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Electrolyte for aqueous zinc ion secondary battery and preparation method and application of electrolyte

A secondary battery and electrolyte technology, applied in secondary battery, electrolyte storage battery manufacturing, non-aqueous electrolyte storage battery, etc., can solve the problems of poor cycle stability of electrolyte decomposition battery, high charging potential, etc., to overcome battery cycle stability Poor, slow decomposition, low cost effect

Active Publication Date: 2018-08-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional Prussian blue zinc-ion batteries generally have problems such as electrolyte decomposition caused by excessive charging potential and poor battery cycle stability, which need to be further improved.

Method used

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  • Electrolyte for aqueous zinc ion secondary battery and preparation method and application of electrolyte
  • Electrolyte for aqueous zinc ion secondary battery and preparation method and application of electrolyte
  • Electrolyte for aqueous zinc ion secondary battery and preparation method and application of electrolyte

Examples

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Embodiment 1

[0030] An electrolyte for an aqueous zinc ion secondary battery in this embodiment, the electrolyte is composed of soluble zinc salt, nickel salt, pH buffer and deionized water, and the zinc salt is zinc sulfate (ZnSO 4 ), the nickel salt is nickel sulfate (NiSO 4 ), pH buffering agent is citric acid, wherein, the concentration of described zinc sulfate is 2mol / L, the concentration of nickel sulfate is 0.3mmol / L, the concentration of citric acid is 0.1mol / L, above-mentioned electrolyte solution uses nitrogen before 10 mol / L minute.

[0031] An electrolyte for an aqueous zinc ion secondary battery of the present embodiment is prepared by the following method, which specifically includes the following steps:

[0032] (1) 20ml of 2mol / L zinc sulfate is dissolved in deionized water, and stirred to dissolve completely to obtain an aqueous solution of zinc sulfate;

[0033] (2) adding 0.4g of citric acid as a weakly acidic pH buffer to the zinc sulfate aqueous solution, and stirri...

Embodiment 2

[0043] A kind of electrolytic solution that is used for water system zinc ion secondary battery of the present embodiment, described electrolytic solution is made up of soluble zinc salt, nickel salt, pH buffering agent and deionized water, and described zinc salt is zinc sulfate (ZnSO 4 ), the nickel salt is nickel sulfate (NiSO 4 ), the pH buffering agent is citric acid, wherein, the concentration of zinc sulfate is 2mol / L, the concentration of nickel sulfate is 0.6mmol / L, the concentration of citric acid is 20g / L, and the above-mentioned electrolytic solution is led to nitrogen for 10 minutes before use .

[0044] An electrolyte solution for an aqueous zinc-ion secondary battery in this embodiment is prepared by the following method, specifically including the following steps:

[0045] (1) 20ml 2mol / L zinc sulfate is dissolved in deionized water, stirred until fully dissolved, and an aqueous solution of zinc sulfate is obtained;

[0046] (2) Add 0.4g citric acid as weakly...

Embodiment 3

[0056] The difference between this embodiment and embodiment 1 is that the concentration of zinc salt in the electrolyte is 1 mol / L, and the concentration of other components is the same as that of embodiment 1. The positive and negative electrode materials of the battery in this example, the diaphragm, the battery assembly method, the test method and test conditions of the electrochemical performance are all the same as in Example 1. The battery of this embodiment does not need to be activated, and the specific capacity can reach 60mAh g -1 , due to the addition of nickel salt and pH buffering agent, the charge and discharge efficiency has been improved, up to 95%, and the electrochemical performance is better than that of the control example 1 without adding nickel salt and pH buffering agent, but there is still a small amount of electrolyte decomposition , so the cycle stability is slightly worse than that of Example 1, and the subsequent use of zinc sulfate as the zinc sal...

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Abstract

The invention relates to an electrolyte for an aqueous zinc ion secondary battery and preparation method and application of electrolyte, and belongs to the technical field of batteries. The electrolyte comprises a soluble zinc salt, a nickel salt, a pH buffer agent and deionized water, wherein the concentration of the zinc salt is (1-3)mol / L, the concentration of the nickel salt is 0.1-0.4 thousandth of the concentration of the zinc salt, the concentration of the pH buffer agent is 0.1mol / L, and a negative ion contained in the nickel salt and a negative ion contained in the zinc salt are samein constituent. By simultaneously introducing the buffer agent and nickel ions into the electrolyte, the decomposition of the electrolyte in the charge-discharge process can be remarkably reduced, thecoulombic efficiency and the cycle stability of a Prussian blue zinc ion battery are improved, and the problems of electrolyte decomposition and relatively poor battery cycle stability of a Prussianblue positive electrode aqueous zinc ion battery system in the prior art are solved. Moreover, the electrolyte is simple in formula and low in cost, is green and environmental-friendly and is suitablefor the field of energy storage on a large scale.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrolyte for an aqueous zinc ion secondary battery and a preparation method and application thereof. Background technique [0002] With the depletion of fossil fuels such as petroleum, people pay more and more attention to the development of renewable and clean energy such as solar energy, wind energy, and water energy. However, these clean energy sources are intermittently unstable, and if they are directly integrated into the grid, it will have a huge impact on the grid, which is not conducive to the use of these energy sources. Therefore, people need high-power and high-energy secondary batteries as large-scale energy storage tools to effectively store and distribute energy, play the role of peak-shaving and filling valleys, and make rational use of these natural resources. [0003] Today's more prominent energy storage medium is lithium ion battery. Lithi...

Claims

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Application Information

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IPC IPC(8): H01M10/0563H01M10/058
CPCH01M10/0563H01M10/058Y02E60/10Y02P70/50
Inventor 韩建涛徐月
Owner HUAZHONG UNIV OF SCI & TECH
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