Application of 4,4-bis-1,3,2-dioxazothiophene-2,2-dioxide, and electrolyte and lithium ion battery

A technology of dioxide and electrolyte, which is applied in the field of lithium-ion batteries and electrolytes, can solve the problems of high film resistance and difficulty in effectively improving the fast charging performance and safety performance of lithium-ion batteries, achieve low impedance performance, and improve fast charging performance. Good charging performance and compactness

Active Publication Date: 2019-08-30
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a film-forming agent to the electrolyte to improve the performance of lithium-ion batteries is a commonly used method at present. The existing film-forming additives include vinylene carbonate, 1,3-propane sultone, etc., but these film-forming additives The film-forming resistance of additives is relatively large, and it is difficult to effectively improve the fast charging performance and safety performance of lithium-ion batteries

Method used

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  • Application of 4,4-bis-1,3,2-dioxazothiophene-2,2-dioxide, and electrolyte and lithium ion battery
  • Application of 4,4-bis-1,3,2-dioxazothiophene-2,2-dioxide, and electrolyte and lithium ion battery
  • Application of 4,4-bis-1,3,2-dioxazothiophene-2,2-dioxide, and electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The preparation of electrolyte specifically comprises the following steps:

[0027] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and propylene carbonate (PC) in a mass ratio of 1:1:1 as an organic solvent; add additives to the organic solvent, mix well, add lithium hexafluorophosphate ( LiPF 6 ), to get LiPF 6 The mixed solution with a concentration of 1.1mol / L is the electrolyte.

[0028] Specifically, the additive raw material components and dosage (ie, the mass percentage in the electrolyte) were added as shown in Table 1 to prepare different electrolytes. Among them, BDTD is 4,4-bis-1,3,2-dioxazolethiophene-2,2-dioxide; PS is sodium propargylsulfonate; DTD is 1,3,2-dioxazolethiophene -2,2-dioxide; PST is phthalosulfathiazole.

[0029] Raw material components and consumption of additives in different electrolytes in table 1

[0030]

Embodiment 2

[0032] The preparation of lithium ion battery comprises the following steps:

[0033] (1) Production of positive electrode sheet

[0034] According to the positive electrode active material lithium cobalt oxide (LiCoO 2 ), conductive agent CNT, binder polyvinylidene fluoride in a weight ratio of 97:1.5:1.5, and then fully stirred and mixed with N-methylpyrrolidone solvent to form a uniform positive electrode slurry; The material is coated on the positive electrode current collector Al foil, dried, and cold pressed to obtain the positive electrode sheet.

[0035] (2) Production of negative electrode sheet

[0036] According to the mass ratio of negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber, and thickener sodium carboxymethyl cellulose to 95:2:2:1, take the material, and then fully stir it with an appropriate amount of deionized water Mixing to form a uniform negative electrode slurry; coating the slurry on the ...

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Abstract

The invention discloses an application of 4,4-bis-1,3,2-dioxazothiophene-2,2-dioxide, and electrolyte and a lithium ion battery. The 4,4-bis-1,3,2-dioxazothiophene-2,2-dioxide can be applied to preparation of the electrolyte, when the prepared electrolyte is utilized in the lithium ion battery, the 4,4-bis-1,3,2-dioxazothiophene-2,2-dioxide in the electrolyte can enhance film formation property ofpositive and negative electrode interfaces under the high voltage, a stable passivation film can be formed on positive and negative electrodes of the battery, the passivation film has low impedance property, fast charging property of the lithium ion battery can be improved, film thickness is thin, compactness is good, stability is high, the positive and negative electrode interfaces can be protected, stability of the electrolyte is improved, internal electronics of the battery can be absorbed during the hot box test, heat of reaction is reduced, and safety of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an application of 4,4-bis-1,3,2-dioxazolethiophene-2,2-dioxide, an electrolyte, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are warmly welcomed by consumers due to their significant advantages such as high specific energy, high specific power, long cycle life, and small self-discharge, and have been widely used in 3C electronic products such as mobile communications, digital cameras, and video cameras. With the daily widespread application of lithium-ion batteries, customers have put forward higher requirements for their safety performance and charging speed. Fast-charging lithium-ion batteries are also the development trend of power lithium-ion batteries. Therefore, it is necessary to improve the fast-charging performance and safety of lithium-ion batteries Performance becomes a priority. Adding a film-forming agent to the electrolyte to imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0567H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 杜冬冬李枫李引弟于立娟
Owner HIGHPOWER TECH HUIZHOU
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