Lithium-ion battery electrolyte and lithium-ion battery containing same

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of high temperature storage performance and poor cycle performance, and achieve the effects of improved cycle performance, good thermal stability, and inhibition of decomposition

Active Publication Date: 2010-02-24
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of poor high-temperature storage performance and cycle performance of existing lithium-ion batteries, and provide a new type of electrolyte that can improve high-temperature storage performance and cycle performance of lithium-ion batteries

Method used

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  • Lithium-ion battery electrolyte and lithium-ion battery containing same
  • Lithium-ion battery electrolyte and lithium-ion battery containing same
  • Lithium-ion battery electrolyte and lithium-ion battery containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0032] (1) Preparation of electrolyte

[0033] Add 4.65g of vinylene carbonate (VC) solvent to 200g of EC and DEC ratio 1:1 solution, then add 28.47g of LiPF 6 , to prepare the body electrolyte, and then add 2.33g of common commercial LiFOB and 4.66g of vinyl sulfone to it and mix evenly to prepare the experimental electrolyte.

[0034] In the non-aqueous electrolyte, the LiFOB in the mixed additive accounts for 1% by mass of the electrolyte, and the VS is 2%.

[0035] (2) Preparation of positive electrode

[0036] 90 grams of polyvinylidene fluoride (Atofina, 761#PVDF) was dissolved in 1350 grams of N-methyl-2-pyrrolidone (NMP) solvent to prepare a binder solution, and then 2895 grams of LiCoO 2(manufactured by FMC Company) was added to the above solution, and mixed well to obtain a positive electrode slurry, which was ev...

Embodiment 2

[0042] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0043] Lithium-ion batteries were prepared according to the method of Example 1, wherein the difference was that the quality of additives added in the preparation of the electrolyte was different, wherein LiFOB was 11.6 g and VS was 4.66 g.

[0044] In this non-aqueous electrolyte, the LiFOB in the mixed additive accounts for 5% by mass of the electrolyte, and the VS is 2%.

[0045] The final lithium-ion battery A2 of size LP053450AR.

Embodiment 3

[0047] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0048] Lithium-ion batteries were prepared according to the method of Example 1, wherein the difference was that the quality of additives added in the preparation of the electrolyte was different, wherein LiFOB was 4.66 g, and VS was 4.66 g.

[0049] In this non-aqueous electrolyte, the LiFOB in the mixed additive accounts for 2% by mass of the electrolyte, and the VS is 2%.

[0050] The lithium-ion battery A3 of size LP053450AR finally made.

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Abstract

The invention provides a lithium-ion battery electrolyte and a lithium-ion battery containing the same. The electrolyte comprises a solvent and a lithium salt electrolyte, further comprises an addition agent LiFOB and an alkylene unsaturated compound of which the boiling point is between 180 DEG C and 250 DEG C, wherein the alkylene unsaturated compound is one or more of divinyl sulfone and dimethyl sulphoxide. The electrolyte provided by the invention can effectively improve high-temperature storage performance and cycle performance of the lithium-ion battery prepared by using the electrolyte.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] In recent years, the miniaturization and light weight of mobile information terminals such as mobile phones, notebook computers, and PDAs are rapidly developing, and the requirements for their power sources are also getting higher and higher. Lithium-ion batteries have great advantages in this regard. The main components of lithium-ion batteries, such as positive electrode materials, negative electrode materials, and electrolytes, have undergone great development. The research on the influence of electrolyte on various properties of lithium-ion batteries, including safety, cycle performance, storage performance, and charge-discharge performance, is increasingly in-depth. [0003] Lithium hexafluorophosphate (LiPF 6 ) is the most commonly used lithium salt in the electrolyte of lithium-ion batteries, but lithium hex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40
Inventor 杨鹏范艺雷磊
Owner SHANGHAI BYD
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