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

A kind of all-ceramic diaphragm for lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and ceramic diaphragms, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as easy shrinkage, decomposition, and affecting the thermal stability of diaphragms at high temperatures, and achieve the elimination of safety issues and good electrolyte Wettability, the effect of promoting lithium ion transport

Active Publication Date: 2021-04-20
JILIN UNIV
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymeric binder in the ceramic coating also has the defects of easy shrinkage and decomposition at high temperature, which becomes an unfavorable factor affecting the thermal stability of the separator

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 kind of all-ceramic diaphragm for lithium ion battery and preparation method thereof
  • A kind of all-ceramic diaphragm for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Diatomaceous earth, lithium carbonate, titanium dioxide, polyvinylidene fluoride (PVDF), and N-methylpyrrolidone (NMP) are mixed uniformly at a certain mass ratio of 40:55:0.2:0.8:4, molded, and dried at 75°C; The dried molded sample was placed in a muffle furnace and calcined to 810° C., the heating rate was 6° C. / min, and the temperature was maintained for 10 hours; the calcined sample was surface polished to obtain the all-ceramic separator for lithium-ion batteries.

[0014] The all-ceramic diaphragm for lithium-ion batteries has a porosity of 56.3%, a liquid absorption rate of 193%, and a discharge specific capacity of 91.8mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

Embodiment 2

[0016] Diatomaceous earth, lithium carbonate, titanium dioxide, polyvinylidene fluoride (PVDF), and N-methylpyrrolidone (NMP) are mixed uniformly at a certain mass ratio of 50:45:0.4:0.6:4, molded, and dried at 75°C; The dried molded sample was placed in a muffle furnace and calcined to 830° C., the heating rate was 5° C. / min, and the temperature was maintained for 9 hours; the calcined sample was surface polished to obtain the all-ceramic separator for lithium-ion batteries.

[0017] The all-ceramic separator for lithium-ion batteries has a porosity of 57.9%, a liquid absorption rate of 202%, and a discharge specific capacity of 92.1mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

Embodiment 3

[0019] Diatomaceous earth, lithium carbonate, titanium dioxide, polyvinylidene fluoride (PVDF), N,N-dimethylformamide (DMF) are mixed uniformly at a certain mass ratio of 55:40:0.5:0.5:4, molded, 75°C Drying; the dried molded sample was placed in a muffle furnace and calcined to 840°C, the heating rate was 4°C / min, and kept for 8 hours; the calcined sample was surface polished to obtain the all-ceramic separator for lithium ion batteries.

[0020] The all-ceramic separator for lithium-ion batteries has a porosity of 52.4%, a liquid absorption rate of 183%, and a discharge specific capacity of 89.8mAh g at a rate of 10C. -1 (lithium iron phosphate battery system).

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
thermal stabilityaaaaaaaaaa
porosityaaaaaaaaaa
porosityaaaaaaaaaa
Login to View More

Abstract

The invention relates to an all-ceramic diaphragm for a lithium ion battery and a preparation method thereof, belonging to the field of diaphragm materials. The method uses the natural porous mineral diatomite as the main raw material, adds lithium carbonate and a small amount of titanium dioxide, and uses a small amount of binder. After molding, it is calcined at a high temperature to obtain a lithium-ion battery with titanium-doped lithium silicate as the main component. Full ceramic diaphragm. The thermal stability temperature of the all-ceramic separator exceeds 800°C, which can effectively avoid the internal short-circuit fire of the battery caused by the thermal shrinkage and deformation of the traditional lithium-ion battery, and significantly improve the safety of the lithium-ion battery. The all-ceramic diaphragm has high porosity and high liquid absorption rate, and the titanium-doped lithium silicate component in the diaphragm can promote the dissociation of lithium salt in the electrolyte of lithium-ion batteries, promote the transmission of lithium ions, and improve the performance of batteries in high-current charging and discharging. and long-term capacity retention.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and relates to a high-temperature-resistant, power-type lithium-ion battery diaphragm suitable for high-current charging and discharging and a preparation method thereof. Background technique: [0002] The wide application of lithium-ion batteries has promoted the development of electric vehicles, and the separator, which is the core component of the battery, is ushering in a new round of development peak. The diaphragm used in the power lithium-ion battery is obviously different from the ordinary lithium-ion battery diaphragm. The former provides power for vehicles such as vehicles and needs to provide higher voltage, greater power and more electricity. Therefore, the diaphragm is proposed higher requirements. At present, commercial lithium-ion battery separator materials are mainly porous polyolefins such as polyethylene (PE), polypropylene / polyethylene (PP / PE) films, et...

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): H01M50/403H01M50/434H01M50/489H01M50/491H01M10/0525
CPCH01M10/0525H01M50/431H01M50/403Y02E60/10
Inventor 薛兵杨阔李冬妮李晔李芳菲雒锋
Owner JILIN UNIV