Non-water electrolyte for lithium ion battery as well as preparation and application thereof

A lithium-ion battery and non-aqueous electrolyte technology, which is applied in the field of non-aqueous electrolyte and its preparation, can solve the problems of low cycle life, large irreversible capacity loss of the battery for the first charge and discharge, etc., to inhibit decomposition, improve capacity storage characteristics, Effect of improving thermal stability

Inactive Publication Date: 2010-05-05
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The batteries prepared by using the existing electrolyte still have the disadvantages of large irreversible capacity loss and low cycle life after the first charge and discharge.

Method used

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  • Non-water electrolyte for lithium ion battery as well as preparation and application thereof
  • Non-water electrolyte for lithium ion battery as well as preparation and application thereof
  • Non-water electrolyte for lithium ion battery as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Mix ethylene carbonate (EC), dimethyl carbonate (DMC) and diethyl carbonate (DEC) with a mass ratio of EC:DMC:DEC=1:1:1, and use Molecular sieve, calcium hydride and sodium hydride are used for impurity removal and water removal, and then vacuum filtration in a glove box filled with high-purity argon to obtain a non-aqueous solvent;

[0034] (2) At room temperature, the LiPF 6 Add to the non-aqueous solvent in batches, add the process control temperature below 40 ℃, LiPF 6 The concentration of 1mol / L, and stir evenly to obtain ordinary electrolyte;

[0035] (3) In the common electrolyte, add dimethyl vinylene carbonate in an amount of 2% by mass of the common electrolyte to obtain a non-aqueous electrolyte for lithium ion batteries.

Embodiment 2

[0037] (1) Mix ethylene carbonate (EC), dimethyl carbonate (DMC) and diethyl carbonate (DEC) with a mass ratio of EC:DMC:DEC=1:1:1, and use Molecular sieve, calcium hydride, sodium hydride are purified to remove impurities and water, and then filtered under reduced pressure in a glove box filled with high-purity argon to obtain a non-aqueous solvent;

[0038] (2) At room temperature, the LiPF 6 Dissolved in the above non-aqueous solvent, LiPF 6 The concentration of 1mol / L, and stir evenly to obtain ordinary electrolyte;

[0039] (3) In the common electrolyte, furanone is added in an amount of 2% by mass of the common electrolyte to obtain a non-aqueous electrolyte for lithium ion batteries.

Embodiment 3

[0041] (1) Mix ethylene carbonate (EC), dimethyl carbonate (DMC) and diethyl carbonate (DEC) with a mass ratio of EC:DMC:DEC=1:1:1, and use Molecular sieve, calcium hydride, sodium hydride are purified to remove impurities and water, and then filtered under reduced pressure in a glove box filled with high-purity argon to obtain a non-aqueous solvent;

[0042] (2) At room temperature, the LiPF 6 Add to the non-aqueous solvent in batches, add the process control temperature below 40 ℃, LiPF 6 The concentration of 1mol / L, and stir evenly to obtain ordinary electrolyte;

[0043] (3) In the common electrolyte, α-angelica lactone is added in an amount of 2% by mass of the common electrolyte to obtain a non-aqueous electrolyte for lithium ion batteries.

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Abstract

The invention discloses a non-water electrolyte for a lithium ion battery as well as a preparation method and application thereof. In the invention, cyclic carbonate ester and chain carbonate ester are mixed; and then lithium salts and film forming additive are added in sequence to obtain the non-water electrolyte for the lithium ion battery. The non-water electrolyte is prepared by adding dimethyl vinylene carbonate, furanone or Alpha-angelica lactone in the traditional non-water electrolyte for the lithium ion battery, wherein the dimethyl vinylene carbonate, the furanone and the Alpha-angelica lactone can restrict the decomposition of the electrolyte and participate in the formation of a positive SEI film and a negative SEI film, therefore, the decomposition of the electrolyte under the high temperature can be effectively restricted, the initial discharge capacity and the circulation property of the lithium ion battery can be enhanced, and the capacity storage characteristic of the battery under the high temperature can be improved. Besides, the introduction of the dimethyl vinylene carbonate, the furanone or the Alpha-angelica lactone can also improve the thermal stability of the electrolyte. The prepared non-water electrolyte for the lithium ion battery has low cost and better application prospect.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery electrolyte systems, and particularly relates to a non-aqueous electrolyte for lithium ion batteries and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become the current research hotspot in the field of new energy due to their advantages of high working voltage, high energy density, and long cycle life. With the continuous development of the commercialization of lithium ion batteries, improving the cycle stability, high and low temperature discharge performance and safety performance of lithium ion batteries has attracted people's attention. [0003] Lithium-ion batteries are mainly composed of three parts: positive electrode, negative electrode and electrolyte. In commercial lithium-ion batteries, the positive and negative electrodes mainly use lithium cobalt oxide and graphite as lithium intercalation materials, and the electrolyte m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 许梦清邢丽丹李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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