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Lithium ion secondary battery and electrolyte thereof

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 the interface

Active Publication Date: 2013-12-11
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 pro

Method used

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  • Lithium ion secondary battery and electrolyte thereof
  • Lithium ion secondary battery and electrolyte thereof
  • Lithium ion secondary battery and electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] The preparation of the positive electrode sheet: The lithium cobaltate, the conductive agent SuperP, and the adhesive PVDF are uniformly mixed in a mass ratio of 96:2.0:2.0 to make a lithium ion secondary battery positive slurry with a certain viscosity, and then coated on the current collector aluminum foil. The coating amount is 0.0194g / cm 2 , After drying at 85 ℃, cold pressing; then after trimming, cutting, and slitting, drying at 85 ℃ for 4 hours under vacuum conditions, welding the tabs, and forming a lithium ion secondary battery positive electrode that meets the requirements sheet.

[0035] The preparation of the negative electrode sheet: the graphite, the conductive agent SuperP, the thickening agent CMC, and the adhesive SBR are made into a slurry at a mass ratio of 96.5:1.0:1.0:1.5, and then coated on the current collector copper foil and baked at 85°C Dry, the coating amount is 0.0089g / cm 2 ; After trimming, cutting, and slitting, it is dried ...

Example Embodiment

[0038] Example 2

[0039] The lithium ion secondary battery was prepared according to the method of Example 1, except that the compound represented by the general formula (10) was used instead of the compound represented by the general formula (11) in Example 1 when preparing the electrolyte for the lithium ion secondary battery.

Example Embodiment

[0040] Example 3

[0041] The lithium ion secondary battery was prepared according to the method of Example 1, except that the compound represented by the general formula (12) was used instead of the compound represented by the general formula (11) in Example 1 when preparing the electrolyte of the lithium ion secondary battery.

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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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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
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