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Non-aqueous electrolyte, preparation method thereof, and a lithium-ion battery

A non-aqueous electrolyte and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of high loss, affecting the electrochemical performance of the battery, and low Coulombic efficiency, so as to reduce interface resistance, improve low-temperature discharge performance, and increase ion migration rate Effect

Active Publication Date: 2016-06-15
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium-ion battery prepared by the functional electrolyte containing this substance will lose more Li during the first charge and discharge process. + , leading to low Coulombic efficiency, which affects the electrochemical performance of the battery

Method used

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  • Non-aqueous electrolyte, preparation method thereof, and a lithium-ion battery
  • Non-aqueous electrolyte, preparation method thereof, and a lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Non-aqueous electrolyte mainly includes organic solvent, conductive lithium salt and additives. The organic solvent is composed of cyclic carbonate solvent (ethylene carbonate EC) and linear carbonate solvent (ethyl methyl carbonate EMC). EC and wire The weight ratio of type carbonate is EC:EMC=1:2. The conductive lithium salt LiPF 6 The concentration in the organic solvent is 1.0mol / L, and the commonly used additives are vinylene carbonate in an amount of 1.0wt.% and propane sultone in an amount of 1.0wt.%, and the additives are 2,2,4 , 4-tetrafluoro-1,3-dithietane, the dosage is 0.1wt.%.

[0027] The preparation method of electrolyte is:

[0028] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0029] (2) Dissolving the conductive lithium salt in the above-mentioned organic solvent at room temperature, and stirring evenly;

[0030] (3) Add commonly used addi...

Embodiment 2

[0034] The preparation method of the non-aqueous electrolyte solution of this embodiment is the same as that of Example 1, except that 0.5wt.% of 2,2,4,4-tetrafluoro-1,3-dithietane is used , the non-aqueous electrolyte thus prepared was applied to a full battery to test its performance in the same manner as in Example 1.

Embodiment 3

[0036] The preparation method of the non-aqueous electrolyte solution of this embodiment is the same as that of Example 1, except that 1.0 wt.% of 2,2,4,4-tetrafluoro-1,3-dithietane is used , the non-aqueous electrolyte thus prepared was applied to a full battery to test its performance in the same manner as in Example 1.

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Abstract

The invention discloses non-aqueous electrolyte, a preparation method of the non-aqueous electrolyte as well as a lithium ion battery. The non-aqueous electrolyte mainly comprises the following raw materials: an organic solvent, conducting lithium salt and an additive, wherein the organic solvent consists of cyclic carbonate and a linear cyclic carbonate solvent; the concentration of conducting lithium salt in the organic solvent is 0.8-1.5mol / L; the additive is 0.01-10wt% of at least one of the following compounds shown in a formula (I) shown in the specification. After the compounds are added into the non-aqueous electrolyte, the cyclic service life of the lithium ion battery can be prolonged; the high-voltage and high-low-temperature performances are improved; the air swelling problem of a battery can be inhibited.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion batteries, in particular to a nonaqueous electrolytic solution, a preparation method thereof and a lithium ion battery. Background technique [0002] Due to its excellent characteristics (high working voltage, high specific capacity, long cycle life, environmental friendliness, and no memory effect), lithium-ion batteries have become the fastest-growing and most valued new high-energy batteries. Structurally, lithium-ion batteries are mainly composed of positive and negative electrode materials, and non-aqueous electrolytes containing lithium salts. [0003] Since the development of organic electrolytes for lithium-ion batteries, the most widely used is the conductive lithium salt LiPF 6 Dissolved in organic carbonate solvents, such as: ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), etc. solvent. The n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/058Y02E60/10
Inventor 仰永军李斌陈卫万华平
Owner GUANGZHOU TINCI MATERIALS TECH
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