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Lithium ion battery membrane diaphragm and preparation method thereof

A lithium-ion battery and separator technology, applied in the field of lithium-ion battery membrane separator and its preparation, can solve the problems of unsatisfactory pore size distribution and the need to improve the consistency of the separator

Inactive Publication Date: 2019-11-05
高芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the prior art, the common problem of the diaphragm is that the consistency needs to be improved
The porosity and pore size distribution of uniaxially stretched domestic PP separators are relatively close to those of benchmark products; the porosity of biaxially stretched PE separators is usually lower than that of benchmark products, and the pore size distribution is not ideal

Method used

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  • Lithium ion battery membrane diaphragm and preparation method thereof

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Effect test

Embodiment 1

[0024] A lithium-ion battery membrane diaphragm, a ceramic layer composite diaphragm with a three-dimensional network structure, its composition includes the following raw materials by weight: SiO 2 0.5 parts, Al 2 o 3 1 part, TiO 2 2 parts, PVDF powder 0.01 part and ceramic powder 1 part.

[0025] The liquid absorption rate of the lithium-ion battery membrane diaphragm is ≥ 80%.

[0026] The specific surface area of ​​the lithium-ion battery membrane diaphragm is ≥ 4.0, and D50 ≥ 0.6 μm.

[0027] The membrane rupture temperature of the lithium-ion battery membrane separator is ≥180°C.

[0028] The pore diameter of the lithium-ion battery membrane separator is ≤0.2 μm.

[0029] The purity of the lithium-ion battery diaphragm ceramics is more than or equal to 99.99.

[0030] The iron content of the lithium-ion battery membrane separator is less than 10ppm.

[0031] A kind of preparation method of lithium ion battery diaphragm of the present invention comprises the fol...

Embodiment 2

[0034] A lithium-ion battery membrane diaphragm, a ceramic layer composite diaphragm with a three-dimensional network structure, its composition includes the following raw materials by weight: SiO 2 0.7 parts, Al 2 o 3 2 parts, TiO 2 3 parts, 0.02 parts of PVDF powder and 2 parts of ceramic powder.

[0035] The liquid absorption rate of the lithium-ion battery membrane diaphragm is ≥ 80%.

[0036] The specific surface area of ​​the lithium-ion battery membrane diaphragm is ≥ 4.0, and D50 ≥ 0.6 μm.

[0037] The membrane rupture temperature of the lithium-ion battery membrane separator is ≥180°C.

[0038] The pore diameter of the lithium-ion battery membrane separator is ≤0.2 μm.

[0039] The purity of the lithium-ion battery diaphragm ceramics is more than or equal to 99.99.

[0040] The iron content of the lithium-ion battery membrane separator is less than 10ppm.

[0041] A kind of preparation method of lithium ion battery diaphragm of the present invention comprise...

Embodiment 3

[0044] A lithium-ion battery membrane diaphragm, a ceramic layer composite diaphragm with a three-dimensional network structure, its composition includes the following raw materials by weight: SiO 2 1 copy, Al 2 o 3 3 parts, TiO 2 4 parts, 0.03 parts of PVDF powder and 3 parts of ceramic powder.

[0045] The liquid absorption rate of the lithium-ion battery membrane diaphragm is ≥ 80%.

[0046] The specific surface area of ​​the lithium-ion battery membrane diaphragm is ≥ 4.0, and D50 ≥ 0.6 μm.

[0047] The membrane rupture temperature of the lithium-ion battery membrane separator is ≥180°C.

[0048] The pore diameter of the lithium-ion battery membrane separator is ≤0.2 μm.

[0049] The purity of the lithium-ion battery diaphragm ceramics is more than or equal to 99.99.

[0050] The iron content of the lithium-ion battery membrane separator is less than 10ppm.

[0051] A kind of preparation method of lithium ion battery diaphragm of the present invention comprises t...

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Abstract

The invention discloses a lithium ion battery membrane diaphragm and a preparation method thereof, belongs to the technical field of lithium batteries, and particularly relates to a ceramic layer composite diaphragm of a three-dimensional network structure. The diaphragm comprises the following raw materials in parts by weight: 0.5 to 1 part of SiO2, 1 to 3 parts of Al2O3, 2 to 4 parts of TiO2, 0.01 to 0.03 part of PVDF powder and 1 to 3 parts of ceramic powder. The invention also provides a preparation method of the lithium ion battery membrane diaphragm. According to a modified ceramic coating with the hierarchical pore structure, the specific surface area of the diaphragm material is increased by controlling the three-dimensional reticular porous structure, so that the wettability of the electrolyte diaphragm material is improved; and through the research and development of a novel binder, the bonding strength of ceramic components and the diaphragm is improved, and the conductivityof lithium ions is improved. The ceramic layer composite diaphragm of the three-dimensional network structure is prepared; the composite diaphragm is applied to the working property of a lithium ionpower battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a lithium ion battery diaphragm and a preparation method thereof. Background technique [0002] At present, in the prior art, the common problem of diaphragms is that the consistency needs to be improved. Consistency is mainly reflected in irregular defects, thickness, porosity, pore distribution and pore size distribution. The uniaxially stretched domestic PP separator is relatively close to the benchmark product in terms of porosity and pore size distribution; the biaxially stretched PE separator is usually lower in porosity than the benchmark product, and the pore size distribution is not ideal. Contents of the invention [0003] The purpose of the present invention is to overcome the defects in the prior art, to provide a lithium-ion battery membrane diaphragm and its preparation method, a modified ceramic coating with a multi-level porous structure, and to increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/403H01M50/431H01M50/449Y02E60/10
Inventor 高保清舒均国陈立新高芳
Owner 高芳
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