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Anti-flaming ceramic modified size and lithium ion battery membrane coated with same

A technology of lithium ion battery and modified slurry, applied in battery pack components, circuits, coatings, etc., can solve the problems of piercing the film, easy shrinkage, stress concentration, etc., to improve the uniformity of dispersion and reduce heat. The effect of spreading and improving adhesion performance

Inactive Publication Date: 2017-03-22
XUCHENG FUJIAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polyolefin separator has the following disadvantages: 1) high crystallinity, low polarity, and poor affinity with the electrolyte, which is not conducive to the migration of lithium ions and affects the life of the battery
2) When the lithium-ion battery is overcharged, lithium dendrites are likely to be generated on the negative electrode, piercing the film and causing a short circuit
3) Polyolefin is easy to shrink at high temperature, and it is easy to cause a short circuit in the positive and negative contacts, causing the battery to burn or explode
The raw material of the base film for this invention patent application contains organic mixed powder (PP-PI) and inorganic flame retardant. Inorganic particles are easily dispersed unevenly in the organic mixed powder (PP-PI), resulting in stress concentration. It is difficult to form pores or the pore size distribution is uneven, which affects the quality of the diaphragm

Method used

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  • Anti-flaming ceramic modified size and lithium ion battery membrane coated with same
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preparation example Construction

[0051] The preparation method of the flame-retardant ceramic modified powder of the present invention specifically comprises the following steps:

[0052] A: Dilute the silane coupling agent with ethanol and water, wherein the volume ratio of silane coupling agent, ethanol and water is 20-22:70-72:8;

[0053] B: Put the inorganic particles and flame retardant into the stirrer heated to 50-60°C, slowly inject the diluted silane coupling agent into the stirrer with a dropper, stir evenly, and obtain the mixture;

[0054] C: drying the above mixture in a vacuum oven at 50-60° C. for 1-1.5 hours to obtain a flame-retardant ceramic modified powder.

[0055] The lithium-ion battery diaphragm provided by the invention is obtained by coating the flame-retardant ceramic modified slurry prepared by the method of the invention on the surface of a polyolefin microporous membrane to form a coating, and drying to obtain the lithium-ion battery diaphragm. Wherein, the surface modification t...

Embodiment 1

[0058] 1. Preparation of flame-retardant ceramic modified powder: First, take 1.5g of vinyltrimethoxysilane coupling agent, put it into a mixed solution of ethanol and water, stir evenly, and set aside. Wherein the volume ratio of coupling agent: ethanol: water is 20:72:8. Then put 35g of alumina and 15g of melamine polyphosphate into the agitator preheated to 60°C, slowly inject the diluted silane coupling agent into the agitator with a dropper, and stir thoroughly. Finally, it was dried in a vacuum oven at 60° C. for 1 hour to obtain a flame-retardant ceramic modified powder.

[0059] 2. Preparation of flame-retardant ceramic modified slurry: Add flame-retardant ceramic modified powder into a container containing 42.5 g of deionized water, stir at high speed for 30 minutes, and use a ball mill for ball milling. Then add 1 g of sodium hydroxymethyl cellulose and 5 g of polyacrylic acid in sequence, and stir at a high speed to form a flame-retardant ceramic modified slurry. ...

Embodiment 2

[0063] 1. Preparation of flame-retardant ceramic modified powder: First, take 1.5g of vinyltrimethoxysilane, put it into a mixed solution of ethanol and water, stir evenly, and set aside. Wherein the volume ratio of coupling agent: ethanol: water is 20:72:8. Then put 30g of alumina and 20g of ammonium polyphosphate into a stirrer preheated to 60°C, slowly inject the diluted silane coupling agent into the stirrer with a dropper, and stir thoroughly. Finally, it was dried in a vacuum oven at 60° C. for 1 hour to obtain a flame-retardant ceramic modified powder.

[0064] 2. Preparation of flame-retardant ceramic modified slurry: Add flame-retardant ceramic modified powder into a container containing 42.5 g of N-methylpyrrolidone, stir at high speed for 30 minutes, and perform ball milling with a ball mill. Then add 1 g of sodium hydroxymethyl cellulose and 5 g of polyvinylidene fluoride in sequence, and stir at a high speed to form a flame-retardant ceramic modified slurry.

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Abstract

The invention discloses anti-flaming ceramic modified size and a lithium ion battery membrane coated with same. A preparation method of the anti-flaming ceramic modified size comprises the following steps: carrying out surface pretreatment on inorganic particles and a flame retardant by utilizing a silane coupling agent, thus forming anti-flaming ceramic modified powder; then uniformly stirring in a solvent, and carrying out ball milling; sequentially adding a binding agent and a thickening agent, and stirring at high speed, thus forming the anti-flaming ceramic modified size. The lithium ion battery membrane is formed by coating a polyolefin microporous membrane, which is subjected to low-temperature plasma surface modification treatment, with the anti-flaming ceramic modified size. According to the anti-flaming ceramic modified size disclosed by the invention, the problems that a ceramic coating layer is easy to fall off from a membrane and the coating thickness or the surface density is non-uniform are effectively solved; meanwhile, the inorganic particles and the flame retardant in the ceramic coating layer take a synergistic effect, the inorganic particles are used for supporting the lithium ion battery membrane not to shrink when the lithium ion battery membrane is in over-charge heating, and the security of a battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and in particular relates to a modified flame-retardant ceramic slurry and a lithium-ion battery diaphragm coated with the slurry. Background technique [0002] With the promulgation of the "Development Plan for Energy Conservation and New Energy Automobile Industry" and the "Twelfth Five-Year Plan" for Electric Vehicle Technology Development, energy-saving and environmentally friendly new energy has become the main strategic orientation of my country's automobile industry. As an important part of electric vehicles, lithium-ion batteries are in increasing demand. As a key component of lithium-ion batteries, the performance of separator directly affects the capacity, cycle and safety performance of lithium batteries. Therefore, the development and research of high-performance diaphragms is imperative, especially the safety performance of the diaphragm is particularly import...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/18H01M2/16H01M50/446
CPCC09D1/00C09D5/18H01M50/446Y02E60/10
Inventor 郑守扬赵静李文谨
Owner XUCHENG FUJIAN SCI & TECH
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