. The present invention also provides a water-based zinc-bromine double ion battery, comprising a positive electrode active material, a negative electrode active material, and an electrolyte; wherein, the positive electrode active material comprises a mixture of carbon material and ionic bromide; the electrolyte contains saturated ZnCl 2 aqueous solution. The battery of the invention has long cycle life and operation stability. Due to the saturated ZnCl used in the present invention 2 The deposition and dissolution process of the metal Zn negative electrode active material in the hydrate is very efficient and reversible, and there is no risk of dendrite growth, so that the negative electrode side has good operational stability. The battery of the invention has high safety and is environmentally friendly. The battery of the invention has low cost and high energy density.

Description

technical field [0001] The invention belongs to the field of electrochemistry. In particular, the present invention relates to the use of mixtures of carbon materials and ionic bromides and aqueous zinc-bromine dual-ion batteries. Background technique [0002] With the rapid development of my country's economy, the efficient use of existing energy output and the development of new renewable energy have become an important part of the energy structure upgrade. The importance of large-scale power 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 solution containing zinc salts a...

Claims

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Application Information

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Patent Type & Authority Patents(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