Nonaqueous electrolyte solution and lithium ion battery containing the same

A non-aqueous electrolyte, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems such as poor high temperature performance, and achieve the effects of improving compatibility, improving capacity attenuation, thickness expansion, and stable structure

Active Publication Date: 2017-04-26
BYD CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention solves the technical problem of poor high-temperature performance of non-aqueous electrolyte and high-voltage-resistant additives in lithium-ion secondary batteries in the prior art, and provides a method that can effectively improve the high-voltage cycle life of lithium-ion batteries at normal temperature and inhibit lithium-ion batteries. The expansion of the ion battery can improve the high-voltage cycle performance and high-voltage storage performance of the battery at high temperature. The non-aqueous electrolyte and the lithium-ion battery containing the non-aqueous electrolyte

Method used

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  • Nonaqueous electrolyte solution and lithium ion battery containing the same
  • Nonaqueous electrolyte solution and lithium ion battery containing the same
  • Nonaqueous electrolyte solution and lithium ion battery containing the same

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preparation example Construction

[0021] 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.

[0022] The electrolyte additive of the present invention may also contain other substances, such as other types of functional additives, which are not limited in the present invention.

[0023]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. The nonaqueous electrolytic solution obtained by the specific addit...

Embodiment 1

[0030] (1) Electrolyte preparation: Mix EC, DEC, and EMC at a mass ratio of 1:1:1 as a solvent, add 1mol / L lithium hexafluorophosphate as a lithium salt, and add 0.5wt% of the additive methyl-[3-(1,1 , 3,3,3-pentamethyl-disiloxane base)-propyl]-methyl carbamate to prepare an electrolyte.

[0031] (2) Preparation of positive electrode sheet: LiMn 1.5 Ni 0.5 o 4 Mix well with conductive agent and adhesive at a weight ratio of 97:2:1, add solvent to make positive electrode slurry, evenly coat on aluminum foil, dry, roll, cut and weld aluminum strip composite tabs Positive sheet.

[0032] (3) Preparation of negative electrode sheet: Mix graphite, conductive agent, and binder uniformly in a weight ratio of 96:2:2, add solvent to prepare negative electrode slurry, evenly coat copper foil, dry, and roll , cutting and welding the nickel strip composite tab to make the negative electrode sheet.

[0033] (4) Preparation of battery: The positive electrode and negative electrode prep...

Embodiment 2

[0035] Others are the same as in Example 1, the additive is ethyl-[3-(1,1,3,3,3-pentaethyl-disiloxane)-propyl]-urethane, and the content is 1.5wt %.

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Abstract

The invention provides a nonaqueous electrolyte solution, which includes a lithium salt, a nonaqueous solvent and an additive. The additive contains disiloxane carbamate. The invention also provides a lithium ion battery using the nonaqueous electrolyte solution. The nonaqueous electrolyte solution provided by the invention adopts disiloxane carbamate as the specific additive, can effectively enhance the high voltage cycle life of the lithium ion battery under normal temperature and inhibit the expansion effect of the lithium ion battery, and also can improve the high voltage cycle performance and high voltage storage performance of the battery at high temperature.

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
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 刘卫平朱小明何珍
Owner BYD CO LTD
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