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Aqueous electrolyte and aqueous metal ion battery

A water-based electrolyte and electrolyte technology, applied in aqueous electrolytes, secondary batteries, circuits, etc., can solve the problems of capacity retention or low Coulombic efficiency, material dissolution, etc., and achieve stable electrode/electrolyte interface and high capacity retention , the effect of inhibiting the side reaction of oxygen evolution

Active Publication Date: 2019-07-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned electrolytes have achieved high voltage, there are generally problems of material dissolution, capacity retention or low Coulombic efficiency.

Method used

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  • Aqueous electrolyte and aqueous metal ion battery
  • Aqueous electrolyte and aqueous metal ion battery
  • Aqueous electrolyte and aqueous metal ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1.1 Preparation of aqueous electrolyte

[0048] 3.64g triethyl phosphate, 2.12g LiClO 4 (anhydrous) and 0.018gH 2 O mixed (stabilizer: water: metal salt molar ratio = 2:0.1:2), heated and stirred at 80°C, and allowed to cool to room temperature to obtain an aqueous electrolyte solution.

[0049] 1.2 Performance test

[0050] (1) Electrochemical window test

[0051] The glassy carbon electrode was used as the working electrode, the platinum wire was used as the counter electrode, and the silver-silver chloride was used as the reference electrode, and the test was carried out as a three-electrode system.

[0052] The above-mentioned three-electrode system was subjected to a cyclic voltammetry test on a Sultron (Salartron Analytical 1470E electrochemical test system in the UK), with a voltage range of -2.5V to 2.5V and a scan rate of 20mV / s.

[0053] For test results see figure 1 , figure 1 From the cyclic voltammetry curve obtained in Example 1 of the present invent...

Embodiment 2～3

[0059] 1.1 Preparation of aqueous electrolyte

[0060] Prepare the aqueous electrolyte according to the preparation process of Example 1, the difference is that triethyl hemiphosphate is replaced by equimolar acetone; that is, the stabilizer is a mixture of triethyl phosphate and acetone, and the mixture of triethyl phosphate and acetone Molar ratio is 1:1, is recorded as embodiment 2.

[0061] The aqueous electrolyte solution was prepared according to the preparation process of Example 1, except that triethyl phosphate was replaced by acetone, which was recorded as Example 3.

[0062] 1.2 Performance test

[0063] According to the test method of Example 1, the performance tests of Examples 2-3 were carried out respectively, and compared with Example 1, the results are shown in Table 1.

[0064] The performance test result of table 1 embodiment 2-6

[0065] Electrochemical window, V Charge and discharge voltage, V Capacity retention Coulombic efficiency ...

Embodiment 4～5

[0069] 1.1 Preparation of aqueous electrolyte

[0070] Prepare the aqueous electrolyte solution according to the preparation process of Example 1, the difference is that the amount of water is increased to make the molar ratio of stabilizer: water: metal salt = 2:1:2; record it as Example 4.

[0071] The aqueous electrolyte was prepared according to the preparation process of Example 1, except that the amount of stabilizer was reduced so that the molar ratio of stabilizer: water: metal salt = 1:0.1:2; recorded as Example 5.

[0072] 1.2 Performance test

[0073] According to the test method of Example 1, the performance tests of Examples 4-5 were carried out respectively, and compared with Example 1, the results are shown in Table 2.

[0074] The performance test result of table 2 embodiment 7-8

[0075] Electrochemical window, V Charge and discharge voltage, V Capacity retention Coulombic efficiency Example 1 3.0 2.5 94.6％ 99.2％ Example 4 2.5 ...

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Abstract

The invention provides an aqueous electrolyte and an aqueous metal ion battery. The aqueous electrolyte provided by the invention comprises a stabilizer, a metal salt and water, wherein the stabilizeris an oxygen-containing non-alcohol organic solvent of C3-C6; the oxygen-containing non-alcohol organic solvent of C3-C6 is selected from acetone and / or triethyl phosphate; and the metal salt is selected from one or more of lithium salt and sodium salt. The aqueous electrolyte is formed by matching the specific stabilizer with water and metal salt, so that high-potential water can be effectivelyinhibited from being oxidized into oxygen to cause an oxygen evolution side reaction, and low-potential water can be effectively inhibited from being oxidized into hydrogen to cause a hydrogen evolution side reaction, and the electrochemical stability window of the aqueous electrolyte is further improved; and the formed aqueous electrolyte has a stable electrode / electrolyte interface, high conductive effect, and relatively high capacity retention rate and coulombic efficiency.

Description

technical field [0001] The invention relates to the technical field of ion batteries, in particular to an aqueous electrolyte and an aqueous metal ion battery. Background technique [0002] With the continuous consumption of fossil energy and the increasing demand for energy for human development, it is imperative to develop renewable energy. It is imperative to develop renewable energy to transform intermittent energy such as solar energy, wind energy, and tidal energy into continuous energy supply. The key to the energy crisis and environmental pressure, so energy storage devices have become a research hotspot. Secondary batteries have attracted extensive attention due to their high energy density, long cycle life, and high voltage. However, traditional secondary batteries (nickel metal hydride batteries, lithium-ion batteries) use organic electrolytes, and the batteries have disadvantages such as flammability, toxicity, high production costs, and strict assembly conditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002Y02E60/10
Inventor 王秋实张军陈亮刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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