Lithium-ion secondary battery and its separator

A secondary battery and separator technology, applied in secondary batteries, battery components, circuits, etc., can solve problems such as poor electrolyte affinity, affecting the cycle performance of lithium-ion secondary batteries, rate performance, and low ion conductivity

Active Publication Date: 2016-04-06
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of polyolefin as a separator are poor electrolyte affinity and low ion conductivity, which seriously affect the cycle performance and rate performance of lithium-ion secondary batteries.

Method used

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  • Lithium-ion secondary battery and its separator

Examples

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Effect test

preparation example Construction

[0034] The first method for preparing a separator for a lithium ion secondary battery according to the second aspect of the present invention is used to prepare a separator having the structure of formula 1, comprising the steps of: (1) high-energy irradiation: irradiating a polymer substrate with High-energy irradiation is performed indoors to generate free radicals to obtain a polymer substrate with free radicals; (2) the first grafting: the polymer substrate with free radicals is immersed in a solution containing monomer B to carry out The first grafting reaction obtains the polymer substrate after the first grafting; (3) the second grafting: the polymer substrate after the first grafting is immersed in a solution containing halogenated hydrocarbons Carry out the second grafting reaction to obtain the polymer base material after the second grafting; (4) drying: drying the obtained polymer base material to obtain an isolation film, and the obtained isolation film has the stru...

Embodiment 1

[0109] A Preparation of Separator for Lithium Ion Secondary Batteries

[0110] (1) Put the polymer-based polyethylene film after removing surface impurities 60 Irradiated in a Coγ-ray irradiation room with a dose of 65KGy to obtain a polyethylene film with free radicals;

[0111](2) Immerse the polyethylene film with free radicals in the N,N-dimethylformamide solution of vinylpyridine (monomer B) with a mass fraction of 50%, and after deoxidizing with nitrogen, at 60°C The reaction was carried out in a constant temperature water bath for 12 hours to obtain the polyethylene film after the first grafting. By weighing the quality of the polyethylene film before and after the grafting and taking the weight of the polyethylene film as 100%, the calculated grafting rate was 5.10%;

[0112] (3) Immerse the polyethylene film after the first grafting in the N,N-dimethylformamide solution of benzyl bromide (halogenated hydrocarbon) with a mass fraction of 37%, and react in a constant t...

Embodiment 2

[0124] A lithium ion secondary battery was prepared according to the method of Example 1, except that:

[0125] A Preparation of Separator for Lithium Ion Secondary Batteries

[0126] (1) The polymer substrate is polypropylene film, and the irradiation dose is 76KGy;

[0127] (2) Monomer B is vinylthiophene, the solvent used is N-methylpyrrolidone (NMP), the mass fraction of monomer B is 65%, the temperature of the constant temperature water bath is 80°C, the reaction time is 23h, and the graft ratio is is 5.90%;

[0128] (3) The halogenated hydrocarbon is biphenyl dichlorobenzyl, the solvent used is N-methylpyrrolidone (NMP), the mass fraction of the halogenated hydrocarbon is 35%, the temperature of the constant temperature water bath is 100°C, the reaction time is 20h, and then the The branch rate is 5.71%;

[0129] (4) Lithium salt is LiAsF 6 , the solvent used is ethylene carbonate, the mass fraction of lithium salt is 10%, the temperature of the constant temperature ...

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Abstract

The invention provides a lithium ion secondary battery and a separator thereof. The separator of the lithium ion secondary battery includes a polymer substrate, and the surface of the polymer substrate contains a compound having an onium salt structure. The lithium ion secondary battery comprises: a positive electrode sheet; a negative electrode sheet; a separator, spaced between the positive electrode sheet and the negative electrode sheet; and an electrolyte. Wherein, the separator is the separator of the aforementioned lithium ion secondary battery. The separator of the invention has high ion conductivity and electrolyte absorption capacity, and the lithium ion secondary battery of the invention has good rate performance and normal temperature cycle performance.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a lithium ion secondary battery and a separator thereof. Background technique [0002] Lithium-ion secondary batteries are currently widely used in mobile phones, notebooks, tablet computers, electric vehicles and other fields. Compared with lead-acid batteries and nickel-metal hydride batteries, lithium-ion secondary batteries have the advantages of environmental friendliness, high energy density, long cycle life, and high voltage. Generally, a lithium ion secondary battery is composed of a positive electrode sheet, a negative electrode sheet, a separator, and an electrolyte. Among them, the separator connects and separates the positive electrode sheet and the negative electrode sheet, allowing ions to pass through and isolating electrons. Therefore, the performance of the separator determines the interface structure and internal resistance of the lithium ion seconda...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/414H01M50/497
CPCH01M10/0525H01M50/411Y02E60/10
Inventor 伍永彬程晟牛少军申红光何东铭
Owner NINGDE AMPEREX TECH
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