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Lithium ion battery electrolyte and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion battery electrolyte and its preparation, can solve the problems of lithium-ion battery cycle performance degradation, inability to form stable, graphite layer peeling, etc., to broaden temperature adaptability and improve stability performance and increase capacity

Inactive Publication Date: 2016-02-24
百顺松涛(天津)动力电池科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the solvents contained in the currently widely used commercial lithium-ion battery electrolytes cannot form a stable solid electrolyte phase interface (SEI) film. The surface of the graphitized carbon electrode material decomposes, causing the graphite layer to peel off, resulting in a decrease in the cycle performance of the lithium-ion battery and poor rate performance

Method used

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  • Lithium ion battery electrolyte and preparation method thereof
  • Lithium ion battery electrolyte and preparation method thereof
  • Lithium ion battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A lithium-ion battery electrolyte, based on the total mass of organic solvents and additives as 100%, wherein the components and their mass percentages are as follows: ethylene carbonate is 23%, ethyl methyl carbonate is 57%, butene sulfite The ester is 20%, and the concentration of lithium difluorooxalate borate (LiODFB) in the electrolyte is 1mol / L; under the protection of argon, mix the components in proportion in a glove box to prepare the electrolyte.

[0049] Assemble 10 sets of button batteries, and conduct charge and discharge tests on 10 sets of button batteries at room temperature through the blue electric battery test system at a current density of 0.1C. After 10 weeks of testing, the average capacity of the button cell is 360mAh / g.

[0050] Another 10 sets of button batteries were assembled, and the charge and discharge tests of 10 sets of button batteries were carried out at a current density of 0.1C through the blue electric battery test system under low tem...

Embodiment 2

[0052] A lithium-ion battery electrolyte, based on the total mass of organic solvents and additives as 100%, wherein the components and their mass percentages are as follows: ethylene carbonate is 20%, ethyl methyl carbonate is 50%, butene sulfite The ester is 30%, and the concentration of lithium difluorooxalate borate (LiODFB) in the electrolyte is 1mol / L; under the protection of argon, mix the components in proportion in a glove box to prepare the electrolyte.

[0053] Assemble 10 sets of button batteries, and conduct charge and discharge tests on 10 sets of button batteries at room temperature through the blue electric battery test system at a current density of 0.1C. After 10 weeks of testing, the button battery has an average capacity of 354mAh / g.

[0054] Another 10 sets of button batteries were assembled, and the charge and discharge tests of 10 sets of button batteries were carried out at a current density of 0.1C through the blue electric battery test system under lo...

Embodiment 3

[0056] A lithium-ion battery electrolyte, based on the total mass of organic solvents and additives as 100%, wherein the components and their mass percentages are as follows: ethylene carbonate is 30%, dimethyl carbonate is 69.5%, propylene sulfite The concentration of lithium diacetate borate (LiBOB) in the electrolyte is 0.5%, and the concentration of the substance in the electrolyte is 0.6mol / L; under the protection of argon, the components are mixed in proportion in the glove box to prepare the electrolyte.

[0057] Assemble 10 sets of button batteries, and conduct charge and discharge tests on 10 sets of button batteries at room temperature through the blue electric battery test system at a current density of 0.1C. After 10 weeks of testing, the button battery has an average capacity of 243mAh / g.

[0058] Another 10 sets of button batteries were assembled, and the charge and discharge tests of 10 sets of button batteries were carried out at a current density of 0.1C throu...

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Abstract

The invention provides a lithium ion battery electrolyte and belongs to the technical field of lithium secondary batteries. The lithium ion battery electrolyte is composed of organic solvents, additives and lithium salt. The organic solvents are composed of a solvent A and a solvent B. According to the principle that the total mass of the organic solvents and the additives is 100%, the lithium ion battery electrolyte is prepared from, by mass, 20-30% of the solvent A, 30-69.5% of the solvent B and 0.5-50% of the additives. The solvent A is ethylene carbonate. The solvent B is one or more of methyl ethyl carbonate, dimethyl carbonate and diethyl carbonate, The additives are sulfite organic solvents. The concentration of the mass of lithium salt in the electrolyte is 0.6-1.5 mol / L. The invention further provides a preparation method of the lithium ion battery electrolyte and a lithium secondary battery. The compatible characteristic between the lithium ion battery electrolyte and electrode materials is good, the temperature adaption characteristic of the electrolyte materials is widened, and by means of the lithium ion battery electrolyte, the circulation performance, the rate performance and the temperature adaptability of the lithium secondary battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to a lithium ion battery electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of chemical power supply. Because of its high energy density, high working voltage, long life and no environmental pollution, it is widely used in digital electronics, mobile power supplies, electric portable tools, electric vehicle power supplies, etc. middle. [0003] Lithium-ion battery electrolyte is an important part of lithium-ion batteries. In lithium-ion batteries, it plays the role of transmitting charge between the positive and negative electrodes. It affects the capacity, working temperature, cycle efficiency and safety performance of lithium-ion batteries. very important. Lithium-ion battery electrolyte is generally composed of high-purity organic solvent, electrolyte lithium salt and necessary additives. The solven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2220/20H01M2220/30H01M2300/0037Y02E60/10
Inventor 朱亭陶红霞
Owner 百顺松涛(天津)动力电池科技发展有限公司
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