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Piezoelectric composite diaphragm for lithium metal battery as well as preparation method and application of piezoelectric composite diaphragm

A lithium metal battery and piezoelectric composite technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problem of poor affinity between polyolefin diaphragm and electrolyte, weak ability of lithium dendrite growth, unfavorable lithium ion Deposition and other issues, to achieve controllable and multiplier performance improvement, improve transmission capacity, and good application effect

Pending Publication Date: 2022-05-20
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems caused by the poor affinity between the existing polyolefin diaphragm and the electrolyte, the low migration number of lithium ions, the weak ability to inhibit the growth of lithium dendrites, and the existing method of directly coating ceramic particles or as a filler. Pores are blocked, which is not conducive to the technical problem of lithium ion deposition, and a piezoelectric composite diaphragm for lithium metal batteries and its preparation method and application are provided

Method used

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  • Piezoelectric composite diaphragm for lithium metal battery as well as preparation method and application of piezoelectric composite diaphragm
  • Piezoelectric composite diaphragm for lithium metal battery as well as preparation method and application of piezoelectric composite diaphragm
  • Piezoelectric composite diaphragm for lithium metal battery as well as preparation method and application of piezoelectric composite diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1. A piezoelectric composite diaphragm for a lithium metal battery in this embodiment is prepared from polyvinylidene fluoride-hexafluoropropylene powder, barium titanate particles, acetone and deionized water. Prepared by doctor blade coating and DC voltage polarization, the mass ratio of the barium titanate particles to polyvinylidene fluoride-hexafluoropropylene powder is 5:100, the particle size of the barium titanate particles is 300nm, the The molecular weight of polyvinylidene fluoride-hexafluoropropylene powder is 600,000.

[0047] The method for preparing the lithium metal battery piezoelectric composite separator of Example 1 is carried out in the following steps:

[0048] Step 1: Disperse the barium titanate particles in acetone, and ultrasonically treat them for 1 hour at room temperature to obtain a piezoelectric ceramic dispersion;

[0049] Step 2: Add polyvinylidene fluoride-hexafluoropropylene powder into the piezoelectric ceramic dispersion ...

Embodiment 2

[0053] Example 2. The difference between this example and Example 1 is that the mass ratio of the barium titanate particles to the polyvinylidene fluoride-hexafluoropropylene powder is 10:100. Other steps and parameters are the same as in Example 1.

Embodiment 3

[0054] Example 3. The difference between this example and Example 1 is that the mass ratio of the barium titanate particles to the polyvinylidene fluoride-hexafluoropropylene powder is 20:100. Other steps and parameters are the same as in Example 1.

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Abstract

The invention discloses a piezoelectric composite diaphragm for a lithium metal battery as well as a preparation method and application thereof. The invention belongs to the field of lithium ion battery diaphragms. The invention aims to solve the technical problems that the existing polyolefin diaphragm is poor in affinity with electrolyte, low in lithium ion transference number and weak in lithium dendrite growth inhibition capability, and the existing modification method that ceramic particles are directly coated or used as a filler causes diaphragm pore blockage, so that lithium ion deposition is not facilitated. According to the invention, a polyvinylidene fluoride base material is used as a diaphragm base material, and piezoelectric ceramic particles are mixed with the diaphragm base material, so that the piezoelectric composite diaphragm which is consistent in morphology, controllable in porosity, excellent in piezoelectric property, good in electrolyte absorption rate and good in wettability is prepared. In the lithium ion deposition process, the piezoelectric composite diaphragm is extruded by lithium dendrites, lithium ion deposition sites can be optimized through the piezoelectric effect of the diaphragm, growth of the lithium dendrites is inhibited, the cycle life of the lithium metal battery is prolonged, and the application requirement of the diaphragm in the field of the lithium metal battery can be met.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery diaphragms, and in particular relates to a piezoelectric composite diaphragm for a lithium metal battery and a preparation method and application thereof. Background technique [0002] As an important part of energy conversion, the application of chemical power sources is becoming more and more extensive. Among them, lithium-ion batteries are widely used in the field of consumer electronics due to their advantages such as high operating voltage, high energy density, long cycle life, and no memory effect. It has quickly replaced other secondary batteries, and has also begun commercial applications in fields such as electric vehicles, hybrid vehicles, and large-scale energy storage. In the context of many countries announcing that they will abandon gasoline or diesel-fueled vehicles by 2040, people are placing higher demands on the energy density, endurance and safety of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/411H01M50/434H01M50/403H01M50/491H01M10/0525
CPCH01M50/411H01M50/434H01M50/403H01M50/491H01M10/0525Y02E60/10
Inventor 何伟东吉元鹏刘远鹏董运发韩杰才杨春晖
Owner HARBIN INST OF TECH
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