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Lithium battery electrolyte, application of lithium battery electrolyte and lithium oxygen battery containing electrolyte

A lithium-oxygen battery and electrolyte technology, applied in the field of electrochemical materials, can solve the problems of limited use effect of solid catalysts, difficult to achieve commercialization, and high charge and discharge potential, and achieve improved electrochemical performance, reduction of overpotential during charging, and rate of charge. The effect of performance optimization

Pending Publication Date: 2022-02-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of the above-mentioned existing lithium-oxygen batteries such as high charge-discharge potential, poor cycle performance, and low energy efficiency, as well as the problems of limited actual use effect, high cost, and difficulty in commercialization of the existing solid catalyst, the present invention Provided is a lithium battery electrolyte that can effectively improve the electrochemical performance of a lithium-oxygen battery and its application method, and further provides a lithium-oxygen battery containing the electrolyte

Method used

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  • Lithium battery electrolyte, application of lithium battery electrolyte and lithium oxygen battery containing electrolyte
  • Lithium battery electrolyte, application of lithium battery electrolyte and lithium oxygen battery containing electrolyte
  • Lithium battery electrolyte, application of lithium battery electrolyte and lithium oxygen battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A lithium oxygen battery:

[0060] Positive electrode: acetylene black positive electrode;

[0061] Negative electrode: metal lithium negative electrode;

[0062] The composition of the electrolyte is: the solvent is tetraethylene glycol dimethyl ether, the lithium salt is 1 mol / L lithium bistrifluoromethanesulfonylimide, the additive is thioacetamide, and the concentration of thioacetamide is shown in the table below.

[0063] Contrast table of thioacetamide concentration used in each test group of embodiment 1.

[0064]

specific Embodiment 2

[0076] The additives used in each test group of specific embodiment 2 are shown in the following table.

[0077]

[0078] The lithium-oxygen batteries of each of the above test groups were tested the same as in Example 1, and compared with the S105 test group. Specific as Figure 4 shown.

[0079] from Figure 4 It can be clearly seen that the use of other similar additive components, although compared with the D101 blank control group, has a certain improvement effect, but compared with the thioacetamide used in the present invention, they are far inferior. For example, the D204 test group is the closest to this application in terms of charging curve trend, but it only has the first 100-150 mAh·g -1 platform, but there is no second 200-300 mAh·g -1 platform, so the subsequent potential rise is too large. The rest of the test groups also have similar situations, most of which have 100-200 mAh·g -1 platform, but there is no second 200-300 mAh·g -1 platform. It shows ...

Embodiment 2

[0084] A lithium-oxygen battery, the negative electrode and electrolyte of which are the same as those of the S105 test group in Example 1, the difference being that the positive electrode uses a graphite electrode, and the battery test group obtained is marked as S200.

[0085] The same test as S104 was carried out on S200, and compared with the S104 test group.

[0086] The comparison results are as Figure 11 shown.

[0087] from Figure 11 It can be clearly seen that after replacing the acetylene black electrode with graphite, although it still maintains a good anti-polarization ability, the 200-300 mAh·g -1 The trend of the platform weakens or even basically disappears, indicating that acetylene black has a certain promotion effect on the generation of the platform of the second charging curve, or there is a synergistic effect. The researchers believe that the generation of the second platform requires the positive electrode material to be more effectively infiltrated ...

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Abstract

The invention belongs to the field of electrochemical materials, and particularly relates to a lithium battery electrolyte, application of the lithium battery electrolyte and a lithium oxygen battery containing the electrolyte. The electrolyte provided by the invention contains thioacetamide; the molecular formula of the thioacetamide is CH3CSNH2, the thioacetamide is used for a lithium-oxygen battery, and the content of thioacetamide is 1-10 wt%. Through improvement of the electrolyte, the electrochemical performance of the lithium-oxygen battery can be effectively improved, and the rate capability and the cycle performance can be remarkably optimized; the polarization of the lithium-oxygen battery is obviously inhibited, and the overpotential is obviously reduced in the charging process; the actual commercialization cost is low, the difficulty is small, and the method is suitable for popularization and large-scale production.

Description

technical field [0001] The invention belongs to the field of electrochemical materials, and in particular relates to a lithium battery electrolyte, the application of the lithium battery electrolyte, and a lithium oxygen battery containing the electrolyte. Background technique [0002] As people's demand for energy storage devices with higher specific energy continues to grow, the requirements for lithium batteries are also getting higher and higher. Lithium-oxygen battery is a new type of battery that uses lithium as the negative electrode and oxygen as the positive electrode reactant through the contact between lithium and oxygen. The non-aqueous lithium-oxygen battery has a high theoretical specific energy (about 11430Wh·kg -1 ), which is 5 to 10 times that of traditional lithium-ion batteries, so it has received widespread attention. However, lithium-oxygen batteries are still in the basic research stage, and there are mainly problems such as high charge-discharge over...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052H01M4/133
CPCH01M10/0567H01M10/052H01M4/133H01M2300/0017Y02E60/10
Inventor 唐谊平陈茂林陈强张健力侯广亚
Owner ZHEJIANG UNIV OF TECH
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