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Core-shell structure oxide coating diaphragm and preparation method thereof

A core-shell structure and oxide technology, which is applied to structural parts, electrochemical generators, electrical components, etc., can solve the problems of reducing the ion conductivity of LIBs, unsatisfactory pore structure, and increased internal resistance of batteries, so as to improve safety Performance and cycle life, inhibition of lithium dendrite formation, effect of good electrochemical performance

Pending Publication Date: 2022-08-05
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, composite diaphragms also have some disadvantages
For example, the thickness of the separator is thicker, the pore structure is not ideal, and the internal resistance of the battery increases
Because inorganic materials can block the pores of the polymer separator, reducing the ionic conductivity of LIBs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The invention provides a preparation method of a core-shell structure oxide-coated diaphragm, which specifically includes the following steps:

[0029] S1) adding 10 mg spherical alumina and 40 mg PVP with a particle size of 50 to 500 nm to 20 ml of deionized water for immersion treatment for 24 h, and centrifugal washing to obtain spherical alumina treated with PVP;

[0030] S2) Add 10 mg of PVP-surface-treated alumina particles into a 0.1-0.5 g / mL aqueous glucose solution and stir well, and perform a hydrothermal reaction at 160-220° C. for 6-10 hours to obtain carbon-coated alumina particles with different thicknesses, The thickness of the carbon layer is 5 to 200 nm;

[0031] S3) Disperse 0.1 g of carbon-coated alumina into a mixed solution of 80 ml of ethanol, 20 ml of deionized water, 1 ml of ammonia water and 0.3 g of CTAB, dilute 0.4 g of tetraethyl silicate into 20 ml of ethanol, and then drop by drop Add it to the dispersion for 6 hours to hydrolyze the coate...

Embodiment 1

[0034]Example 1: First, 10 mg of alumina with a particle size of about 300 nm and 40 mg of PVP were added to 20 mL of deionized water, and then stirred at room temperature for 24 h. PVP-modified alumina was collected by centrifugation at 8000 rpm for 5 min and washed three times with water. 10 g of glucose was completely dissolved in 30 ml of deionized water, then transferred to a 50 ml polytetrafluoroethylene autoclave, and then 10 mg of PVP-modified alumina was added under sonication. After 10 minutes of ultrasonic treatment, the reaction kettle was placed in an oven at 173 °C for 7 h, and then cooled to room temperature naturally. A black solid product was obtained by three rounds of centrifugation / washing / sonication, followed by drying in an oven at 70 °C for 10 h to obtain carbon-coated alumina; then 0.1 g of the carbon-coated alumina prepared above was re-dispersed in a solution containing CTAB ( 0.30 g), deionized water (20 mL), ammonia (1 mL) and ethanol (80 mL) in a ...

Embodiment 2

[0035] Example 2: First, 10 mg of alumina with a particle size of about 100 nm and 40 mg of PVP were added to 20 mL of deionized water, and then stirred at room temperature for 24 h. PVP-modified alumina was collected by centrifugation at 8000 rpm for 5 min and washed three times with water. 8 g of glucose was completely dissolved in 30 ml of deionized water, then transferred to a 50 ml polytetrafluoroethylene autoclave, and then 10 mg of PVP-modified alumina was added under sonication. After ultrasonic treatment for 10 minutes, the reaction kettle was placed in an oven at 173 °C for 6 h, and then cooled to room temperature naturally. A black solid product was obtained by three rounds of centrifugation / washing / sonication, followed by drying in an oven at 70 °C for 10 h to obtain carbon-coated alumina; then 0.1 g of the carbon-coated alumina prepared above was re-dispersed in a solution containing CTAB ( 0.30 g), deionized water (20 mL), ammonia (1 mL) and ethanol (80 mL) in a...

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Abstract

The invention discloses a core-shell structure oxide coating diaphragm and a preparation method thereof. The preparation method comprises the following steps: firstly, obtaining spherical aluminum oxide subjected to PVP (Polyvinyl Pyrrolidone) surface treatment; then adding the aluminum oxide particles subjected to surface treatment into a glucose aqueous solution for hydrothermal reaction to obtain carbon-coated aluminum oxide particles; further coating the carbon-coated spherical aluminum oxide, and calcining in a muffle furnace to obtain porous spherical shell structure coated aluminum oxide powder; and finally, preparing slurry from the coated aluminum oxide powder and a binder in NMP (N-Methyl Pyrrolidone), coating the slurry on the diaphragm by using a scraper, and drying in a vacuum drying oven to obtain the porous oxide coated diaphragm. The oxide coated diaphragm with the spherical shell structure prepared by the invention can avoid the condition of diaphragm pore reduction caused by a traditional solid oxide coated diaphragm, the thermal stability of the coated diaphragm is not lost, the porous spherical shell structure is beneficial to lithium ion transmission, and more uniform gaps can realize rearrangement of lithium ions and inhibit generation of lithium dendrites, so that the performance of the lithium ion battery is improved. The safety performance and the cycle life of the battery are improved.

Description

technical field [0001] The invention relates to the related technical field of secondary batteries, and relates to a high-safety modified diaphragm of a rechargeable battery, in particular to a core-shell structure oxide-coated diaphragm and a preparation method thereof. Background technique [0002] With the rapid development of the industrial revolution and technological innovation, traditional energy sources such as fossil fuels (coal, oil, natural gas, etc.) are far from meeting the needs of human beings, and cause greenhouse effect, acid rain, etc. Environmental pollution not only harms human health, but also destroys economic resources and ecological balance. In order to solve the energy problem, the research and achievements of wind energy, solar energy, tidal energy and geothermal energy have proliferated, but the intermittency and uncontrollability of the above-mentioned sustainable energy cannot meet the large-scale application. Secondary batteries, represented by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/449H01M50/431H01M10/0525
CPCH01M50/403H01M50/449H01M50/431H01M10/0525Y02E60/10
Inventor 刘瑞平刘强汤文皞邓亦锐周苗苗
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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