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Low-impedance lithium battery diaphragm and production method thereof

A lithium battery diaphragm and low impedance technology, which is applied in secondary batteries, battery pack components, secondary battery repair/maintenance, etc., can solve problems such as poor electrolyte wettability, low battery use rate, and large interface impedance. Improve the rate and cycle performance, reduce the interfacial migration resistance, and reduce the effect of interfacial resistance

Inactive Publication Date: 2018-08-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a lithium-ion battery is charged and discharged at a high rate, more lithium ions migrate at the interface of the electrode separator, but the electrode separator has poor wettability to the electrolyte, the interface impedance between the separator and the pole piece is large, and the battery usage rate is low. question

Method used

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  • Low-impedance lithium battery diaphragm and production method thereof
  • Low-impedance lithium battery diaphragm and production method thereof
  • Low-impedance lithium battery diaphragm and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a low-impedance lithium battery diaphragm, comprising the steps of:

[0025] S1. Add 100g tetraethyl orthosilicate to 500mL polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer aqueous solution with a pH value of 7-9 and a concentration of 2mol / L, and stir for 4h , to obtain a stable and evenly dispersed first glue solution;

[0026] S2. Add 2 g of polyvinylidene fluoride into the first glue solution, and stir for 1 hour to obtain a second suspension;

[0027] S3. Apply the second suspension evenly on the surface of a polypropylene film with a thickness of 12 μm, then perform high-temperature aging for 48 hours at a temperature of 100° C., and then elute the template agent with toluene to obtain a low-impedance lithium battery separator.

[0028] The low-impedance lithium battery separator obtained in this embodiment was fabricated by buckling. The ceramic powder was obtained by the same operation as in this embodiment (...

Embodiment 2

[0031] A preparation method of a low-impedance lithium battery diaphragm, comprising the steps of:

[0032] S1. Add 100 g of tetraethyl orthosilicate to 500 mL of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer aqueous solution with a pH value of 7-9 and a concentration of 4 mol / L, and stir for 4 hours , to obtain a stable and evenly dispersed first glue solution;

[0033] S2. Add 2 g of polyvinylidene fluoride into the first glue solution, and stir for 1 hour to obtain a second suspension;

[0034] S3. Apply the second suspension evenly on the surface of a polypropylene film with a thickness of 12 μm, then perform high-temperature aging for 48 hours at a temperature of 100° C., and then elute the template agent with toluene to obtain a low-impedance lithium battery separator.

[0035] The low-impedance lithium battery separator obtained in this embodiment was fabricated by buckling. The ceramic powder was obtained by the same operation as in thi...

Embodiment 3

[0038] A preparation method of a low-impedance lithium battery diaphragm, comprising the steps of:

[0039] S1. Add aluminum isopropoxide into cetyltrimethylammonium bromide aqueous solution with a pH value of 7-9 and a concentration of 1 mol / L, and stir until the solution becomes transparent to obtain the first glue;

[0040] S2, adding a binder into the first glue solution, the mass ratio of the binder to the mesoporous ceramic slurry is 10:100, and stirring evenly to obtain a second suspension;

[0041] S3. The second suspension is evenly coated on the surface of the polyethylene film, followed by high-temperature aging for 24 hours. The high-temperature aging temperature is 120° C., and then the template agent is eluted with ethylene glycol to obtain a low-impedance lithium battery separator.

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Abstract

The invention discloses a low-impedance lithium battery diaphragm. The low-impedance lithium battery diaphragm is composed of a base film, a meso-porous ceramic layer and a binder. The invention alsodiscloses a production method of the low-impedance lithium battery diaphragm. The method comprises the following steps: adding a meso-porous ceramic slurry to an aqueous solution of a template, and performing stirring until the obtained solution is transparent in order to obtain a first glue solution; adding the binder to the first glue solution, and performing uniform stirring to obtain a secondsuspension; and uniformly coating the surface of the base film with the second suspension, performing high temperature aging, and eluting the template by using an organic solvent to obtain the low-resistance lithium battery diaphragm. The surface of the base film is coated with the meso-porous ceramic to improve the wettability of the electrolyte to the diaphragm, and an ion collection layer is formed between the diaphragm and a positive electrode sheet to reduce the interface impedance between the diaphragm and the electrode sheet, so the improvement of the charge and discharge performances and the cycle performances at a large rate is facilitated, and the diaphragm is suitable for being used on power cells.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a low-impedance lithium battery diaphragm and a preparation method thereof. Background technique [0002] The diaphragm plays an important role in separating the positive and negative electrodes of the battery and preventing short circuit in the lithium battery. It is one of the four most important materials of the lithium battery. The separator has a certain pore size distribution, and the pores are filled with electrolyte, and lithium ions shuttle back and forth between the positive and negative electrodes through the electrolyte in the channel. The amount of electrolyte in the separator directly affects the speed and quantity of lithium ion migration. When a lithium-ion battery is charged and discharged at a high rate, more lithium ions migrate at the interface of the electrode separator, but the electrode separator has poor wettability to the electrolyte, the i...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/42H01M50/403H01M50/434H01M50/449H01M50/489
CPCH01M10/0525H01M10/4235H01M50/403H01M50/431H01M50/411H01M50/449Y02E60/10
Inventor 王祖华代北北
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY