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Lithium ion battery Janus diaphragm

A lithium-ion battery and separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as battery short circuit, inability to meet the specific needs of positive and negative plates, and achieve improved safety, improved safety and high temperature. Effects of Cycling Performance, High Capacity and Rate Capability

Active Publication Date: 2020-12-15
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the traditional lithium-ion battery separator is easy to cause internal short circuit of the battery and cannot meet the specific requirements of the positive and negative electrodes, the invention provides a high-temperature-resistant lithium-ion battery Janus separator with both polar and non-polar functional layers

Method used

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Embodiment 1

[0029] Such as figure 1 As shown, a Janus separator for a lithium-ion battery is composed of a high-temperature-resistant support layer 1 and a polar functional layer 2 and a non-polar functional layer 3 supported on both sides of the high-temperature-resistant support layer. The polyimide prepared by electrospinning is used as the high-temperature-resistant support layer, the surface-grafted polyacrylic acid induced by ultraviolet rays is used as the polar functional layer, and the surface-coated polytetrafluoroethylene-hexafluoropropylene is used as the non-solvent-induced phase inversion method. The non-polar functional layer obtains the Janus diaphragm of lithium ion battery, and this Janus diaphragm thickness is 18 μ m, porosity 45.7%, thermal shrinkage rate 0.0% (150 ℃, 2h), the surface energy of polar functional layer is 45.8mN / m, non-polar The surface energy of the polar functional layer was 16.3 mN / m.

Embodiment 2

[0031] Such as figure 1 As shown, a Janus separator for a lithium-ion battery is composed of a high-temperature-resistant support layer 1 and a polar functional layer 2 and a non-polar functional layer 3 supported on both sides of the high-temperature-resistant support layer. Titanium oxide prepared by laser etching is used as a high-temperature resistant support layer, the surface is coated with polyethylene oxide as a polar functional layer, and the interface polymerized polyperfluoroethylene propylene is used as a non-polar functional layer to obtain a Janus separator for lithium-ion batteries , the thickness of the Janus separator is 5 μm, the porosity is 25%, the thermal shrinkage rate is 0.5% (150°C, 2h), the surface energy of the polar functional layer is 60.5mN / m, and the surface energy of the non-polar functional layer is 15.8mN / m m.

Embodiment 3

[0033] Such as figure 1As shown, a Janus separator for a lithium-ion battery is composed of a high-temperature-resistant support layer 1 and a polar functional layer 2 and a non-polar functional layer 3 supported on both sides of the high-temperature-resistant support layer. The polyether ether ketone prepared by melt-blown spinning is used as the high-temperature resistant support layer, the chemical vapor deposition 1:1 triethylenetetramine and polypropylene oxide is used as the polar functional layer, and the chemically grafted graphene is used as the non-polar layer. The functional layer obtains the Janus diaphragm of lithium ion battery, and the thickness of the Janus diaphragm is 50 μm, the porosity is 65%, the heat shrinkage rate is 0.2% (150°C, 2h), and the surface energy of the polar functional layer is 55.6mN / m, and the nonpolar The surface energy of the functional layer was 13.8 mN / m.

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Abstract

The invention relates to the technical field of lithium ion batteries and provides a lithium ion battery Janus diaphragm in order to solve problems that a traditional lithium ion battery diaphragm easily causes internal short circuit of a battery and cannot meet specific requirements of a positive plate and a negative plate. The lithium ion battery Janus diaphragm is composed of a high-temperature-resistant supporting layer, and a polar functional layer and a non-polar functional layer which are loaded on two sides of the high-temperature-resistant supporting layer. The lithium ion battery Janus diaphragm provided by the invention can promote formation of a more stable and high-quality SEI film on a surface of a negative electrode, and is beneficial to exertion of higher capacity and ratecapability of a positive electrode material, so safety and high-temperature cycle performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a Janus separator for lithium-ion batteries. Background technique [0002] Separator, one of the four key components of lithium-ion batteries, plays the basic function of isolating the positive and negative electrodes and providing ion transmission channels inside the battery, usually a polyolefin film with a porous structure. Porous membranes based on polyolefins, such as PE and PP, are the mainstream products in the current lithium-ion battery separator market. On the one hand, due to the lack of rigid groups in the molecular structure, the polyolefin separator has severe thermal shrinkage characteristics, which is easy to cause internal short circuit in the battery; on the other hand, due to the lack of polar groups in the molecular structure, the electrolyte wettability of the polyolefin separator It is poor, which affects the liquid injection effect and ion tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 宋有志刘涛宋明饶绍建李凡群
Owner WANXIANG 123 CO LTD
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