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Flame-retardant structure, preparation method thereof and lithium battery structure

A kind of flame retardant, organic technology, used in the field of flame retardant structure and its preparation, lithium battery structure, can solve the problems of thermal safety, battery thermal runaway and so on

Pending Publication Date: 2021-04-13
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a flame-retardant structure and its preparation method, and lithium battery structure for the problems of battery thermal runaway and thermal safety.

Method used

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  • Flame-retardant structure, preparation method thereof and lithium battery structure
  • Flame-retardant structure, preparation method thereof and lithium battery structure
  • Flame-retardant structure, preparation method thereof and lithium battery structure

Examples

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Effect test

Embodiment 1

[0040] refer to figure 1 , this embodiment provides a flame retardant structure 100, the flame retardant structure 100 includes a flame retardant membrane layer 101 and a polyethylene microsphere film layer 102.

[0041] The flame retardant membrane layer 101 includes an organic polymer layer 1011 and a flame retardant 1012 disposed in the organic polymer layer 1011 . Specifically, the flame retardant membrane layer 101 may be a fiber membrane with a shell-core structure, the organic polymer layer 1011 is the shell, and the flame retardant 1012 inside the organic polymer is the core. The fiber structure can be prepared by electrospinning process. When a certain high temperature condition is met, the organic polymer layer 1011 melts, and the internal flame retardant 1012 is released, so that the environment where the flame retardant structure 100 is located will not ignite or explode.

[0042] The polyethylene microsphere film layer 102 includes a mixture of polyethylene micr...

Embodiment 2

[0055] This embodiment provides a method for preparing a flame-retardant structure 100, referring to figure 2 , the preparation method of the flame retardant structure 100 includes the following steps:

[0056] Step S20 , making the mixture of the organic polymer and the flame retardant 1012 into a flame retardant membrane layer 101 with a fibrous structure.

[0057] The formed flame retardant membrane layer 101 is a fiber membrane with shell-core structure, the organic polymer is the shell, and the flame retardant 1012 inside the organic polymer is the core. The fiber structure can be prepared by electrospinning process. When a certain high temperature condition is met, the organic polymer layer 1011 melts, and the flame retardant 1012 inside is released, so that the environment where the flame retardant structure 100 is located does not catch fire or explode, avoiding thermal safety problems.

[0058] Step S22 , coating the mixture of polyethylene microspheres 1021 and or...

Embodiment 3

[0078] This embodiment provides a lithium battery structure, with reference to Figure 4 , the lithium battery structure includes a positive electrode 200 , a negative electrode 300 and a flame retardant structure 100 .

[0079] The flame retardant structure 100 is arranged between the positive electrode 200 and the negative electrode 300. The flame retardant structure 100 includes a flame retardant membrane layer 101 and a polyethylene microsphere film layer 102 arranged on the outer surface of the flame retardant membrane layer 101. The flame retardant membrane layer 101 includes organic The polymer layer 1011 and the flame retardant 1012 disposed in the organic polymer layer 1011 , the polyethylene microsphere film layer 102 includes a mixture of polyethylene microspheres 1021 and an organic solvent 1022 . Wherein, the polyethylene microsphere film layer 102 can be arranged on the outer surface of the side of the flame-retardant membrane layer 101 facing the negative electr...

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Abstract

The invention relates to the technical field of energy storage, and particularly discloses a flame-retardant structure, a preparation method thereof and a lithium battery structure. The flame-retardant structure comprises a flame-retardant diaphragm layer and a polyethylene microsphere film layer, wherein the flame-retardant diaphragm layer comprises an organic polymer layer and a flame retardant arranged in the organic polymer layer; and the polyethylene microsphere film layer comprises a mixture of polyethylene microspheres and an organic solvent and is arranged on the outer surface of the flame-retardant diaphragm layer. When the flame-retardant structure is applied to the lithium battery, the lithium battery still has certain discharge capacity in the thermal runaway process of the lithium battery, and the polyethylene microsphere film layer in the flame-retardant structure can be molten to cover the surface of the negative electrode of the battery along with continuous temperature rise of the lithium battery, so that transmission of lithium ions is blocked, and thermal runaway is inhibited. When the temperature rises continuously, the flame retardant in the flame-retardant diaphragm layer is released, so that the electrolyte is non-flammable, fire and explosion are avoided, the anode and cathode materials can still be recycled, and the problem of resource waste is solved. In addition, the flame-retardant structure is compatible with electrochemical performance of the battery.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a flame-retardant structure, a preparation method thereof, and a lithium battery structure. Background technique [0002] Lithium-ion batteries have already occupied my country's electric vehicle market, and will also be widely used in the grid energy storage market, which is one of the key technologies to solve current energy problems. However, frequent battery fire and explosion accidents have drawn people's attention to thermal runaway and thermal safety issues. [0003] For the thermal runaway process of the battery cell, the first thing that happens is the decomposition of the solid electrolyte film on the surface of the negative electrode, then the reaction and heat generation between the negative electrode and the electrolyte, the melting of the diaphragm, and then the thermal runaway of the positive electrode material and the decomposition of the electrolyte , As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/411H01M50/443H01M50/417H01M50/451H01M50/44H01M50/403H01M10/0525A62C3/16
CPCH01M10/0525A62C3/16H01M2200/10Y02E60/10
Inventor 赵宇明丁庆
Owner SHENZHEN POWER SUPPLY BUREAU
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