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Lithium-ion battery film-forming additive composition and non-aqueous electrolyte and lithium-ion battery

A lithium-ion battery and non-aqueous electrolyte technology, which is applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of film layer breakage, low electrolyte conductivity, and high electrolyte viscosity, etc., to achieve Effects of improving service life, good cycle performance and rate discharge performance

Active Publication Date: 2020-09-15
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use new solvents to replace existing solvents, or lead to low conductivity of the electrolyte, or make the viscosity of the electrolyte relatively high
Although it is a good compromise to extend the service life of the electrolyte to a certain extent by adding a positive electrode film-forming protective agent, when the currently used film-forming agent is applied to a high-voltage lithium-ion battery, it will be on the positive electrode of the battery. After the film is formed, it is continuously applied under high voltage, causing the film layer to be continuously degraded, and eventually the film layer is broken, which makes it difficult to prolong the service life of lithium-ion batteries under high voltage

Method used

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  • Lithium-ion battery film-forming additive composition and non-aqueous electrolyte and lithium-ion battery
  • Lithium-ion battery film-forming additive composition and non-aqueous electrolyte and lithium-ion battery
  • Lithium-ion battery film-forming additive composition and non-aqueous electrolyte and lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0079] (1) Preparation of non-aqueous electrolyte

[0080] The pteridine type compound that present embodiment adopts is:

[0081] The sulfone used in this example is

[0082] Lithium hexafluorophosphate (LiPF 6 ) is dissolved in ethylene carbonate (EC) and diethyl carbonate (DEC), then add pteridine type compound and sulfone, mix uniformly, thus obtain the non-aqueous electrolytic solution according to the present invention. Wherein, based on the total amount of non-aqueous electrolytic solution, the content of lithium hexafluorophosphate is 12% by weight, the content of pteridine type compound is 0.1% by weight, the content of sulfone is 0.35% by weight, and the content of ethylene carbonate and diethyl carbonate Based on the total amount, the content of ethylene carbonate was 20% by weight.

[0083] (2) Preparation of lithium ion battery

[0084] In this example, a metal lithium sheet with a thickness of 600 μm was used as the negative electrode, and a polyethylene / ...

Embodiment 2

[0091] Adopt the method identical with embodiment 1 to prepare non-aqueous electrolytic solution and lithium ion battery, difference is, in step (1), the pteridine type compound that adopts is: Furthermore, the content of the pteridine-type compound was 0.5% by weight based on the total amount of the non-aqueous electrolytic solution.

Embodiment 3

[0093] Adopt the method identical with embodiment 1 to prepare non-aqueous electrolytic solution and lithium ion battery, difference is, in step (1), the pteridine type compound that adopts is: In addition, the content of the pteridine-type compound was 1% by weight based on the total amount of the non-aqueous electrolytic solution.

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Abstract

The invention discloses a lithium ion battery film forming additive composition, which comprises a pteridine compound and a sulfone, wherein the weight ratio of the sulfone to the pteridine compound is 0.035-100: 1, wherein that pteridine-type compound is selected from the group consisting of compound represented by formula I, and the sulfone is selected from the group consisting of compound represented by formula II and compounds represented by formula III. The invention also discloses a non-aqueous electrolyte containing the composition and a lithium ion battery using the non-aqueous electrolyte. A lithium ion battery employing a non-aqueous electrolyte containing the film forming additive composition according to the present invention exhibits a significantly improved service life, goodcycle performance and rate discharge performance even at high voltages.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries. Specifically, the present invention relates to a film-forming additive composition for lithium ion batteries. The present invention also relates to a non-aqueous electrolytic solution comprising the composition and a lithium battery using the non-aqueous electrolytic solution. ion battery. Background technique [0002] Since its birth in the 1990s, lithium-ion batteries have developed rapidly. Generally, a lithium-ion battery includes an electrode group and a non-aqueous electrolyte, and the electrode group includes a positive electrode, a negative electrode, and a separator for separating the positive electrode and the negative electrode. When the battery is charged, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte, and vice versa during discharge. Lithium ion batteries have repeated migration of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 乔飞燕杨洋钟海敏李冰王圣
Owner BYD CO LTD
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