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Electrolyte and lithium-ion battery comprising same

An electrolyte and lithium salt technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as low oxidation potential, deterioration of lithium-ion battery cycle performance, and intensified electrochemical reactions, so as to inhibit oxidation reactions, Improve the effect of high-rate charging performance, high-temperature storage and cycle performance improvement

Active Publication Date: 2016-10-12
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Linear carboxylate has the characteristics of low melting point and low viscosity, which can effectively improve the high-rate charging characteristics of lithium-ion batteries at room temperature and low temperature, and can effectively reduce the DC internal resistance of the battery to reduce the temperature rise in the charging process, but linear carboxylate There is an inevitable chemical reaction between the acid ester and the negative electrode of the lithium-ion battery, which seriously deteriorates the cycle performance of the lithium-ion battery; and the oxidation potential of the linear carboxylate is lower than that of the linear carbonate, especially at high voltage, the linear carboxylate The electrochemical reaction at the positive electrode intensifies

Method used

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Examples

Experimental program
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Embodiment 1

[0115] The preparation of embodiment 1 lithium ion battery

[0116] In Comparative Examples 1# to 11# and Examples 1 to 32, lithium-ion batteries (hereinafter referred to as batteries) were prepared according to the following method:

[0117] (1) Preparation of electrolyte

[0118] In an argon atmosphere glove box with water content <10ppm, mix the organic solvent that has been rectified, dehydrated and purified evenly, dissolve the fully dried lithium salt in the above mixed organic solvent, then add additives to the organic solvent, and mix evenly , to obtain the electrolyte. Wherein, the concentration of the lithium salt is 1 mol / L.

[0119] (2) Preparation of positive pole piece

[0120] Lithium cobalt oxide (LiCoO 2 ) positive electrode active material, binder (PVDF), and conductive agent (acetylene black) are mixed according to the mass ratio of 98:1:1, N-methylpyrrolidone (NMP) solvent is added until the system becomes uniform and transparent, and the vacuum mixer i...

Embodiment 2

[0157] The electrolyte is prepared according to the method in Example 1, the difference is that the formula of the electrolyte is as shown in Table 4, wherein the organic solvent contains EC, PC, DEC and the compound shown in Formula V, and the compound shown in Formula V is shown in Table 4 As shown, the lithium salt is 1M LiPF 6 ;

[0158] Wherein, the content of the additive is the weight percentage calculated based on the total weight of the electrolyte.

[0159] Table 4:

[0160]

[0161]

[0162] Wherein, in the electrolyte solution 33-35, EC:PC:DEC:Formula V=20:20:30:30;

[0163] In the electrolyte solution 36-38, EC:PC:DEC:Formula V=20:20:20:40;

[0164] In the electrolyte solution 39-41, EC:PC:DEC:Formula V=20:15:15:50;

[0165] In electrolyte solutions 42-44, EC:PC:DEC:Formula V=20:10:10:60.

[0166] The lithium-ion battery was prepared by using the electrolyte in Table 4, and the properties of the prepared lithium-ion battery were similar to those of Exam...

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Abstract

The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte and a lithium-ion battery comprising the same. An organic solvent contains linear or branched chain carboxylic ester; an additive contains a di-polyester compound and a cyclic sulfate compound; and the di-polyester compound comprises a carbonic ester dipolymer, a carboxylic ester dipolymer and a sultone dipolymer. The linear or branched chain carboxylic ester with a low solidifying point, low viscosity and a high dielectric coefficient is adopted as the solvent for improving the high-rate charging performance of the lithium-ion battery. The cycle performance and the charging performance of the battery can be improved by cyclic sulfate lactone added to the electrolyte; continuous oxidation reaction of the linear or branched chain carboxylic ester on a positive electrode under high voltage can be inhibited by the di-polyester compound added to the electrolyte; and high-temperature storage performance deterioration of the battery caused by cyclic sulfate is effectively improved.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular, to an electrolyte and a lithium-ion battery containing the electrolyte. Background technique [0002] In the rapidly developing information age, the demand for electronic products such as mobile phones, notebooks, and cameras is increasing year by year. In addition, the application of lithium-ion batteries in electric vehicles, hybrid vehicles, and energy storage equipment has also been actively developed. As the working power source of electronic products, lithium-ion batteries have the characteristics of high energy density, no memory effect, and high working voltage, and are gradually replacing traditional Ni-Cd and MH-Ni batteries. The energy density of lithium-ion batteries has been greatly improved compared to before, but it still cannot meet the needs of users for long-term use of electronic products such as mobile phones. Manufacturers increase the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 陈培培张明付成华周艳唐超
Owner NINGDE AMPEREX TECH
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