Unlock instant, AI-driven research and patent intelligence for your innovation.

A preparation method of lithium-ion battery cathode material with thermal shutdown and self-healing functions

A technology for lithium-ion batteries and cathode materials, which is applied in the field of preparation of lithium-ion battery materials, can solve the problems of difficult coating, uncontrollable thickness of coating layers, and incomplete battery shutdown reaction.

Active Publication Date: 2021-04-23
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to easily and disorderly adhere polythiophene derivatives to the surface of the electrode material by volatilizing the solvent at high temperature. It is difficult to coat the active material with a uniform coating layer, and the thickness of the coating layer is uncontrollable, which may easily cause the battery to shut down. Incomplete response

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
  • A preparation method of lithium-ion battery cathode material with thermal shutdown and self-healing functions
  • A preparation method of lithium-ion battery cathode material with thermal shutdown and self-healing functions
  • A preparation method of lithium-ion battery cathode material with thermal shutdown and self-healing functions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1000g ternary LiNi 0.8 co 0.1 mn 0.1 o 2 The material was added to 1000 mL of 0.2% aqueous solution of sodium dodecylbenzenesulfonate, stirred at room temperature for 1 h, filtered, and dried to obtain LiNi with a negative surface charge. 0.8 co 0.1 mn 0.1 o 2 Material. Then 1000g of negatively charged LiNi on the surface 0.8 co 0.1 mn 0.1 o 2 Disperse the material in 1000mL of methanol solution, dissolve 50g of poly-3-octylpyrrole in 500mL of chloroform, then add it dropwise to the above dispersion, stir at room temperature for 2h, and let stand for 2min to complete the electrostatic self-assembly coating process, filter , dried under vacuum at 80°C to obtain LiNi with a coating thickness of 10nm 0.8 co 0.1 mn 0.1 o 2 The composite material is the anode material of the lithium-ion battery with thermal shutdown and self-healing functions. The resulting LiNi 0.8 co 0.1 mn 0.1 o 2 The transmission electron microscope image of the composite material is s...

Embodiment 2

[0028]1000g ternary LiNi 0.8 co 0.1 Al 0.1 o 2 The material was added to 1000 mL of 0.3% aqueous solution of sodium lauryl sulfate, stirred at room temperature for 1 h, filtered, and dried to obtain LiNi with a negative surface charge. 0.8 co 0.1 Al 0.1 o 2 Material. 1000g ternary LiNi with negative surface charge 0.8 co 0.1 Al 0.1 o 2 The material was dispersed in 2000mL ethanol solution, 20g poly-3-octylthiophene was dissolved in 1000mL dichloromethane, and then added dropwise to the above dispersion liquid, stirred at room temperature for 2h, and left standing for 2min to complete the electrostatic self-assembly coating process , filtered, and dried under vacuum at 80°C to obtain LiNi with a coating thickness of 5nm 0.8 co 0.1 Al 0.1 o 2 The composite material is the anode material of the lithium-ion battery with thermal shutdown and self-healing functions.

Embodiment 3

[0030] 1000g lithium cobalt oxide (LiCoO 2 ) material was added to 1000mL of 0.5% aqueous solution of ethoxyalkyl sodium sulfate, stirred at room temperature for 1h, filtered and dried to obtain LiCoO with negative surface charge 2 Material. 1000g surface negatively charged LiCoO 2 Disperse the material in 1000mL ethanol solution, use poly-3-methylthiophene as the coating material, dissolve 80g poly-3-methylthiophene in 5000mL chloroform, then add it dropwise to the above dispersion, and stir at room temperature for 2h, Stand still for 2 minutes to complete the electrostatic self-assembly coating process, filter, and dry at 80°C in a vacuum to obtain LiCoO with a coating thickness of 20nm. 2 The composite material is the anode material of the lithium-ion battery with thermal shutdown and self-healing functions.

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 discloses a preparation method of a positive electrode material of a lithium ion battery with thermal shutdown and self-healing functions, belonging to the technical field of lithium ion batteries. The cathode material of the lithium ion battery comprises an active material matrix and a coating layer of 3-substituent polypyrrole or 3-substituent polythiophene. On the one hand, the positive electrode material of the lithium ion battery provided by the present invention has a thermal shutdown function. When the temperature of the battery rises abnormally, the 3-substituent polypyrrole or the 3-substituent polythiophene undergoes thermal dedoping and changes from a conductive state to an insulating state. The electronic transmission between the material and the surrounding particles is cut off, the battery material loses its activity, and the battery reaction is shut down to avoid thermal runaway of the battery. On the other hand, the positive electrode material of the lithium ion battery provided by the present invention has a self-healing function; after the battery is turned off, when the battery temperature returns to normal, the electrochemical heavy doping of 3-substituent polypyrrole or 3-substituent polythiophene occurs, and the insulating The state is transformed into a conductive state, and the activity of the battery material is restored.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a lithium-ion battery material with thermal shutdown and self-healing functions. Background technique [0002] With the increasing application of lithium-ion batteries in vehicles, fires and burning accidents of electric vehicles caused by power batteries have occurred from time to time, which has aroused people's doubts about the safety of lithium-ion batteries. Safety issues have become the main obstacle restricting the commercial application of large-capacity lithium-ion batteries in electric vehicles, energy storage power stations and other new energy technology fields. Therefore, preventing thermal runaway of lithium-ion batteries and improving the safety performance of lithium-ion batteries are urgent problems to be solved in the industry. Existing safety technologies for commercial lithium-ion batteries include safety valv...

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 Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 李腾飞李荐王利华
Owner HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST