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

Manufacturing method for positive pole of lithium ionic cell

A lithium-ion battery and a manufacturing method technology are applied in the field of manufacturing a positive electrode of a lithium-ion battery, which can solve problems such as capacity and cycle performance of a battery that is easy to curl, and achieve the effects of reducing curling, reducing curling, and reducing surface tension.

Active Publication Date: 2009-04-29
BYD CO LTD
View PDF1 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing lithium-ion battery positive electrode preparation method that it is easy to curl and the capacity and cycle performance of the battery are poor, and to provide a method for making the lithium-ion battery positive electrode that can reduce the curling phenomenon , the battery composed of the positive electrode prepared by this method has high capacity and good cycle performance

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The water-based positive electrode slurry can be prepared by conventional preparation methods, for example, uniformly mixing positive electrode active materials, conductive agents, water-soluble binders, thickeners and water.

[0020] The positive electrode active material can be a conventional positive electrode active material for lithium-ion batteries, for example, it can be LiCoO 2 、LiFePO 4 , LiNiCoAlO 2 and LiNiMnCoO 2 one or more of them.

[0021] The conductive agent can be a conventional conductive agent used in lithium-ion batteries, for example, it can be one or more of carbon black, acetylene black, carbon fiber, graphite and artificial graphite.

[0022] The water-soluble binder can be a conventional water-soluble binder for lithium ion batteries, for example, it can be styrene-butadiene rubber (SBR), polytetrafluoroethylene (PTFE), silane coupling agent and titanate One or more of the coupling agents.

[0023] The thickener can be a conventional thick...

Embodiment 1

[0030] This example illustrates the preparation method of the positive electrode of the lithium ion battery provided by the present invention.

[0031] (1) Preparation of slurry.

[0032] Make the tackifier CMC into a 4% by weight aqueous solution, stir and mix with the conductive agent acetylene black for 1 hour, then add the positive electrode active material LiFePO 4 Fully mixed, stirred for 3 hours, then added 40% by weight of SBR aqueous solution, fully stirred for 1 hour, and finally added 20% by weight of ethylene glycol ether aqueous solution and stirred for 30 minutes to obtain a water-based positive electrode slurry. Its composition is LiFePO 4 : Acetylene black: CMC: SBR: Ethylene glycol ether: water = 100:5:1:2:20:127 (weight ratio).

[0033] (2) Slurry coating.

[0034] The prepared slurry was uniformly coated on an aluminum foil with a thickness of 12 microns.

[0035] (3) The pole piece is dried and rolled.

[0036] Enter the oven, set the temperature in th...

Embodiment 2

[0038] This example illustrates the preparation method of the positive electrode of the lithium ion battery provided by the present invention.

[0039] The positive electrode sheet A2 was prepared according to the same method as in Example 1, except that the water-based positive electrode slurry did not contain ethylene glycol ether, and the composition of the water-based positive electrode slurry was LiFePO 4 : Acetylene black: CMC: SBR: water = 100:5:1:2:60 (weight ratio).

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
lengthaaaaaaaaaa
widthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing a lithium ion battery anode. The preparation method includes that aqueous anode slurry is coated on a positive current collector and then dried. The drying process includes three stages. The temperature of the first and third drying stages is lower than that of the second drying stage. The method for preparing the lithium ion battery anode reduces the phenomenon of curling during the drying process. The flexibility and the adhesion of the prepared anode plate are strengthened without material dropping or damage, thus the capacity and the circulation performance of the battery consisting of the anode prepared with the method are improved.

Description

technical field [0001] The invention relates to a method for making a positive electrode of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of small size, high energy, and no pollution, and have been more and more widely used in portable electronic products such as mobile phones and digital cameras. [0003] In the production and manufacture of lithium-ion batteries, electrodes are usually formed by mixing positive or negative active materials, conductive agents, and binders in a liquid medium to obtain a slurry, and then coating the slurry on the current collector, heating The liquid medium is removed by evaporation. [0004] At present, for the production of positive electrodes, organic system pulping is usually used, that is, polyvinylidene fluoride (PVDF) is used as a binder, and strong polar organic compounds such as N-dimethylpyrrolidone (NMP) and dimethyl formazan are used. Amide (DMF) or dimethyl sulfoxide (DMSO) was u...

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): H01M4/04H01M4/48H01M4/58H01M4/62
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 王炜娜张天赐
Owner BYD 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