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Lithium ion secondary battery electrolyte and preparation method thereof

A secondary battery and electrolyte technology, which is applied in secondary battery, electrolyte storage battery manufacturing, organic electrolyte, etc., can solve the problems of poor high-temperature storage performance and low-temperature discharge performance of batteries, and achieve low-temperature discharge performance and rate discharge performance. Improved rate discharge performance and improved cycle performance

Active Publication Date: 2014-12-17
YICHUN JINHUI NEW ENERGY MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the additive makes the battery's high-temperature storage performance and low-temperature discharge performance poor.

Method used

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

Examples

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specific Embodiment approach

[0027] Specific embodiments: the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the general description and the following specific embodiments of the present invention are exemplary and illustrative, and are used to provide further explanations for the invention to be protected .

[0028] For realizing above-mentioned purpose of the present invention, the present invention adopts the raw material of following weight percent to prepare lithium-ion secondary battery electrolyte:

[0029] The combination of organic solvents accounting for 70-90% of the battery electrolyte, 8-20% of lithium salts and combinations as electrolytic salts, and 0-10% of conventional additives and combinations, that is to say, the above-mentioned proportions can be added to the battery electrolyte of the present invention conventional additives or no conventional additives, and then add the additive prepared by the prese...

Embodiment 1

[0044] Electrolyte was prepared in the same way as in Comparative Example 2, except that it was added on this basis. In this solution, add each 0.5% distyryl bisbenzoxazole according to the total mass of the electrolyte 1,4-bis(benzoxazolyl-2-yl)naphthalene (1-o-cyano-styryl, 4-p-cyano-styryl)benzene 2.5-bis-bis(benzoxazole-2-)thiophene The electrolyte solution of the present invention is obtained.

Embodiment 2

[0046] Electrolyte was prepared in the same way as in Comparative Example 2, except that it was added on this basis. In this solution, add each 0.5% distyryl bisbenzoxazole according to the total mass of the electrolyte 1,4-bis(benzoxazolyl-2-yl)naphthalene (1-o-cyano-styryl, 4-p-cyano-styryl)benzene The electrolyte solution of the present invention is obtained.

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Abstract

The invention provides lithium ion secondary battery electrolyte and a preparation method thereof. The lithium ion secondary battery electrolyte comprises (1) 70-90wt% of a carbonate type organic solvent, (2) 8-20wt% of lithium salt and (3) 0.01-10.0wt% of an additive, wherein the additive is an organic compound comprising a group with the following structure described in the specification. The lithium ion secondary battery electrolyte comprises the carbonate solvent used by a lithium ion battery, the lithium salt taken as electrolysis salt, and the additive used for preventing the damage to a solid electrolyte interface (SEI) diaphragm layer so as to prevent the decomposition of the electrolyte caused by gas produced by the damage, so that the battery is prevented from being expanded since the gas is generated in the battery in the use process, and the cycle performance of the lithium ion battery is improved.

Description

Technical field: [0001] The invention relates to a lithium ion battery electrolyte and a preparation method thereof, in particular to a lithium ion secondary battery electrolyte and a preparation method thereof. Background technique: [0002] Lithium-ion battery electrolyte is one of the key materials in lithium-ion batteries, and its performance will affect the performance of the entire lithium-ion battery. Therefore, to solve the problems in the use of lithium-ion batteries or to improve the performance of lithium-ion batteries, researchers will not only pay attention to the performance and characteristics of the positive and negative materials of lithium-ion batteries, but also strive to improve the electrolyte ratio of lithium-ion batteries used and preparation methods. [0003] Normally, lithium-ion battery electrolyte mainly consists of three parts: lithium salt LiPF6, organic solvent, and additives. Lithium salt LiPF6 has been widely used commercially, and the selec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058
CPCH01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 陈世彬薛利
Owner YICHUN JINHUI NEW ENERGY MATERIALS
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