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A kind of non-aqueous electrolyte and lithium ion battery

A non-aqueous electrolyte and non-aqueous solvent technology, which is applied in the field of lithium-ion batteries, can solve the problems of weak battery high-temperature expansion and degraded battery performance, and achieve low cycle performance, suppression of high-temperature storage flatulence, good high-temperature storage performance and cycle performance. performance effect

Active Publication Date: 2016-05-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The invention solves the technical problem that the antioxidant in the non-aqueous electrolyte solution is weak in improving the high-temperature expansion of the battery and degrades other performances of the battery in the prior art

Method used

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  • A kind of non-aqueous electrolyte and lithium ion battery
  • A kind of non-aqueous electrolyte and lithium ion battery
  • A kind of non-aqueous electrolyte and lithium ion battery

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preparation example Construction

[0039] The preparation method of the non-aqueous electrolytic solution provided by the present invention is a common method for those skilled in the art, that is, mixing the components (including lithium salt, non-aqueous solvent and antioxidant, with or without other additives) uniformly, The present invention is not particularly limited.

[0040] 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.

[0041] Since the preparation process of the negative electrode sheet, the positive electrode sheet, and the separator are well-known technologies in the art, and the assembly of the battery is also a well-known tec...

Embodiment 1

[0044] (1) Preparation of non-aqueous electrolyte:

[0045] Mix EC, DEC, and EMC in a mass ratio of 40:50:10 as a non-aqueous solvent, add 0.9 mol / L lithium hexafluorophosphate as a lithium salt, and add 1% of the total mass of the electrolyte as an antioxidant 2246 (shown in formula 6 Compound), and then add additive VC accounting for 1.5% of the total mass of the electrolyte to obtain the non-aqueous electrolyte S1 of this embodiment.

[0046] (2) Preparation of lithium ion battery:

[0047]Lithium-nickel-cobalt-aluminum-oxygen and lithium-cobalt-oxide are mixed in a ratio of 40:60 by mass as the positive electrode active material, natural graphite and artificial graphite are used as the negative electrode active material in a mass ratio of 85:15, and PP / PE / PP three The separator is an ion-exchange membrane, using the non-aqueous electrolyte S1 of this embodiment, and making a soft-package battery with a model number of SL454261 according to the common method in the industr...

Embodiment 2

[0049] Adopt the same step as embodiment 1 to prepare non-aqueous electrolytic solution S2 and battery S20, difference is:

[0050] In step (1), the amount of antioxidant 2246 accounted for 2.5% of the total mass of the electrolyte.

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Abstract

The invention provides a non-aqueous electrolyte. The non-aqueous electrolyte comprises lithium salt, a non-aqueous solvent, and an antioxidant; and the antioxidant has a structure represented by formula 1 or formula 2, wherein the R1 and R2 individually represent H or an alkyl group with a carbon number of 1 to 5, and the R3 represents an alkyl group with a carbon number of 1 to 5. The invention also provided a lithium ion battery containing the non-aqueous electrolyte. The lithium ion battery containing the non-aqueous electrolyte has a very good high temperature storage performance and cycle performance.

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 batteries stand out from many battery types due to their advantages of high voltage, high capacity, low consumption, no memory effect, pollution-free and small size, and are widely used in many electronic products such as mobile phones, listeners, PDAs, and notebooks. [0003] An electrolyte solution containing an antioxidant is disclosed in the prior art. The antioxidant has a structure shown in formula 3. The antioxidant contains a benzene ring, and a hydroxyl group is attached to the benzene ring. It is a monophenolic antioxidant. agent. The antioxidant can reduce the problem of too much expansion of the battery in a high-temperature environment, but its addition amount should not be too much, otherwise it will cause deter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0566H01M10/0567H01M2300/0025Y02E60/10
Inventor 罗勇梁艳梅梁世硕向红霞
Owner BYD CO LTD