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Lithium metal battery diaphragm as well as preparation method and application thereof

A lithium metal battery and diaphragm technology, applied in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as ignoring battery safety, lack of safety, and considerations

Pending Publication Date: 2022-08-02
武汉中原长江科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing improvement work on the separator, the research is almost single from the direction of inhibiting lithium dendrites, without comprehensive consideration of safety, and how to further improve battery safety once lithium dendrites are formed is ignored. Sexual Measures Inquiry

Method used

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  • Lithium metal battery diaphragm as well as preparation method and application thereof
  • Lithium metal battery diaphragm as well as preparation method and application thereof
  • Lithium metal battery diaphragm as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0037]A preparation method of a lithium metal battery separator, comprising the following steps:

[0038] S1) using a wet process to prepare a modified polymer diaphragm filled with reinforcing materials, specifically adding reinforcing materials and additives to the polymer resin material in proportion and mixing them sufficiently, and melting the mixture at high temperature and extruding it into a film, Stretching and extraction steps to obtain a modified polymer diaphragm filled with reinforcing materials;

[0039] S2) The lithium metal battery separator is formed by attaching the lithiophilic material to the side of the modified polymer separator filled with the reinforcing material by using a physical deposition method.

[0040] A lithium metal battery includes a lithium metal battery separator, and a lithiophilic material layer is located on the side of the lithium metal battery separator close to the negative electrode.

Embodiment 1

[0042] (1) Preparation of diaphragm

[0043] Step 1: Mix the ultra-high molecular weight polypropylene powder and the fluororubber 26 powder in a mass ratio of 20:1 to make a mixed powder;

[0044] Step 2: using a wet process known to those skilled in the art to prepare a modified polymer diaphragm filled with reinforcing materials, and the thickness of the diaphragm is 12 μm;

[0045] Step 3: A nano-magnesium layer is deposited on one side of the separator prepared in step 2 by the method of magnetron sputtering, and the thickness of the nano-magnesium layer is 3 μm, that is, the lithium metal battery separator is prepared.

[0046] (2) Battery production

[0047] The above-mentioned separator is used to assemble a lithium metal battery with a positive electrode, a negative electrode, an electrolyte and a casing. The manufacturing method thereof is known to those skilled in the art. One thing that needs special attention is that the lithiophilic material layer of the separat...

Embodiment 2

[0049] (1) Preparation of diaphragm

[0050] Step 1: Mix the ultra-high molecular weight polypropylene powder and the fluororubber 26 powder in a mass ratio of 20:1 to make a mixed powder;

[0051] Step 2: using a wet process known to those skilled in the art to prepare a modified polymer diaphragm filled with reinforcing materials, and the thickness of the diaphragm is 12 μm;

[0052] Step 3: depositing ZnO nanorods on one side of the separator prepared in step 2 by using the seed-mediated method, the thickness of the ZnO nanorod layer is 3 μm, and the lithium metal battery separator is prepared.

[0053] (2) Battery production

[0054] A battery was fabricated in the same manner as in Example 1.

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Abstract

The invention provides a lithium metal battery diaphragm and a preparation method and application thereof, and the lithium metal battery diaphragm comprises a polymer diaphragm base material, a lithium-loving material layer located on the surface of one side of the polymer diaphragm base material, and a reinforcing material filled in the polymer diaphragm base material, the polymer diaphragm base material comprises one or a composite material of more than two of polypropylene, polyethylene and polyvinylidene fluoride; the lithium-loving material layer comprises one or more of a nano metal, an oxide, a carbon material and a polymer; the reinforcing material comprises one or more of rubber, polyimide, polyamide, polyester, polyether, aramid fiber, spandex and inorganic matters, the lithium-loving material layer is deposited on the surface of the diaphragm by filling the reinforcing material in the diaphragm, and the lithium-loving material layer and the reinforcing material have a synergistic effect to induce uniform deposition of lithium on a negative electrode, so that the lithium-loving material layer is more uniform in lithium deposition on the negative electrode; the mechanical strength and heat resistance of the diaphragm are enhanced, the growth of lithium dendrites is inhibited, the lithium dendrites are prevented from puncturing the diaphragm, and the performance and safety of the lithium metal battery are greatly improved.

Description

technical field [0001] The present application relates to the field of lithium batteries, and in particular, to a lithium metal battery separator and a preparation method and application thereof. Background technique [0002] With the increasing miniaturization and light weight of electrical equipment and the demand for long battery life, people have put forward higher requirements for power supply. However, the energy density of lithium-ion batteries increases slowly, making it difficult to meet the requirements of battery life and mileage of electrical equipment. To this end, in recent years, researchers have developed a lithium metal battery technology with higher energy density. The anode material uses lithium metal as the active material or no active material, thereby greatly improving the energy density of the battery. [0003] Compared with traditional lithium-ion batteries, the difference of lithium metal batteries is that lithium ions are deposited on the negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/417H01M50/403H01M10/052
CPCH01M50/449H01M50/417H01M50/403H01M10/052Y02E60/10
Inventor 张靖孟庆飞施樰聂观荣
Owner 武汉中原长江科技发展有限公司
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