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Electrolyte for reducing self-discharge of lithium ion battery and application

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of reducing battery self-discharge, complex process, reducing battery capacity, etc., to achieve the effect of reducing self-discharge

Active Publication Date: 2019-04-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as Al 2 o 3 , MgO, etc. have been widely used in the coating of electrode materials, but the process is complicated, the cost is high, and the capacity of the battery will be reduced
Compared with surface coating, improving the stability of the electrolyte by improving the composition of the electrolyte is a more effective method to reduce the self-discharge of the battery, but there are currently few studies on improving the self-discharge behavior of lithium-ion batteries , is worthy of further study

Method used

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  • Electrolyte for reducing self-discharge of lithium ion battery and application
  • Electrolyte for reducing self-discharge of lithium ion battery and application
  • Electrolyte for reducing self-discharge of lithium ion battery and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Electrolyte solution composition: the additive is LiBOB, the concentration is 0.03mol / L; the solvent is a mixture of propylene carbonate and diethyl carbonate (volume ratio 1:1), the lithium salt is LiPF6, the concentration is 1mol / L;

[0019] According to Li 3 V 2 (PO 4 ) 3 The mass ratio of conductive carbon black and binder is 8:1:1, dissolved in an appropriate amount of N-methylpyrrolidone and mixed evenly, coated with a wet film preparer to form an electrode film with a thickness of 0.15mm, and dried in vacuum Finally, slice the electrode sheets with a diameter of 12mm with a microtome, weigh and calculate the mass of the active material. At the same time, a lithium sheet was used as the negative electrode, Celgard 2500 was used as the diaphragm, 50 microliters of electrolyte was added, and a button battery was assembled in a glove box filled with argon, and then the assembled battery was subjected to an electrochemical test. Let it stand for 5 hours first, the...

Embodiment 2

[0021] Electrolyte solution composition: the additive is LiBOB, the concentration is 0.005mol / L; the solvent is a mixture of propylene carbonate and diethyl carbonate (volume ratio 1:1), the lithium salt is LiPF6, the concentration is 1mol / L;

[0022] Test results such as figure 1 As shown, the self-discharge rate of the battery after shelving is 9%.

Embodiment 3

[0024] Electrolyte solution composition: the additive is LiBOB, the concentration is 0.05mol / L; the solvent is a mixture of propylene carbonate and diethyl carbonate (volume ratio 1:1), the lithium salt is LiPF6, the concentration is 1mol / L;

[0025] Test results such as figure 1 As shown, the self-discharge rate of the battery after shelving is 2%.

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Abstract

The invention discloses an electrolyte for reducing self-discharge of a lithium ion battery. The electrolyte is used as a lithium ion battery using Li3V2(PO4)3 as a cathode material. The electrolyte composition includes: the additive being LiBOB, the solvent being mixed by propylene carbonate and diethyl carbonate mixed (volume ratio is 1:1), the lithium salt being LiPF6, and the concentration being 1 mol / L. the electrolyte effectively reduces self-discharge of Li3V2(PO4)3 lithium-ion battery and significantly improves the energy storage performance.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to electrolytes for lithium-ion batteries. Background technique [0002] In the continuous development of human beings, energy is crucial. However, with the progress of society, energy problems are becoming more and more serious, and non-renewable energy is excessively consumed, so energy storage becomes particularly important. Lithium-ion batteries have been widely used in various fields due to their high energy density and other advantages, such as electronic equipment and hybrid electric vehicles. However, most lithium-ion batteries have varying degrees of self-discharge problems after being fully charged for a period of time, resulting in poor energy storage performance of the battery, which has a lot to do with the electrolyte. [0003] As a medium for conducting ions and electrons, the electrolyte plays an important role in the performance of the battery. At present, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567
CPCH01M10/0566H01M10/0567H01M10/0569Y02E60/10
Inventor 马荻张华民冯凯李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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