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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 problem of lower storage characteristics of lithium-ion secondary batteries, and achieve the effect of improving high-temperature storage characteristics and reducing reactions

Active Publication Date: 2018-02-23
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experimental results show that: when the voltage is less than 4.2V, 1,3-propane sultone (PS) can effectively improve the storage characteristics of lithium-ion secondary batteries, but when the voltage is higher than 4.4V, lithium The storage characteristics of ion secondary batteries are significantly reduced

Method used

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  • Lithium-ion secondary battery and its electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of lithium-ion secondary battery cathode sheet: Lithium cobalt oxide, conductive agent SuperP, binder PVDF are uniformly mixed with N-methylpyrrolidone (NMP) at a mass ratio of 96:2.0:2.0 to make a cathode slurry; the anode slurry The material is evenly coated on the aluminum foil of the positive electrode current collector, and the coating amount is 0.0194g / cm 2 , after drying at 85°C, cold pressing; after trimming, cutting, and slitting, dry at 85°C for 4 hours under vacuum conditions, and weld the tabs to make the positive electrode sheet of the lithium-ion secondary battery.

[0025] Preparation of lithium-ion secondary battery negative electrode sheet: uniformly mix graphite with conductive agent SuperP, thickener CMC, binder SBR with pure water at a mass ratio of 96.5:1.0:1.0:1.5 to make negative electrode slurry; negative electrode slurry Evenly coated on the negative electrode current collector copper foil and dried at 85°C, the coating weight is 0.0...

Embodiment 2

[0029] Preparation of lithium-ion secondary battery cathode sheet: same as Example 1;

[0030] Preparation of lithium-ion secondary battery negative plate: same as Example 1;

[0031] Preparation of lithium-ion secondary battery electrolyte: replace tripropylcyanoborate in Example 1 with dimethyl-propionitrile borate, and the rest are the same as Example 1;

[0032]Preparation of lithium ion secondary battery: same as Example 1.

Embodiment 3

[0034] Preparation of lithium-ion secondary battery cathode sheet: same as Example 1;

[0035] Preparation of lithium-ion secondary battery negative plate: same as Example 1;

[0036] Preparation of lithium-ion secondary battery electrolyte: replace the tripropylcyanoborate in Example 1 with two (trifluoromethyl)-propionitrile borates, and the rest are the same as in Example 1;

[0037] Preparation of lithium ion secondary battery: same as Example 1.

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Abstract

The invention discloses lithium ion secondary battery electrolyte. The lithium ion secondary battery electrolyte comprises a non-aqueous solvent, lithium salt and an additive, wherein the additive contains 1, 3-propane sultone and compound containing a cyanogroup boric acid ester structure; and the compound containing the cyanogroup boric acid ester structure is expressed through a general formula (1), a general formula (2) or a general formula (3) (which is as shown in the description). In the general formula (1), the general formula (2) and the general formula (3), n is an integer from 1 to 5; R1 and R2 are hydrogen or C1 to C6 alkyl group; and hydrogen atoms on the alkyl group can be totally or partially substituted by fluorine atoms. The lithium ion secondary battery electrolyte can restrain the oxidation reaction between the electrolyte and a positive electrode active material, and improve the storage characteristic of a lithium ion secondary battery in conditions of high temperature and high pressure. The invention also discloses a lithium ion secondary battery.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, more specifically, the present invention relates to a lithium ion secondary battery with good storage characteristics under high temperature and high pressure conditions and its electrolyte. Background technique [0002] Lithium-ion secondary batteries have the advantages of high operating voltage, long service life, and fast charging speed, so they are widely used in various electronic devices. However, with the continuous development of science and technology, people require lithium-ion secondary batteries to have higher energy density, and increasing the working voltage of lithium-ion secondary batteries is one of the effective ways to increase their energy density. [0003] In a lithium-ion secondary battery, after charging, the metal oxide as the positive electrode active material shows very strong oxidizing properties at high potentials, and it is easy to oxidize with the electroly...

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 褚春波付成华赵丰刚王阿忠叶世特韩昌隆
Owner NINGDE AMPEREX TECH
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