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Binder for lithium ion battery diaphragm, preparation method and diaphragm using the same

A lithium-ion battery and binder technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of poor thermal stability, prone to internal short circuit, etc., achieve high heat resistance, improve thermal stability and Heat shrinkage resistance, the effect of improving mechanical properties

Active Publication Date: 2014-11-12
SHANGHAI FANNENG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a binder for lithium-ion battery diaphragm, which is mixed with inorganic substances as a diaphragm coating, so as to solve the problem of easy internal short circuit caused by the poor thermal stability of existing lithium-ion battery diaphragms

Method used

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  • Binder for lithium ion battery diaphragm, preparation method and diaphragm using the same
  • Binder for lithium ion battery diaphragm, preparation method and diaphragm using the same
  • Binder for lithium ion battery diaphragm, preparation method and diaphragm using the same

Examples

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Embodiment 1

[0035] The binder for the lithium-ion battery diaphragm of the present embodiment comprises raw materials of the following weight: polyethylene oxide 1g, acrylonitrile 1g, butylene glycol acrylate 2g, potassium persulfate 0.02g, epoxy butyl oleate 10g, Deionized water 10g.

[0036] The preparation method of the binder for the lithium-ion battery separator of the present embodiment comprises the following steps:

[0037] 1) Take 1g of polyethylene oxide and place it in 10g of deionized water, raise the temperature to 100°C, stir to dissolve it completely, and obtain solution A;

[0038] 2) After the solution A obtained in step 1) cools down, take 1g of acrylonitrile (hard segment monomer) and 2g of butylene glycol acrylate (soft segment monomer) and add them to solution A in sequence, and then, under the protection of nitrogen, Add 0.02g of potassium persulfate to initiate polymerization, and stir at 100°C to carry out the polymerization reaction. The reaction time is 6 hours, a...

Embodiment 2

[0047] The binder for lithium-ion battery separator of the present embodiment comprises the raw material of following weight: polyvinyl alcohol 1g, acrylonitrile 1g, diethylene glycol methyl ether methacrylate 2g, ammonium persulfate 0.01g, triethyl phosphate 10g, deionized water 10g.

[0048] The preparation method of the binder for the lithium-ion battery separator of the present embodiment comprises the following steps:

[0049] 1) Take 1g of polyvinyl alcohol and place it in 10g of deionized water, raise the temperature to 70°C, stir to dissolve it completely, and obtain solution A;

[0050] 2) After the solution A obtained in step 1) cools down, add 1g of acrylonitrile (hard segment monomer) and 2g of diethylene glycol methyl ether methacrylate (soft segment monomer) into solution A in sequence, Under the protection of nitrogen, add 0.01g of ammonium persulfate to initiate polymerization, and stir at 70°C to carry out the polymerization reaction. The reaction time is 10 ...

Embodiment 3

[0059] The binder for lithium-ion battery separator of the present embodiment comprises the raw material of following weight: polyvinylpyrrolidone 0.5g, vinyl acetate 2g, styrene 1g, potassium persulfate 0.01g, diethylene glycol benzoic acid 10g of ester, 10g of deionized water.

[0060] The preparation method of the binder for the lithium-ion battery separator of the present embodiment comprises the following steps:

[0061] 1) Take 1g of polyvinylpyrrolidone and place it in 10g of deionized water, raise the temperature to 90°C, stir to dissolve it completely, and obtain solution A;

[0062] 2) After the solution A obtained in step 1) cools down, add 2g of vinyl acetate (soft segment monomer) and 1g of styrene (rigid segment monomer) to solution A in sequence, and then add 0.01g of potassium persulfate initiates polymerization, and under the condition of 70°C, the polymerization reaction is carried out with stirring, the reaction time is 10h, and a white emulsion is obtained...

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Abstract

The invention discloses a binder for a lithium ion battery diaphragm, a preparation method and a diaphragm using the same. The binder comprises the following raw materials by weight: 0.5-1 part of a water-soluble polymer, 1-10 parts of a flexible segment monomer, 1-10 parts of a rigid segment monomer, 0.01-0.05 part of an initiator, and 1-10 parts of a plasticizer. The binder for the lithium ion battery diaphragm provided by the invention can be mixed with an inorganic matter to serve as a coating material of the lithium ion battery diaphragm, and the thermal stability and anti-thermal shrinkage performance of the diaphragm can be improved, so that the likely internal short circuit problem caused by poor thermal stability of the existing lithium ion battery diaphragms can be solved, and the diaphragm can have good safety and overcharge tolerance. At the same time, the binder contains polar groups, which can closely bonds with the inorganic matter to improve the wettability and liquid retention of the diaphragm. The flexible segment is introduced while the rigid segment exists, thereby improving the mechanical properties of the binder and guaranteeing the bonding force and the flexibility of the diaphragm.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery separators, and in particular relates to a binder for lithium-ion battery separators, and also relates to a preparation method of the binder for lithium-ion battery separators and a separator using the binder. Background technique [0002] Due to its high specific energy density, lithium-ion batteries have become a hot research topic in the electrochemical industry. The cathode of this type of battery contains transition metal oxides such as manganese, cobalt, vanadium or nickel, which can be described as LiMn in the simplest stoichiometry. 2 o 4 、LiCoO 2 , LiV 2 o 5 or LiNiO 2 , It also includes transition metal phosphates, silicates, etc., which have developed rapidly in recent years such as iron, manganese, cobalt, vanadium or nickel. These compounds react reversibly with compounds (such as graphite) capable of incorporating lithium ions in the lattice, removing lithium ions f...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F261/04C08F271/02C09D151/08C09D151/00C09D7/12H01M2/16
CPCY02E60/10
Inventor 白莉张海峰张国军王海文怀永建
Owner SHANGHAI FANNENG NEW MATERIAL TECH CO LTD
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