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Lithium-ion battery electrolyte and lithium ion battery with the same

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of lithium-ion battery cycle capacity attenuation, aggravated transition metal element dissolution, and oxidative decomposition, etc., to improve cycle stability. , The effect of improving interface properties and reducing interface impedance

Inactive Publication Date: 2017-02-22
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high voltage, the conventional carbonate-based electrolyte will undergo severe oxidative decomposition in the battery, and the organic electrolyte will be oxidatively decomposed on the positive electrode at high temperature and under the catalysis of some transition metal elements. Further aggravate, even destroy the positive electrode material, intensify the dissolution of transition metal elements, resulting in a sharp decline in the cycle capacity of lithium-ion batteries

Method used

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  • Lithium-ion battery electrolyte and lithium ion battery with the same
  • Lithium-ion battery electrolyte and lithium ion battery with the same
  • Lithium-ion battery electrolyte and lithium ion battery with the same

Examples

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Effect test

Embodiment 1

[0031] An electrolyte solution for a lithium-ion battery mainly includes an organic solvent, a conductive lithium salt and additives, and the additives include common additives and phosphate ester additives. The organic solvent is composed of ethylene carbonate and ethyl methyl carbonate, and the weight ratio of ethylene carbonate to ethyl methyl carbonate is EC:EMC=1:2. The conductive lithium salt LiPF 6 The concentration in the organic solvent is 0.8 mol / L, and the commonly used additives are vinylene carbonate and fluoroethylene carbonate, and the dosages are 1.0% and 2.0% respectively. The phosphate ester additive is trimethyl phosphate, and the dosage is 3.0wt.%.

[0032] The compound method of present embodiment electrolyte is:

[0033] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0034] (2) Dissolving the conductive lithium salt in the above-mentioned organ...

Embodiment 2

[0038] The preparation method of the electrolyte of this embodiment is the same as that of Embodiment 1, except that the solvent is ethylene carbonate and ethyl methyl carbonate, and the weight ratio is 1:3. The conductive lithium salt LiPF 6 The concentration in organic solvent is 1.0mol / L. The commonly used additives are vinylene carbonate and 1,3-propane sultone, and the dosages are 1.0% and 1.0% respectively. The phosphate ester additive is trimethyl phosphate, and the dosage is 5.0wt.%. The electrolytic solution prepared in this way is applied to LiNi according to the method identical with embodiment 1 0.8 co 0.15 Al 0.05 o 2 / Graphite flexible packaging battery, tested LiNi 0.8 co 0.15 Al 0.05 o 2 The cycle performance of graphite soft packaging battery at 3.0-4.2V, 1C rate charge and discharge at room temperature.

Embodiment 3

[0040] The preparation method of the electrolyte of this embodiment is the same as that of Embodiment 1, except that the solvent is ethylene carbonate and diethyl carbonate, and the weight ratio is 1:2. The conductive lithium salt LiPF 6 The concentration in organic solvent is 1.0mol / L. The commonly used additives are vinylene carbonate and fluoroethylene carbonate, and the dosages are 1.0% and 3.0% respectively. The phosphate ester additive is tri-tert-butyl phosphate, and the dosage is 0.5wt.%. The electrolytic solution prepared in this way is applied to LiNi according to the method identical with embodiment 1 0.5 co 0.2 mn 0.3 o 2 / Graphite flexible packaging battery, tested LiNi 0.5 co 0.2 mn 0.3 o 2 / The cycle performance of graphite flexible packaging battery at room temperature at 3.0-4.35V, 1C rate charge and discharge.

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and discloses a lithium-ion battery electrolyte and a lithium ion battery with the same. The lithium-ion battery electrolyte is prepared from an organic solvent, conductive lithium salt and an additive; the additive is prepared from a common additive and a phosphoric acid ester additive, and the phosphoric acid ester additive has the structural formula shown in the formula (I) (please see the specification). According to the lithium-ion battery electrolyte, the phosphoric acid ester additive is added, the interface characteristics of the electrode / electrolyte of the lithium-ion battery can be improved, the stability is improved, interface impedance is reduced, the cycling stability, the high-temperature performance and the high-voltage performance of the lithium ion battery are improved accordingly, gas generation caused by organic solvent decomposition is inhibited, and expansion of the battery is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] Among the existing commercial secondary batteries, lithium-ion batteries have been widely used in military and civilian small electrical appliances, such as mobile phones, portable computers, cameras, even for electric and hybrid electric vehicles. However, in recent years, with the continuous updating of digital products and the vigorous development of electric vehicles, the requirements for the service life, high and low temperature performance, safety, and magnification of lithium-ion batteries have become higher and higher. Therefore, the research and development of lithium-ion battery materials is of great significance. [0003] The positive electrode active materials used in lithium-ion batteries mainly include lithium manganese oxide, lithium cob...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0566H01M10/0567H01M10/0569
CPCH01M10/056H01M10/0566H01M10/0567H01M10/0569Y02E60/10
Inventor 范伟贞余乐廖波谢添张利萍
Owner GUANGZHOU TINCI MATERIALS TECH
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