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Water system electrolyte and application thereof

A water-based electrolyte and electrolyte technology, applied in the field of electrochemical energy storage, can solve the problems of low decomposition voltage, restricting the development of water-system energy storage, hydrogen evolution, oxygen evolution reaction, etc., to increase the decomposition voltage, improve the capacity retention rate and use Life, the effect of inhibiting electrolysis

Active Publication Date: 2018-10-09
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the aqueous electrolyte, since the decomposition voltage of water is only 1.23V, when the voltage rises to a certain potential, hydrogen evolution and oxygen evolution reactions will occur
Constrained by the low decomposition voltage of water, when some water-based chemical power sources work at higher voltages, their lifespan decreases very quickly, and the capacity drops completely after only dozens or hundreds of charge-discharge cycles, which greatly limits Development of cheap, safe and environmentally friendly water energy storage

Method used

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  • Water system electrolyte and application thereof
  • Water system electrolyte and application thereof
  • Water system electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The concrete composition of the aqueous electrolyte of this example is water, potassium acetate, lithium acetate, and its preparation method is as follows:

[0026] Each component was weighed according to the weight ratio of water / potassium acetate / lithium acetate=1.5 / 7.5 / 1, and dissolved in water to obtain the aqueous electrolyte solution of this example. Wherein, potassium acetate accounts for 75% of the total mass fraction.

[0027] In addition, an aqueous electrolyte with a low concentration of potassium acetate was prepared as a comparison. Specifically, each component was weighed according to the weight ratio of water / potassium acetate / lithium acetate=8 / 1 / 1, and dissolved in water to obtain a potassium acetate concentration of 10% by mass aqueous electrolyte, as a comparison.

[0028] Three-electrode cyclic voltammetry was used to test the cyclic voltammetry curve of the aqueous electrolyte prepared in this example, wherein the working electrode and the counter e...

Embodiment 2

[0032] The concrete composition of the aqueous electrolyte of this example is water, potassium acetate, lithium acetate, and its preparation method is as follows:

[0033] Each component was weighed according to the weight ratio of water / potassium acetate / lithium acetate=1 / 7 / 1, and dissolved in water to obtain the aqueous electrolyte solution of this example. Among them, potassium acetate accounts for 77.8% of the total mass fraction.

[0034] Using the same method and conditions as in Example 1, the cyclic voltammetry curve test was carried out on the electrolyte of this example. The results showed that the oxygen evolution potential of the anode was 1.0V (vs. SCE), and the hydrogen evolution potential of the cathode was -1.2V (vs. SCE). The voltage window reaches 2.2V.

[0035] The aqueous electrolyte solution of this example is used in aqueous lithium-ion batteries, and the positive pole is commercially available spinel LiMn 2 o 4 , the negative electrode is LiTi 2 (PO ...

Embodiment 3

[0038] The concrete composition of the aqueous electrolyte of this example is water, potassium acetate, lithium sulfate, and its preparation method is as follows:

[0039] Each component was weighed according to the weight ratio of water / potassium acetate / lithium sulfate=1 / 6 / 1, and dissolved in water to obtain the aqueous electrolyte solution of this example. Wherein, potassium acetate accounts for 75% of the total mass fraction.

[0040] Using the same method and conditions as in Example 1, the cyclic voltammetry curve test was carried out on the electrolyte of this example. The results showed that the oxygen evolution potential of the anode was 1.0V (vs. SCE), and the hydrogen evolution potential of the cathode was -1.2V (vs. SCE). The voltage window reaches 2.2V.

[0041] The aqueous electrolyte of this example is used in an aqueous lithium-ion hybrid supercapacitor, and the positive electrode is a commercial spinel LiMn 2 o 4 The active material of the negative electrod...

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Abstract

The invention discloses a water system electrolyte and application thereof. The water system electrolyte comprises 40%-85% of potassium acetate by weight. The electrolyte is added with high concentration of potassium acetate, so that almost all water molecules can be hydrated with potassium ions, the water molecules are tightly connected with the potassium ions via a Van der Waals' force, hydrolysis of the water molecules in the surface of an electrode is inhibited, and thus, the decomposition voltage is improved, the service life of an electrochemical energy storage device is prolonged, the capacity maintaining rate and the electrochemical performance of the electrochemical energy storage device are improved, and the water system electrolyte and application thereof have great significancein research and application in the energy storage field of the water system.

Description

technical field [0001] The present application relates to the field of electrochemical energy storage, in particular to an aqueous electrolyte and its application. Background technique [0002] With the development of social economy, people's demand for energy is getting higher and higher. However, chemical energy is constantly being exhausted, and people are developing and utilizing renewable energy such as wind energy, water energy, and solar energy more and more widely. Therefore, energy storage technology and industry are highly valued by various countries, and research and development of various new electrochemical energy storage technologies are developing rapidly. At present, the main chemical power sources are secondary batteries, electrochemical supercapacitors and fuel cells. Electrochemical energy storage is divided into organic system and water system according to its electrolyte, that is, the electrolyte used is organic electrolyte and aqueous electrolyte. Du...

Claims

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Application Information

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IPC IPC(8): H01G11/62H01M10/36
CPCH01G11/62H01M10/36H01M2300/0005Y02E60/10
Inventor 邓文君李锐潘锋
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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