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Lithium-ion secondary battery and its electrolyte

A secondary battery and electrolyte technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve the problems of limited improvement effect and deterioration of cycle performance, and achieve the effects of improving storage performance, inhibiting oxidation and decomposition, and improving electrical performance

Active Publication Date: 2017-09-12
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the method of adding succinonitrile or adiponitrile to the electrolyte of lithium-ion secondary batteries is usually used to improve its high-temperature storage performance, but the improvement effect is very limited; in addition, it has been proposed to use olefin nitrile compounds As an electrolyte additive for lithium-ion secondary batteries, although this type of additive can effectively improve the high-temperature storage performance of lithium-ion secondary batteries, it deteriorates its cycle performance.

Method used

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  • Lithium-ion secondary battery and its electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of positive electrode sheet: Lithium cobalt oxide, conductive agent SuperP, and binder PVDF are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a certain viscosity lithium ion secondary battery positive electrode slurry, which is coated on the current collector aluminum foil. The coating weight is 0.0194g / cm 2 , after drying at 85°C, cold pressing; then trimming, cutting, and slitting, drying at 85°C for 4 hours under vacuum conditions, welding the tabs, and making a lithium-ion secondary battery positive electrode that meets the requirements piece.

[0034] Preparation of negative electrode sheet: graphite, conductive agent SuperP, thickener CMC, and binder SBR are made into a slurry at a mass ratio of 96.5:1.0:1.0:1.5, coated on the current collector copper foil and baked at 85°C Dry, the coating weight is 0.0089g / cm 2 ; After trimming, cutting, and slitting, dry at 110° C. for 4 hours under vacuum conditions, and weld the tabs to make a lithium-io...

Embodiment 2

[0038] A lithium ion secondary battery was prepared with reference to the method of Example 1, except that the compound represented by general formula (4) was used instead of the compound represented by general formula (5) in Example 1 when preparing the lithium ion secondary battery electrolyte.

Embodiment 3

[0040] The lithium ion secondary battery was prepared with reference to the method of Example 1, except that the compound represented by the general formula (6) was used instead of the compound represented by the general formula (5) in Example 1 when preparing the lithium ion secondary battery electrolyte.

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Abstract

The invention discloses a lithium ion secondary battery and an electrolyte thereof. The electrolyte comprises lithium salt, a non-aqueous organic solvent and an additive, wherein the additive contains a compound shown in a general formula (I); in the general formula (I), m is an integer of 0 to 2, n is an integer of 1 to 3, R1, R2 and R3 represent hydrogen atoms, fluorine atoms or C1-C6 straight-chain or branched-chain alkyl or fluoro-alkyl, and Rf1, Rf2, Rf3 and Rf4 represent the hydrogen atoms or the fluorine atoms. The compound shown in the general formula (I) can be used for effectively improving a positive pole / electrolyte interface and suppressing the oxidative decomposition of the electrolyte on the surface of a positive pole. Therefore, the storage performance of the lithium ion secondary battery under the condition of high temperature can be improved, and the cycle performance of the battery cannot be degraded, so that the electrical performance of the lithium ion secondary battery is remarkably improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, more specifically, the invention relates to a lithium-ion secondary battery with ideal high-temperature storage performance and its electrolyte. Background technique [0002] Lithium-ion secondary batteries are widely used due to their advantages of high working voltage, long life and fast charging speed. However, with the continuous development of technology, people put forward higher requirements for the energy density of lithium-ion secondary batteries. [0003] On the one hand, in a fully charged state, the negative electrode of the lithium-ion secondary battery has high reducing properties, and the positive electrode has high oxidizing properties. On the other hand, in actual use, factors such as the continuous use of electronic products and the increase in the temperature of the battery environment may cause the battery to be in a high temperature state, which further enhances...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 褚春波付成华王阿忠叶世特韩昌隆吴凯
Owner NINGDE AMPEREX TECH