Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A positive electrode and its preparation method and a battery with the positive electrode

A positive electrode and positive electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of reducing battery energy density, battery temperature rise, battery failure, etc., to achieve the effect of increasing energy density, shortening cycle time, and improving conductivity

Active Publication Date: 2022-07-12
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional lithium-ion battery electrode is to stir and mix the active material, conductive agent, binder and additive in the solvent, and then coat it on the current collector, and then roll it with the solvent completely volatilized to obtain an electrode with uniform thickness. The conductive agent, binder and current collector undoubtedly have a certain quality, and due to the bonding performance of the binder and the factors of charge transport, there is a certain limit to the thickness of the electrode coated on the current collector, which obviously reduces the The energy density of the battery, in addition, when the battery encounters acupuncture and extrusion, the current collector is pierced, and the burrs generated make the positive current collector contact with the negative electrode, a short circuit occurs, and the battery temperature rises sharply, resulting in battery failure

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 positive electrode and its preparation method and a battery with the positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A filter paper sheet with a thickness of 0.02 mm was soaked in a 1 mol / L n-butyl titanate solution for 0.5 hours, taken out and dried in an oven at 60 °C, and the lithium cobalt oxide material was mixed with deionized water for ultrasonic dispersion to obtain solubility. It is 20g / L lithium cobalt oxide dispersion, and then the dried filter paper is mixed with the dispersion for full hydrolysis reaction, taken out and dried in an oven at 80 °C to obtain the hydrolyzed titanium dioxide and lithium cobalt oxide supported on the filter paper Then, the composite was heated to 600 °C under nitrogen atmosphere for carbonization treatment for 10 h to obtain a carbon fiber network structure supported by nano titanium dioxide and lithium cobalt oxide, which is the positive electrode.

[0026] The obtained positive electrode film was cut into a certain size, and the graphite negative electrode, PE separator and carbonate electrolyte were prepared into a soft-packed battery cell, w...

Embodiment 2

[0028] A filter paper sheet with a thickness of 0.05 mm was soaked in a 1 mol / L n-butyl titanate solution for 1 hour, taken out and dried in an oven at 80 °C, and the lithium iron phosphate material was mixed with deionized water for ultrasonic dispersion to obtain the solubility. It is a 100g / L lithium iron phosphate dispersion, and then the dried filter paper is mixed with the dispersion to conduct a sufficient hydrolysis reaction, taken out and dried in an oven at 100 ° C to obtain the hydrolyzed titanium dioxide and lithium iron phosphate. Loaded on the filter paper Then, the composite was heated to 1000 °C under nitrogen atmosphere for carbonization treatment for 2 h to obtain a carbon fiber network structure supported by nano-titanium dioxide and lithium iron phosphate, which is the positive electrode.

[0029] The obtained positive electrode film was cut into a certain size, and the graphite negative electrode, PE separator and carbonate electrolyte were prepared into a ...

Embodiment 3

[0031] A filter paper sheet with a thickness of 0.1 mm was soaked in a 1 mol / L n-butyl titanate solution for 2 hours, taken out and dried in an oven at 100 °C, and the nickel cobalt lithium manganate NCM523 material was mixed with deionized water for ultrasonic dispersion. The nickel-cobalt-manganese NCM523 dispersion with a solubility of 200 g / L was obtained, and then the dried filter paper was mixed with the dispersion to carry out a sufficient hydrolysis reaction, and then dried in an oven at 60 °C to obtain hydrolyzed titanium dioxide and nickel-cobalt-manganese. The composite of lithium oxide NCM523 loaded on filter paper, and then heated to 800 ℃ under nitrogen atmosphere for carbonization treatment for 6 h, to obtain the carbon fiber network structure supported by nano titanium dioxide and lithium nickel cobalt manganate NCM523, which is the positive electrode.

[0032] The obtained positive electrode film was cut into a certain size, and the graphite negative electrode,...

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
Login to View More

Abstract

The present invention provides a positive electrode, a preparation method thereof, and a battery having the positive electrode. The positive electrode is a carbon fiber network structure supported by a positive electrode material and nano-titania. The positive electrode is prepared as follows: a paper sheet is soaked in a titanate solution, and then taken out. Dry to obtain a composite paper sheet, ultrasonically disperse the positive electrode material and deionized water according to a certain proportion to obtain a dispersion liquid with a certain solubility, then mix the composite paper sheet with the dispersion liquid for hydrolysis reaction, take out and dry, and obtain titanium dioxide and The composite body supported by the positive electrode material; and then the composite body is heated at high temperature in a protective gas atmosphere to obtain a structure in which nano titanium dioxide and positive electrode material are supported on a carbon fiber network, that is, a positive electrode, and a battery with the positive electrode. The technical scheme of the invention is used to prepare a self-supporting flexible positive electrode without binder and current collector, which can simplify the electrode preparation process, reduce the process, reduce the cost, improve the energy density, improve the conductivity and safety.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode and a preparation method thereof and a battery with the positive electrode, which is a self-supporting flexible electrode that does not depend on a current collector. Background technique [0002] Lithium-ion battery is a new type of high-energy battery successfully developed in the 20th century. It can be understood as a battery containing lithium elements, including metal lithium, lithium alloy, lithium ion, and lithium polymer, because of its high specific energy, high battery voltage, and operating temperature range. Wide, long storage life and other advantages, are widely used in digital products, small electrical appliances, electric bicycles and other fields. With the rapid development of the new energy vehicle industry, low cost, high energy density, long cruising range, and high safety have become the most concerned focus at present, an...

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): H01M4/04H01M4/13H01M4/139H01M10/0525
CPCY02P70/50
Inventor 李强段继祥杨从强张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com