Non-aqueous electrolyte and lithium ion battery containing same

A non-aqueous electrolyte and lithium-ion battery technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of limited battery performance improvement, and achieve a wide electrochemical window of the product, good negative electrode film-forming performance, and inhibition of reaction Effect

Active Publication Date: 2016-10-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problem that the additives used in the non-aqueous electrolyte in the lithium-ion secondary battery in the prior art have limited performance improvement of the battery

Method used

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  • Non-aqueous electrolyte and lithium ion battery containing same
  • Non-aqueous electrolyte and lithium ion battery containing same

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preparation example Construction

[0023] The preparation method of the non-aqueous electrolyte provided by the present invention is a common method used by those skilled in the art, that is, to mix all components (including lithium salt, non-aqueous solvent and additives) uniformly, and the present invention is not particularly limited.

[0024] The present invention also provides a lithium-ion battery, including a casing, an electric core contained in the casing, and a non-aqueous electrolyte. The electric core includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, wherein the non-aqueous electrolyte The aqueous electrolyte is the non-aqueous electrolyte provided by the present invention. Compared with non-aqueous electrolytes using other common additives in the prior art, the non-aqueous electrolyte obtained by adding the specific additives in the same amount in the present invention can greatly improve the high-temperature performance o...

Embodiment 1

[0028] (1) Preparation of non-aqueous electrolyte

[0029] Mix ethylene carbonate (EC), diethyl carbonate (DEC), trimethylsilyl isocyanate (TMSIT), and triethyl orthoacetate (TEOA) at a mass ratio of 30:50:5:15 in the mixed solvent , adding the solute LiPF 6 , to make a non-aqueous electrolyte with a lithium salt content of 1.0 mol / L, denoted as S1.

[0030] (2) Preparation of Li-ion battery

[0031] LiCoO 2 , Conductive materials such as acetylene black, binder PVDF at 85:10:5 and an appropriate amount of NMP (N-methylpyrrolidone) are stirred into a slurry, which is applied to a 20 μm thick aluminum foil, dried and pressed to obtain a positive electrode sheet. The positive electrode piece is obtained after spot welding the tabs.

[0032] Mix graphite (type P15B) with SBR and CMC at a weight ratio of 100:3:2, and use deionized water as a solvent to obtain anode material paste. Apply it on a 12 μm thick copper foil, dry it, press it to obtain a negative electrode sheet, an...

Embodiment 2-7

[0035]Non-aqueous electrolytes S2-S7 and lithium-ion batteries S20-S70 were prepared in the same steps as in Example 1, the difference being that in step (1), trimethylsilyl isocyanate (TMSIT), orthoacetic acid The ratio of triethyl ester (TEOA) is shown in Table 1.

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Abstract

The invention provides a non-aqueous electrolyte including: lithium salt, a non-aqueous solvent and an additive which includes trimethsilane isocyanate and orthoester. The invention also provides a lithium ion battery containing the non-aqueous electrolyte. The trimethsilane isocyanate and the orthoester serve as special additives in the electrolyte, which effectively improve high-temperature performance of the battery. The non-aqueous electrolyte with equal-amount addition of the special additives, compared with non-aqueous electrolytes with other common additives in the prior art, can greatly improve the high-temperature performance of the produced battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a nonaqueous electrolytic solution and a lithium ion battery containing the nonaqueous electrolytic solution. Background technique [0002] Lithium-ion secondary battery is a new type of chemical power source. It is widely used in portable electronic products such as mobile phones because of its characteristics of high energy density, high working voltage, long life and no environmental pollution. Safety issues are the main obstacles restricting the development of lithium-ion batteries in the direction of large-scale and high-energy. Especially in recent years, the application of lithium-ion secondary batteries in vehicles such as power vehicles requires more and more comprehensive requirements for their safety and so on. [0003] When the current common lithium-ion secondary batteries are used under high temperature conditions, the electrodes will react with the non-aqueous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 黄荣刚乔飞燕王圣钟海敏任建新
Owner BYD CO LTD
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