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A lithium ion battery janus separator

A lithium-ion battery and separator technology, applied in battery pack components, circuits, electrical components, etc., can solve problems such as the inability to meet the specific requirements of positive and negative plates, battery short-circuit, etc., to improve safety, high temperature cycle performance, and protection. The effect of strong liquid capacity and excellent electrochemical stability

Active Publication Date: 2022-05-13
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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  • A lithium ion battery janus separator
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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. In order to solve the problem that the traditional lithium-ion battery separator easily causes a short circuit inside the battery and cannot meet the specific requirements of positive and negative electrodes, a Janus separator for lithium-ion batteries is provided. The Janus separator for lithium-ion batteries It consists of a high temperature resistant support layer and polar functional layers and nonpolar functional layers loaded on both sides of the high temperature resistant support layer. The Janus separator of the lithium ion battery of the present invention can promote the formation of a more stable and high-quality SEI film on the surface of the negative electrode, which is conducive to the higher capacity and rate performance of the positive electrode material, thereby improving the safety and high-temperature cycle performance of the battery.

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 Patents(China)
IPC IPC(8): H01M50/457H01M50/414H01M50/489H01M50/491
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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