Lithium ferric phosphate battery adopting compound conductive agent and manufacturing method thereof

A lithium iron phosphate battery and composite conductive agent technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of conductive polymer volume shrinkage, reduced conductivity efficiency, and high production costs, and achieve improved conductivity stability Performance, capacity and ratio increase, and the effect of reducing harsh requirements

Inactive Publication Date: 2012-09-19
ZHEJIANG ZHENLONG BATTERY
View PDF3 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the lithium iron phosphate power battery has many of the above advantages, it also has certain disadvantages: the electrical conductivity of the material is very low, which is not conducive to reversible reactions, especially for high-rate discharges.
Although this method can improve the conductivity of the electrode to a certain extent, it is easy to cause surface passivation when the carbon nanotubes are exposed in the air, resulting in a significant drop in conductivity; and, in order to ensure the conductivity of the pole piece, carbon nanotubes The length-to-diameter ratio requirements of the

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 ferric phosphate battery adopting compound conductive agent and manufacturing method thereof
  • Lithium ferric phosphate battery adopting compound conductive agent and manufacturing method thereof
  • Lithium ferric phosphate battery adopting compound conductive agent and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 3 parts of the positive electrode binder polyvinylidene fluoride PVDF into 30 parts of 100% N-methylpyrrolidone and stir to prepare the positive electrode gel. Add 1 part of carbon nanotubes / polypyrrole to the positive electrode gel for dispersion, and finally add 96 parts The positive electrode active material LiFePO 4 Stirring is carried out to prepare positive electrode slurry. The positive electrode slurry is uniformly coated on both sides of the aluminum foil, and after drying, the positive electrode sheet is obtained by rolling and cutting. Mix 97 parts of graphite, 0.5 parts of carbon nanotubes / polypyrrole, 16.7 parts of water-based binder LA132 (the water-based binder LA132 is a solution, and the solute content is 15%), and 145.5 parts of deionized water are evenly mixed to make negative electrode slurry , evenly coated on both sides of the copper foil, after drying, rolling and slitting to obtain the negative electrode sheet. Using the winding method...

Embodiment 2

[0025] Dissolve 2.3 parts of the positive electrode binder polyvinylidene fluoride PVDF into 23 parts of 100% N-methylpyrrolidone and stir to prepare the positive electrode gel. Add 0.7 parts of carbon nanotubes / polypyrrole to the positive electrode gel for dispersion, and finally add 97 parts of positive active material LiFePO 4 Stirring is carried out to prepare positive electrode slurry. The slurry is evenly coated on both sides of the aluminum foil, and after drying, the positive electrode sheet is obtained by rolling and cutting. Mix 97 parts of graphite, 0.5 parts of carbon nanotubes / polypyrrole, 16.7 parts of water-based binder LA132 (the water-based binder LA132 is a solution with a solute content of 15%), and 145.5 parts of deionized water to make a negative electrode The slurry is evenly coated on both sides of the copper foil, and after drying, the negative electrode sheet is obtained by rolling and cutting. Using the winding method, place the negative electrode s...

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
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a manufacturing method for a lithium ferric phosphate battery adopting a compound conductive agent. The manufacturing method comprises the following steps of: dissolving anode binder polyvinylidene fluoride in N-methyl pyrrolidone and stirring, thereby obtaining anode glue; adding a carbon nano-tube/conductive polymer compound material into the anode glue and scattering; adding anode active matter LiFePO4 and stirring, thereby obtaining anode slurry; uniformly coating the anode slurry on two surfaces of an aluminum foil, drying, and then rolling and slicing, thereby obtaining anode plates; uniformly mixing cathode active matter graphite, the carbon nano-tube/conductive polymer compound material, a cathode binder and de-ionized water, thereby obtaining cathode slurry; uniformly coating the cathode slurry on two surfaces of a copper foil, drying, and then rolling and slicing, thereby obtaining cathode slices; coiling, flatly pressing and banding, and then drying for 8 hours in vacuum at 65 DEG C; filling electrolyte into a dried battery; and forming an end product of the lithium ferric phosphate battery after filling the electrolyte. According to the manufacturing method provided by the invention, the capacity, multiplying power, circulation and safety property of the battery are greatly improved.

Description

【Technical field】 [0001] The invention relates to the field of lithium ion battery and its manufacturing process, in particular to the application of a new composite material in the manufacturing process of iron phosphate lithium ion battery. 【Background technique】 [0002] As a new generation of high-energy secondary battery products, lithium-ion batteries have outstanding characteristics such as high discharge voltage, high specific energy and specific power, small self-discharge, and long cycle life. They have been widely used in mobile communication equipment, notebook computers, instruments and meters, etc. In addition, domestic and foreign are also competing to develop the application of lithium-ion batteries in electric vehicles, aerospace and energy storage. The choice of positive electrode material greatly affects the performance of lithium batteries: the currently commercialized positive electrode materials are: LiCoO 2 , LiMn 2 o 4 , Li[Ni 1 / 3 co 1 / 3 mn 1 / 3 ...

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): H01M4/62H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 杨兰生李艳陈威何华金菊凤
Owner ZHEJIANG ZHENLONG BATTERY
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