Heat-sensitive material, electrode and preparation method thereof, and lithium secondary battery

A heat-sensitive material and electrode technology, applied in secondary batteries, secondary battery repair/maintenance, battery electrodes, etc., can solve problems such as thermal runaway, eliminate the possibility of fire or even explosion, improve safety performance, The effect of broad application prospects

Pending Publication Date: 2021-03-09
DONGGUAN CHUANGMING BATTERY TECH
View PDF15 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a heat-sensitive material, an electrode and its preparation method, and a lithium secondary battery, aiming at solving the technical problem that existing lithium secondary batteries are prone to thermal runaway

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Heat-sensitive material, electrode and preparation method thereof, and lithium secondary battery
  • Heat-sensitive material, electrode and preparation method thereof, and lithium secondary battery
  • Heat-sensitive material, electrode and preparation method thereof, and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The embodiment of the present invention also provides a method for preparing an electrode, which includes the following steps:

[0048] S1. Provide heat-sensitive materials, organic solvents and binders. The heat-sensitive materials are the heat-sensitive materials provided by the embodiments of the present invention;

[0049] S2. Mixing the heat-sensitive material with an organic solvent and a binder to obtain a slurry;

[0050] S3. Providing an electrode base, the electrode base includes a current collector and an active layer laminated on the surface of the current collector, coating the slurry on the surface of the electrode base, and drying to obtain an electrode.

[0051] Specifically, in S1, the heat-sensitive material is the heat-sensitive material provided by the embodiment of the present invention, which may only contain polythiophene or its derivatives, or may additionally be added with a conductive agent and / or a lithium source. The content and specific sel...

Embodiment 1

[0063] This embodiment provides a method for preparing a heat-sensitive material and a lithium secondary battery, the steps are as follows:

[0064] (11) Mix poly-3-decylthiophene, Super P and lithium oxide according to a mass ratio of 90:7:3 to obtain a thermosensitive material;

[0065] (12) Mix and stir the heat-sensitive material obtained in step (11) with N-methylpyrrolidone and polyvinylidene fluoride, and the mass ratio of heat-sensitive material to N-methylpyrrolidone and polyvinylidene fluoride is 70:29:1 , get slurry;

[0066] (13) Provide a positive electrode substrate, the positive electrode substrate is a conventional positive electrode sheet in the field, apply the slurry obtained in step (12) on the front and back of the positive electrode sheet, and dry at 50 ° C to form a thickness of 1μm heat-sensitive material layer to obtain positive electrode;

[0067] (14) Assemble the positive electrode obtained in step (13) with a conventional negative electrode, sepa...

Embodiment 2

[0069] This embodiment is basically the same as Embodiment 1, except that the thickness of the heat-sensitive material layer formed is 3 μm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of functional materials, and particularly relates to a heat-sensitive material, an electrode, a preparation method of the electrode and a lithium secondarybattery. According to the heat-sensitive material, polythiophene or a polythiophene derivative is added, so lithium ion diffusion and electron transmission performance are not influenced at normal temperature; when the ambient temperature rises to a certain temperature, the internal resistance of the polythiophene and derivatives thereof can be obviously increased, so that the diffusion of lithium ions and the transmission of electrons are blocked. The heat-sensitive material provided by the invention is a positive temperature coefficient heat-sensitive material, and the resistivity of the heat-sensitive material can be increased along with the rise of the temperature. The heat-sensitive material can be coated on the surface of an electrode to form a heat-sensitive material layer, when the obtained lithium secondary battery is subjected to thermal runaway and the internal temperature rises rapidly, the internal resistance of the heat-sensitive material layer is increased remarkably tobecome an insulating layer, further thermal runaway is prevented, and the safety performance of the battery is improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a thermosensitive material, an electrode and a preparation method thereof, and a lithium secondary battery. Background technique [0002] As the field and scope of lithium secondary battery applications are expanding, the requirements for its safety performance are also getting higher and higher. High-safety lithium-ion batteries can greatly ensure the safety of the use environment and users, and greatly reduce production losses. [0003] The safe failure of lithium secondary batteries is mainly due to thermal runaway, which causes fire or even explosion. When thermal runaway occurs in a lithium-ion battery, it is easy to cause a short circuit between the positive and negative electrodes due to the shrinkage or melting of the diaphragm, which will cause a large amount of heat to be released instantly inside the battery cell, resulting in thermal runaway....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/581H01M4/13H01M4/139H01M10/0525H01M10/42H01C7/02
CPCH01M4/13H01M4/139H01M10/0525H01M10/4235H01C7/027Y02E60/10
Inventor 管晓梅赵悠曼
Owner DONGGUAN CHUANGMING BATTERY TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap