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

Preparation method and application of positive electrode material with high-conductivity tubular network structure

A technology of network structure and positive electrode material, applied in the direction of positive electrode, battery electrode, structural parts, etc., can solve the problem of easy agglomeration, and achieve the effect of high conductivity, simple operation and speeding up the diffusion rate.

Active Publication Date: 2020-04-28
SHANDONG GOLDENCELL ELECTRONICS TECH
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CNTs have excellent electrical conductivity, the strong van der Waals force of CNTs makes the surface inert and easy to agglomerate during processing. Therefore, it is necessary to optimize the processing of CNTs.

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
  • Preparation method and application of positive electrode material with high-conductivity tubular network structure
  • Preparation method and application of positive electrode material with high-conductivity tubular network structure
  • Preparation method and application of positive electrode material with high-conductivity tubular network structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example is a specific example of preparing a positive electrode slurry with a highly conductive tubular network structure for a 3400mAh lithium iron phosphate battery.

[0035] First, take 125-135kg of lithium iron phosphate material and premix 3-5kg of PVDF, the premixing speed is 15-25rpm, the premixing time is 25-35min, and the stirring blade is reversed during premixing; after the solid powder is added , the agitator is rotating forward; then, transfer the premixed material to the mixer for primary dispersion, and disperse at a dispersion speed of 1600-1800rpm for 180-200min; finally, add 17-19kg of carbon nano conductive paste to the mixer for secondary dispersion , dispersed at a dispersion speed of 2000-2200rpm for 180-200min, adding CNTs in the secondary dispersion process, so that the CNTs are uniformly dispersed under high shear force, and finally a 3400mAh lithium iron phosphate battery positive electrode slurry with a highly conductive tubular network st...

Embodiment 2

[0040] This example is a specific example of preparing a positive electrode slurry with a highly conductive tubular network structure for a 3600mAh lithium iron phosphate battery.

[0041] First, take 130-140kg of lithium iron phosphate material and premix 3-5kg of PVDF, the premixing speed is 15-25rpm, the premixing time is 25-35min, and the stirring blade is reversed during premixing; after the solid powder is added , the agitator is rotating forward; then, transfer the premixed material to the mixer for primary dispersion, and disperse at a dispersion speed of 1600-1800rpm for 180-200min; finally, add 17-19kg of carbon nano conductive paste to the mixer for secondary dispersion , disperse at a dispersion speed of 2000-2200rpm for 180-200min, add CNTs in the secondary dispersion process, so that the CNTs are uniformly dispersed under high shear force, and finally a 3600mAh lithium iron phosphate battery positive electrode slurry with a highly conductive tubular network struct...

Embodiment 3

[0044] This example is a specific example of preparing a positive electrode slurry with a highly conductive tubular network structure for a 3800mAh lithium iron phosphate battery.

[0045] First, take 135-145kg of lithium iron phosphate material and premix 8-10kg of PVDF, the premixing speed is 15-25rpm, the premixing time is 25-35min, and the stirring blade is reversed during premixing; after the solid powder is added , the agitator is rotating forward; then, transfer the premixed material to the mixer for primary dispersion, and disperse at a dispersion speed of 1600-1800rpm for 180-200min; finally, add 18-20kg carbon nano conductive paste to the mixer for secondary dispersion , dispersed at a dispersion speed of 2000-2200rpm for 180-200min, adding CNTs during the secondary dispersion process, so that the CNTs were uniformly dispersed under high shear force, and finally a 3800mAh lithium iron phosphate battery positive electrode slurry with a highly conductive tubular network...

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

No PUM Login to View More

Abstract

The invention relates to the technical field of chemical power supplies. The invention provides a preparation method and application of a positive electrode material with a high-conductivity tubular network structure. The preparation method comprises the following steps: (1) premixing PVDF and a lithium iron phosphate material; (2) dispersing the premixed material at a high speed; and (3) adding carbon nanotube conductive paste (CNTs) into the premixed material, so that the CNTs form a uniform and stable positive electrode material with a tubular network structure under the effect of high shear. The positive electrode material with the tubular network structure is composed of multi-walled carbon nanotubes and a lithium iron phosphate material, and the carbon nanotubes are uniformly dispersed on the surface of lithium iron phosphate to form a complete three-dimensional conductive network. The prepared positive electrode material with the conductive network structure can improve the diffusion rate of lithium ions in the positive electrode material, realizes excellent electrochemical performance, has relatively high conductivity, specific capacity and rate capability, and can be applied to the application fields of lithium batteries, capacitors, electro-catalysis and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and relates to a preparation method and application of a highly conductive tubular network structure positive electrode material. Background technique [0002] With the rapid development of the new energy industry, lithium-ion batteries have attracted widespread attention due to their environmental friendliness, low cost and good thermal stability. At present, lithium-ion batteries cannot meet the market's needs for new batteries such as high specific energy and high specific power due to insufficient energy density, low power density, and low charge and discharge rate. The main reason for the above shortcomings of lithium-ion batteries is the slow electrochemical reaction kinetics caused by the poor conductivity of the active material in the positive electrode material. by the formula (C is the battery discharge capacity; L is the thickness of the electrode; ξ is the volume fra...

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): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525H01G11/26H01G11/30B01J27/185B01J35/12B01J35/27
CPCH01M4/362H01M4/5825H01M4/583H01M4/625H01M10/0525H01G11/30H01G11/26B01J27/1853H01M2004/028H01M2004/021B01J35/33B01J35/27Y02E60/13Y02E60/10
Inventor 陈萌周会李涛王勇
Owner SHANDONG GOLDENCELL ELECTRONICS TECH