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a cr 3 alc 2 Preparation method of /pvdf-pva lithium ion battery separator

A PVDF-PVA, lithium-ion battery technology, applied in secondary batteries, battery components, circuits, etc., can solve the problems of weak conductivity and affect the performance of diaphragm batteries, achieve good conductivity, improve mechanical strength and porosity The effect of the rate and method is simple

Active Publication Date: 2022-07-15
广州明美新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the mechanical properties of the diaphragm are mainly improved by adding ceramic inorganic materials to the diaphragm. Although the addition of inorganic materials can improve the mechanical properties of the diaphragm, the electrical conductivity is generally weak, which will affect the battery performance of the diaphragm.

Method used

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  • a cr <sub>3</sub> alc <sub>2</sub> Preparation method of /pvdf-pva lithium ion battery separator
  • a cr <sub>3</sub> alc <sub>2</sub> Preparation method of /pvdf-pva lithium ion battery separator
  • a cr <sub>3</sub> alc <sub>2</sub> Preparation method of /pvdf-pva lithium ion battery separator

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] a Cr 3 AlC 2 / PVDF-PVA lithium ion battery separator, the preparation method includes the following steps:

[0024] S1: put 40mmol chromium powder, 20mmol aluminum powder and 20mmol graphite powder into a ball mill, stir and mix for 8h, then pass the mixed raw materials through an 80-mesh sieve, put them into a mold, and press into a green body;

[0025] S2: Put the green body into the crucible quickly, put it into the vacuum sintering furnace, calcinate at 1450 ℃ for 3.5h under the protective atmosphere of argon, and obtain Cr after cooling 2 AlC powder;

[0026] S3: Cr obtained from S2 2 AlC powder and 20mmol CrC powder were put into a ball mill, stirred and mixed at 30rpm / min, then pressed into a green body, quickly put into a crucible, put into a vacuum sintering furnace, pressurized to 25kPa, in an argon protective atmosphere calcined at 1250 °C for 5 h, and cooled to obtain Cr 3 AlC 2 powder;

[0027] S4: Add 2g polyvinylidene fluoride to 15ml N,N-dimethylf...

Embodiment 2

[0030] a Cr 3 AlC 2 / PVDF-PVA lithium ion battery separator, the preparation method includes the following steps:

[0031] S1: put 40mmol chromium powder, 20m aluminum powder and 20mmol graphite powder into the ball mill, stir and mix for 6h, then pass the mixed raw material through a 60 mesh sieve, then load it into a mold, and press into a green body;

[0032] S2: Quickly put the green body into the crucible, put it into the vacuum sintering furnace, calcined at 1400 ℃ for 4h under the protective atmosphere of argon, and obtained Cr after cooling 2 AlC powder;

[0033] S3: Cr obtained from S2 2 AlC powder and 20mmol CrC powder were put into a ball mill, stirred and mixed, pressed into a green body, quickly put into a crucible, put into a vacuum sintering furnace, pressurized to 20kPa, calcined at 1200 ℃ for 6h under an argon protective atmosphere, and cooled after get Cr 3 AlC 2 powder;

[0034] S4: Add 2g polyvinylidene fluoride to 10ml N,N-dimethylformamide, stir fo...

Embodiment 3

[0037] a Cr 3 AlC 2 / PVDF-PVA lithium ion battery separator, the preparation method includes the following steps:

[0038] S1: put 40mmol chromium powder, 20mmol aluminum powder and 20mmol graphite powder into a ball mill, stir and mix for 10h, then pass the mixed raw materials through a 60-mesh sieve, put them into a mold, and press into a green body;

[0039] S2: Put the green body into the crucible quickly, put it into the vacuum sintering furnace, and calcine it at 1500℃ for 3h under the protective atmosphere of argon, and obtain Cr after cooling. 2 AlC powder;

[0040] S3: Cr obtained from S2 2 AlC powder and 20mmolCrC powder were put into a ball mill, stirred and mixed, pressed into a green body, quickly put into a crucible, put into a vacuum sintering furnace, pressurized to 30kPa, calcined at 1300 ℃ for 4h in an argon protective atmosphere, and cooled to obtain Cr 3 AlC 2 powder;

[0041] S4: Add 2g of polyvinylidene fluoride to 20ml of N,N-dimethylformamide, st...

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Abstract

The present invention relates to a Cr 3 AlC 2 / The preparation method of PVDF-PVA lithium ion battery separator includes the following raw materials: chromium powder, aluminum powder, graphite powder, chromium carbide, polyvinylidene fluoride, polyvinyl alcohol and N,N-dimethylformamide; the preparation method includes the following Steps: First, calcine chromium powder, aluminum powder and graphite powder at high temperature to obtain Cr 2 AlC, then Cr 2 AlC is calcined at high temperature of chromium carbide to obtain Cr 2 AlC 2 , then loaded into PVDF-PVA mixed solution, spread on glass plate, and dried to obtain Cr 3 AlC 2 / PVDF‑PVA membrane, the prepared membrane is used for lithium-ion battery separator, and has strong mechanical strength, large porosity and good charge-discharge cycle performance.

Description

technical field [0001] The invention relates to the field of diaphragms, in particular, is a kind of Cr 3 AlC 2 / Preparation method of PVDF-PVA lithium ion battery separator. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high output power, and good cycle stability. They have gradually replaced traditional secondary batteries and are called new secondary batteries. Lithium-ion batteries are widely used in 3C products, such as digital cameras, mobile phones, notebook computers, electric bicycles, etc., and also cover major industrial fields such as electric vehicles, energy storage power stations, military equipment, and aerospace. The main components of a lithium-ion battery are a positive electrode, a negative electrode and a separator. Lithium battery separator is one of the key inner layer components in the structure of lithium ion battery. Its performance determines the interface structure, internal resistance an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/489H01M50/491H01M50/497H01M10/0525C04B35/56C04B35/626
CPCH01M10/0525C04B35/56C04B35/62605Y02E60/10
Inventor 陈云蒋天天
Owner 广州明美新能源股份有限公司