Composite diaphragm for alkali metal battery and preparation and application thereof

A technology of alkali metal batteries and composite diaphragms, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of diaphragm shrinkage and deformation, increase thermal runaway, and cannot be retained, so as to improve battery efficiency and life, high mechanical Powerful, easy-to-use effects

Active Publication Date: 2020-01-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ceramic coating is still a porous coating, and a large number of pores will still cause the risk of short circuit caused by impurities on the electrode surface or metal dendrites penetrating the pores. At the same time, the loose porous layer cannot retain a complete structure at high temperatures, resulting in the diaphragm still shrinking. deformation, and further increases the risk of thermal runaway

Method used

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  • Composite diaphragm for alkali metal battery and preparation and application thereof
  • Composite diaphragm for alkali metal battery and preparation and application thereof
  • Composite diaphragm for alkali metal battery and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Al that will be coated with a thickness of 2 microns, a porosity of 40%, and a pore size distribution of 0.05-0.1 microns 2 o 3 PP / PE / PP porous film with a thickness of 16 microns, a porosity of 38%, and a pore size distribution of 0.05-0.1 microns (purchased from Shenzhen Kejingzhida Technology Co., Ltd.) of the ceramic coating enters the magnetron sputtering chamber in the form of roll-to-roll in vivo;

[0023] 2) Put lithium phosphate, lithium silicate, and lithium fluoride sputtering targets into 1, 2, and 3 magnetron sputtering targets respectively;

[0024] 3) Set the sputtering parameters: the sputtering vacuum is 1.4Pa, the reaction gas is nitrogen, the deposition power is 120W for target position 1, 90W for target position 2, 70W for target position 3, and the deposition time is 15 minutes;

[0025] 4) Vacuum-deposit an amorphous alkali metal ion conductor inorganic solid layer on the ceramic coating side of the ceramic coating organic diaphragm, and the i...

Embodiment 2

[0027]1) PP / PE / PP coated with a boehmite ceramic coating with a thickness of 2 microns, a porosity of 35%, and a pore size distribution of 0.05-0.1 microns with a thickness of 25 microns, a porosity of 50%, and a pore size distribution of 0.05-0.08 microns Porous film (purchased from Shenzhen Kejing Zhida Technology Co., Ltd.) enters the magnetron sputtering chamber in the form of roll-to-roll;

[0028] 2) Put the sodium phosphate, germanium oxide, and sodium iodide sputtering targets on the 1, 2, and 3 magnetron sputtering target positions respectively;

[0029] 3) Set the sputtering parameters: the sputtering vacuum is 1.5Pa, the reaction gas is nitrogen, the deposition power is 150W for target position 1, 100W for target position 2, 80W for target position 3, and the deposition time is 12 minutes;

[0030] 4) Vacuum-deposit an amorphous alkali metal ion conductor inorganic solid layer on the ceramic coating side of the ceramic coating organic diaphragm, and the inorganic so...

Embodiment 3

[0032] 1) Al that will be coated with a thickness of 2 microns, a porosity of 40%, and a pore size distribution of 0.05-0.1 microns 2 o 3 PP / PE / PP porous film with a thickness of 16 microns, a porosity of 38%, and a pore size distribution of 0.05-0.1 microns (purchased from Shenzhen Kejingzhida Technology Co., Ltd.) of the ceramic coating enters the magnetron sputtering chamber in the form of roll-to-roll in vivo;

[0033] 2) Put the lithium phosphate, germanium oxide, and lithium chloride sputtering targets on the 1, 2, and 3 magnetron sputtering target positions respectively;

[0034] 3) Set the sputtering parameters: the vacuum degree of sputtering is 0.8Pa, the reaction gas is nitrogen, the deposition power is 90W for the first target position, 60W for the second target position, 50W for the third target position, and the deposition time is 10 minutes;

[0035] 4) Vacuum-deposit an amorphous alkali metal ion conductor inorganic solid layer on the ceramic coating side of ...

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Abstract

The invention relates to a composite diaphragm for an alkali metal battery and a preparation method of the composite diaphragm. The composite diaphragm comprises an organic diaphragm matrix layer coated with a ceramic coating and an amorphous alkali metal ion conductor inorganic solid layer, and the preparation method is a vacuum physical deposition method and comprises the following steps of passing an organic diaphragm substrate through a vacuum deposition cavity in a roll-to-roll mode, wherein the vacuum degree of a vacuum box body is 0.5-5 Pa, the reaction gas is nitrogen, the deposition power supply power is 30-180 W, the deposition time is 5-30 min; and depositing to prepare the composite diaphragm. The deposited inorganic solid layer is compact and non-porous, so that the diaphragmhas very strong mechanical property and high-temperature resistance, and the internal short circuit caused by the battery impurities and the metal dendrites and the thermal deformation of the batterydiaphragm can be effectively prevented. Meanwhile, the inorganic solid layer has the alkali metal cation high-speed conduction performance, stability in air and a hetero-ion blocking function, so thatthe safety performance and the cycle life of the battery can be remarkably improved.

Description

technical field [0001] The invention relates to the field of chemical power sources, in particular to a composite diaphragm for an alkali metal battery and a preparation method thereof. Background technique [0002] Chemical power sources are showing more and more important influences in the national economy, especially the rapid development of new energy electric vehicles has promoted the rapid development of secondary batteries. Hybrid electric vehicles and pure electric vehicles powered by lithium-ion secondary batteries have already Large-scale application is realized, but the mileage anxiety brought about by the specific energy limit of lithium-ion batteries limits the development of electric vehicles, and at the same time, the cost of lithium-ion batteries for high-energy vehicles is skyrocketing due to the high price of lithium salts and cobalt salts. Therefore, major international battery manufacturers and R&D institutions are actively developing high-nickel and low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/449H01M50/403H01M50/431H01M50/411Y02E60/10
Inventor 王崇陈剑
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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