Nonwoven fabric ceramic separator, and preparation method and application thereof

A technology of ceramic diaphragm and non-woven fabric, which is applied in the field of electrochemistry, and can solve the problems of powder dropping, affecting the performance of ceramic diaphragm, and poor powder coating uniformity.

Inactive Publication Date: 2017-05-31
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface energy of the ceramic powder, it is easy to agglomerate, and its surface is generally hydrophilic, while the polyolefin membrane is a hydrophobic material. Therefore, the ceramic separator has poor powder coating uniformity, "powder falling", etc. Problems that will affect the performance of ceramic separators in lithium-ion batteries

Method used

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  • Nonwoven fabric ceramic separator, and preparation method and application thereof
  • Nonwoven fabric ceramic separator, and preparation method and application thereof
  • Nonwoven fabric ceramic separator, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take polyvinylidene fluoride-hexafluoropropylene, dissolve it in acetone / NMP solvent with a volume ratio of 1:1, prepare an electrospinning solution with a mass fraction of 17wt%, and perform high-voltage electrospinning with electrospinning equipment . The specific parameters are: positive pole voltage 12KV, negative pole grounded. The injection speed of the syringe pump is 300ul / h. The distance between the spinneret and the collecting plate is 15 cm. The non-woven fiber base film thus obtained is pretreated by RIE oxygen plasma activation (power 50W, treatment time 20s), then quickly transferred to the ALD reaction chamber, evacuated to below 20hPa, and heated to 70°C; Set up the program so that the precursor source and the high-purity water source are alternately pulsed and deposited, the precursor source is passed into the reaction chamber, and then the excess precursor is cleaned with nitrogen, and then water vapor is passed through to hydrolyze the precursor, an...

Embodiment 2

[0056] Take polyvinylidene fluoride, dissolve it in acetone / NMP solvent with a volume ratio of 1:1, prepare an electrospinning solution with a mass fraction of 17 wt%, and perform high-voltage electrospinning with electrospinning equipment. The specific parameters are: positive pole voltage 12KV, negative pole copper plate and grounded. The injection speed of the syringe pump is 300ul / h. The distance between the spinneret and the collecting plate is 15 cm. The non-woven fiber base film obtained in this way was pretreated by RIE oxygen plasma activation (power 50W, treatment time 20s), and then quickly transferred to the ALD reaction chamber, using titanium tetrachloride and high-purity water as the precursor source, Perform double-sided deposition of titanium dioxide with 150 pulse depositions on each side to obtain PVDF@TiO 2 Non-woven ceramic diaphragm.

Embodiment 3

[0058] Take a certain amount of polyvinyl alcohol (PVA), add it into deionized water, heat to 60° C., and keep stirring to prepare a high molecular polymer solution with a mass fraction of 8%. High-voltage electrospinning was performed using an electrospinning device. The specific parameters are: positive pole voltage 12KV, negative pole copper plate and grounded. The injection speed of the syringe pump is 300ul / h. The distance between the spinneret and the collecting plate is 15 cm. The PVA non-woven fiber base film thus obtained. After the above-mentioned non-woven fiber base film was pretreated by RIE oxygen plasma activation (power 50W, treatment time 20s), it was quickly transferred to the ALD reaction chamber, and titanium tetrachloride and high-purity water were used as precursor sources to carry out the oxidation of titanium dioxide. Double-sided deposition, 150 pulse depositions on each side, resulting in PVA@TiO 2 Non-woven ceramic diaphragm.

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Abstract

The invention provides a nonwoven fabric ceramic separator, and a preparation method and application thereof. The preparation method specifically comprises the following steps: preparing a nonwoven fabric fiber base membrane through an electrostatic spinning method; and performing atomic layer deposition on the surface through a plasma enhanced atomic layer deposition technology, so that inorganic matters are uniformly coated on the surface of the polymer fiber to form a core-shell structure taking the one-dimensional polymer fiber as the core and the inorganic matters as the shell. The nonwoven fabric ceramic separator is used in a secondary battery. The separator can be further endowed with a thermal shutdown function through a polymer layer compounding method. The nonwoven fabric ceramic separator obtained by the invention has high thermal shrinkage resistance, enhanced mechanical strength, small membrane ceramic layer thickness and favorable uniformity; and an assembled battery has high mass and volume specific energy and high safety. Thus, the separator provided by the invention can be used as a high safety separator material for lithium ion batteries and other secondary batteries.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a non-woven ceramic diaphragm and a preparation method thereof, and also relates to the application of the ceramic diaphragm in chemical power systems such as lithium ion batteries. Background technique [0002] As a chemical power system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion battery has good economic benefits, social benefits and strategic significance, and has been widely used in mobile communications, Digital products and other fields, and it is very likely to become the most important power supply system in the field of energy storage and electric vehicles. [0003] In lithium-ion batteries, the separator mainly plays the role of preventing positive and negative electrodes from contacting and allowing ion conduction, and is an important part of the battery. At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/409H01M50/44Y02E60/10
Inventor 赵金保张鹏沈秀李超
Owner XIAMEN UNIV
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