Lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of brittle separators, complicated procedures, and complicated processes, so as to inhibit damage and improve safety performance Effect

Inactive Publication Date: 2010-05-26
DONGGUAN NEWPOWER ELECTRIC SCI & TECH
View PDF2 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of treating the separator in the above method is complicated, the thickness of the oxide layer is only 0.1-100nm, and the bonding performance between the oxide and the polymer material of the separator is not good, the separator is easy to be brittle, and the safety of the lithium-ion secondary battery poor performance
[0006] As another example, the US patent ap

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
  • Lithium-ion secondary battery
  • Lithium-ion secondary battery
  • Lithium-ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1:

[0035] The preparation of the positive electrode plate: Lithium cobalt oxide (LiCoO 2 ), conductive carbon black (Super-P), polyvinylidene fluoride (PVDF) are mixed with N,N-dimethylpyrrolidone (NMP) at a weight ratio of 93:3:4, and stir to obtain a slurry for coating the positive electrode sheet. During the stirring process, the viscosity can be adjusted by NMP; then, the slurry for coating the positive electrode sheet is uniformly coated on both sides of the 12μm-thick positive current collector (aluminum foil) according to a certain width, and at the same time, a positive electrode sheet coated on only one side is made ; Finally, after cold pressing, slicing (that is, the pole piece is cut, cut into the required size) to make the positive electrode sheet.

[0036] Preparation of oxide layer: SiO with a particle size of 20nm 2 Disperse in acetone, add vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) as a binder, disperse it in a stirring tank, and ...

Example Embodiment

[0040] Example 2:

[0041] The preparation of the positive electrode plate: the lithium cobalt nickel manganese oxide (LiNiCoMnO 2 ), conductive carbon black (Super-P), polyvinylidene fluoride (PVDF) and N,N-dimethylpyrrolidone (NMP) at a weight ratio of 95:2:3 are mixed, and stirred to obtain a slurry for coating the positive electrode sheet The viscosity can be adjusted by NMP during the stirring process; then, the slurry for coating the positive electrode sheet is uniformly coated on both sides of the 12μm-thick positive current collector (aluminum foil) according to a certain width, and at the same time, a positive electrode sheet coated on only one side is made; Finally, through cold pressing and slicing (that is, the pole piece is cut and cut into the required size) to prepare the positive electrode sheet.

[0042] Preparation of the oxide layer: the Al with a particle size of about 1μm 2 O 3 Disperse in acetone, add SBR as a binder, disperse uniformly in a stirring tank, and...

Example Embodiment

[0046] Example 3:

[0047] The preparation of the positive electrode plate: the lithium cobalt nickel manganese oxide (LiNiCoMnO 2 ), conductive carbon black (Super-P), polyvinylidene fluoride (PVDF) and N,N-dimethylpyrrolidone (NMP) at a weight ratio of 95:2:3 are mixed, and stirred to obtain a slurry for coating the positive electrode sheet The viscosity can be adjusted by NMP during the stirring process; then, the slurry for coating the positive electrode sheet is uniformly coated on both sides of the 12μm-thick positive current collector (aluminum foil) according to a certain width, and at the same time, a positive electrode sheet coated on only one side is made; Finally, through cold pressing and slicing (that is, the pole piece is cut and cut into the required size) to prepare the positive electrode sheet.

[0048] Preparation of oxide layer: Sb with a particle diameter of 200nm 2 O 5 Disperse in water, add acrylic acid (PAA) as a binder, disperse uniformly through a stirring...

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
Particle sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a lithium-ion secondary battery, which comprises a positive plate, a negative plate, an isolation membrane arranged between the positive plate and the negative plate, and electrolyte; the positive plate comprises a positive pole current collector and a positive pole active material distributed on the positive pole current collector; the negative plate comprises a negative pole current collector and a negative pole active material which is distributed on the negative pole current collector; and an insulating oxide layer is distributed on the surface of the positive plate. In the invention, the insulating oxide layer in the lithium-ion secondary battery can prevent the positive pole current collector from contacting the isolation membrane directly, absorb the HF in the electrolyte and inhibit the HF from damaging the positive pole and the negative pole, thereby effectively improving the safety property of the lithium-ion secondary battery.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a lithium ion secondary battery with good safety performance. Background technique [0002] With the development of modern society and science and technology, mobile devices such as video cameras, notebook computers, mobile DVDs and digital cameras are more and more widely used, and the demand for high-energy batteries is also increasing. As a green high-energy battery, lithium-ion secondary batteries are widely used in various mobile devices due to their advantages of high voltage, high energy density, and light weight. [0003] Lithium-ion secondary batteries generally include: a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive and negative electrode sheets, and an electrolyte. The positive electrode sheet includes a positive electrode collector and a positive active material distributed on the positive electrode collector. The nega...

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
IPC IPC(8): H01M10/0525H01M4/13
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 涂健张小细赵新生王岳利张介威吴凯
Owner DONGGUAN NEWPOWER ELECTRIC SCI & 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