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Lithium ion battery electrolyte suitable for silicon carbon material and application of electrolyte

A lithium-ion battery, silicon carbon material technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor cycle performance, unstable electrode/electrolyte interface properties, etc. Contact, improve the effect of interface composition

Inactive Publication Date: 2018-07-17
广东卡达克汽车科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of unstable electrode / electrolyte interface properties and poor cycle performance of silicon-carbon negative electrode materials in the cycle process, thereby providing a lithium-ion battery electrolyte and its application adapted to silicon-carbon materials, Improving the cycle performance of the battery by improving the interface properties between the silicon carbon material and the electrolyte

Method used

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  • Lithium ion battery electrolyte suitable for silicon carbon material and application of electrolyte
  • Lithium ion battery electrolyte suitable for silicon carbon material and application of electrolyte
  • Lithium ion battery electrolyte suitable for silicon carbon material and application of electrolyte

Examples

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preparation example Construction

[0032] The preparation method of the lithium-ion battery electrolyte adapted to the silicon-carbon material comprises the following steps:

[0033] 1) mixing a cyclic carbonate solvent and a linear carbonate solvent, and purifying to obtain an organic solvent;

[0034] 2) Mix and stir the electrolyte lithium salt, functional additives, auxiliary additives, and the organic solvent obtained in step 1) at room temperature to obtain the above-mentioned lithium-ion battery electrolyte suitable for silicon-carbon materials.

[0035] Preferably, in step 1) of the electrolyte preparation method, the specific method of purification is to process the mixed solvent through molecular sieves; further preferably, the model of the molecular sieves is type, type or Type; Further preferably, the model of the molecular sieve is type or type.

[0036] Preferably, in step 2) of the electrolyte preparation method, the room temperature refers to a temperature of 25°C to 40°C.

[0037] A ...

Embodiment 1

[0051] Example 1 takes a button-type silicon carbon battery as an example, and the specific preparation method is as follows:

[0052] (1) The cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) are mass ratio EC:EMC:DMC=3:5:2 mix and use Type molecular sieve, calcium hydride, lithium hydride to purify and remove impurities and water to obtain non-aqueous organic solvent;

[0053] (2) At room temperature, add the electrolyte lithium salt lithium bistrifluoromethanesulfonimide (LiTFSi) to the solvent obtained in step (1), the final concentration is 1.0mol / L, stir well, and obtain a common electrolyte ;

[0054] (3) Add functional additive 5-methylthiophene-2-boronic acid to the ordinary electrolyte obtained in step (2), the mass percentage of the functional additive in the electrolyte is 1%, suitable for high energy density silicon carbon Lithium-ion electrolyte for negative electrode ma...

Embodiment 2

[0060] A lithium ion battery was prepared according to the method of Example 1, except that the mass percentage of the functional additive in the electrolyte was 0.5%.

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Abstract

The invention discloses a lithium ion battery electrolyte suitable for a silicon carbon material and application of the electrolyte. The lithium ion battery electrolyte comprises electrolyte lithium salt, an organic solvent and a functional additive. The structural formula of the functional additive is shown in the description. Meanwhile, the invention discloses a preparing method of the electrolyte, and further discloses a silicon carbon negative electrode lithium ion battery containing the lithium ion battery electrolyte suitable for the silicon carbon material. A dual-functional group containing thiophene and boric acid forms the additive of the electrolyte suitable for the silicon carbon material; since the additive has a high reduction potential, the additive can be reduced ahead of solvent compositions in the first time of charging and discharging, the interface composition of the silicon carbon material and the electrolyte is improved, and therefore an electrode / electrolyte interface is stabilized, the electrode surface reaction activity is restrained, an electrode is prevented from making contact with the electrolyte in the charging and discharging process, and the electrolyte composition decomposition is restrained. The silicon carbon negative electrode lithium iron battery containing the additive has better circulating performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a lithium-ion battery electrolyte suitable for silicon-carbon materials and an application thereof. Background technique [0002] From portable electronic devices, new energy vehicles, and large energy storage devices, lithium-ion batteries have been widely used in all aspects of people's lives. Lithium-ion batteries widely use transition metal lithium oxide as the positive electrode and graphite as the negative electrode material. However, the energy density of lithium-ion batteries in the existing system is increasingly difficult to meet people's needs. The contradictions such as charging smartphones once a day and anxiety about the mileage of electric vehicles are very serious. Energy density restricts the development of lithium batteries. In order to better meet people's needs, using raw materials with higher specific capacity is undoubtedly the most direct a...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 罗从卫刘玲
Owner 广东卡达克汽车科技有限公司
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