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Lithium-ion secondary battery, separator and preparation method thereof

A secondary battery and lithium ion technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of low porosity, achieve strong mechanical strength, avoid short circuit, and good electrochemical stability

Active Publication Date: 2018-04-06
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] U.S. Patent No. 6,432,586B1 issued on August 13, 2002 discloses a separator, which is coated with a layer of ceramic composite material on a commonly used polyolefin film, and the ceramic composite layer contains inorganic particles and matrix materials. , can block the growth of dendrites and prevent electronic short circuit, but the porosity of the ceramic composite layer itself is very low

Method used

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  • Lithium-ion secondary battery, separator and preparation method thereof
  • Lithium-ion secondary battery, separator and preparation method thereof
  • Lithium-ion secondary battery, separator and preparation method thereof

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preparation example Construction

[0036] The preparation method of the separator of the lithium ion secondary battery according to the second aspect of the present invention is used to prepare the separator of the lithium ion secondary battery according to the first aspect of the present invention, comprising the steps of: (1) adding water-soluble polymer powder Added into deionized water, stirred evenly to obtain a water-soluble polymer solution; (2) adding the water-soluble solute to the obtained water-soluble polymer solution, stirred evenly at room temperature and performed ultrasonic treatment to obtain a mixed solution, wherein, the The water-soluble solute is a carbonate compound; (3) uniformly coating the obtained mixed solution on at least one surface of the porous substrate, heating and drying to obtain the separator of the lithium-ion secondary battery.

[0037] In the method for preparing a separator for a lithium-ion secondary battery according to the second aspect of the present invention, in step...

Embodiment 1

[0047] 1. Preparation of separator film for lithium-ion secondary battery

[0048] (1) Take 2kg of polyacrylic acid (PAA, water-soluble polymer) with a weight-average molecular weight of 1,000,000, add it to 8kg of deionized water in 3 times, and stir it with a rotating speed of 10r / min during the feeding process. After the feeding is completed, stir for 180 min at a speed of 800 r / min to obtain a water-soluble polymer solution with a mass fraction of 20%;

[0049] (2) Add 2kg ethylene carbonate (EC, water-soluble solute) into the resulting water-soluble polymer solution, and stir at room temperature for 1 hour at a speed of 1000r / min, so that EC is completely dissolved in the water-soluble polymer solution, and then Ultrasonic treatment was carried out for 15 minutes to remove tiny air bubbles in the solution to obtain a mixed solution, which was then sealed and shaded for later use;

[0050] (3) The obtained mixed solution is uniformly coated on one of the surfaces of the p...

Embodiment 2

[0060] Lithium-ion secondary battery is prepared according to the method of Example 1, just in the preparation of the separator of lithium-ion secondary battery (i.e. in step 1):

[0061] (2) The mass of ethylene carbonate is 3kg.

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Abstract

The invention provides a lithium ion secondary battery, its separator and a preparation method. The separator of the lithium ion secondary battery includes: a porous substrate; and a coating coated on at least one surface of the porous substrate. The coating is composed of a water-soluble polymer and a water-soluble solute; the water-soluble polymer is selected from at least one of the polymers containing structure 1 and / or structure 2; the water-soluble solute is a carbonate compound ; The water-soluble solute is miscible with at least one component in the electrolyte of the lithium-ion secondary battery, and the water-soluble solute is miscible with at least one component in the electrolyte of the lithium-ion secondary battery. The locations of the water-soluble solutes of the coating form pores. The separator of the lithium ion secondary battery of the present invention has high ion conductivity and electrochemical stability, and the lithium ion secondary battery of the present invention has good rate performance and safety performance, and simultaneously has low self-discharge.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion secondary battery, a separator and a preparation method thereof. Background technique [0002] At this stage, the wide application of mobile electronic products and information communication equipment makes people's demand for secondary batteries more and more high. Among them, lithium-ion secondary batteries have attracted extensive interest of researchers due to their high energy density, long cycle life, low self-discharge rate and high operating voltage. [0003] The separator is an important part of the lithium-ion secondary battery. It is located between the positive electrode and the negative electrode and isolates the two. Therefore, the separator has a significant impact on the safety performance of the lithium-ion secondary battery. The currently used separator is a porous membrane with a microporous structure, which is conducive to lithium ions passing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/449
CPCY02E60/10
Inventor 孙成栋陈杰郑义江辉魏增斌
Owner CONTEMPORARY AMPEREX TECH CO
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