Industrialization production method of iron lithium phosphate material

A technology of lithium iron phosphate and its manufacturing method, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems that the carbon content is difficult to fix, cannot achieve rapid heating, etc., and achieves uniform temperature, excellent electrochemical performance, energy The effect of low consumption

Active Publication Date: 2008-05-07
南通冠东模塑股份有限公司
View PDF1 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the volume capacity of the battery, generally only about 5% carbon can be mixed in the positive electrode material lithium iron phosphate, and this small amount of carbon in the material is not enough to quickly absorb microwave radiation energy. Patent CN1775666A needs to be installed in a crucible There are more microwave auxiliary absorb

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
  • Industrialization production method of iron lithium phosphate material
  • Industrialization production method of iron lithium phosphate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] With ultrafine carbonyl iron powder, LiH 2 PO 4 As a raw material, the molar ratio of Li:Fe:P is 1:1:1, and the mass ratio of 1.5% nanometer silver powder is added simultaneously. Acetone was used as the dispersion medium, stirred and ball milled for 1 hour, and dried in vacuum. About 300kg of material is loaded into a specially designed industrial microwave oven. Seal the oven door and apply a vacuum. Turn on the microwave source. Control the temperature at 300°C for microwave pre-baking for 20 minutes. Then raise the temperature to 650° C. and microwave for 30 minutes. Turn off the microwave source to cool the material. Obtained LiFePO 4 is a pure phase (see figure 1 ), the primary particles are submicron structures (see figure 2 ). According to the power battery test, the 4C discharge capacity of this product can reach 116mAh / g.

Embodiment 2

[0024] With ultrafine reduced iron powder, LiOH, NH 4 h 2 PO 4 As a raw material, the molar ratio of Li:Fe:P is 1:1:1, and at the same time, 1% ultra-fine silver powder is added in a mass ratio, and methyl ethyl ketone is used as a dispersion medium, stirred and ball milled for 1 hour, and vacuum-dried. About 500kg of material is loaded into a specially designed industrial microwave oven. Seal the oven door and apply a vacuum. Turn on the microwave source. Control the temperature at 300° C. and microwave for 30 minutes. Then raise the temperature to 650° C. and microwave for 30 minutes. Turn off the microwave source to cool the material. LiFePO with the same morphology was obtained 4 product.

Embodiment 3

[0026] With ultrafine reduced iron powder, LiOH, NH 4 h 2 PO 4 As raw material, add TiO 2 For the dopant, the molar ratio of Li:Fe+Ti:P is 1:1:1, and at the same time, 1% ultra-fine silver powder is added, and methyl ethyl ketone is used as the dispersion medium, stirred and ball-milled for 1 hour, and vacuum-dried. About 500kg of material is loaded into a specially designed industrial microwave oven. Seal the oven door and apply a vacuum. Turn on the microwave source. Control the temperature at 350° C. and microwave for 30 minutes. Then raise the temperature to 660° C. and microwave for 30 minutes. Turn off the microwave source to cool the material. Obtain LiFePO with finer grains 4 product.

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 a microwave synthetic method in the industrial production of lithium ion battery cathode material, namely, lithium iron phosphate. The invention is characterized in that superfine iron powder is adopted as microwave absorbing medium and iron source material, radiation heating is performed by an industrial microwave oven specially designed through uniformly distributed multisource microwave, and the sintering temperature is strictly controlled through infrared temperature measurement and the microwave output power automatic control. The iron powder can quickly absorb the microwave energy to lead the solid phase reaction to rapidly occur. In the vacuum pumping or the leading-in of non oxidizing atmosphere, the microwave sintering temperature is 500 to 950 DEG C, andthe sintering time is 5 to 40 minutes. The method can greatly reduce the sintering time, simultaneously can eliminate the disadvantages that the lithium iron phosphate material is not sintered uniformly, and the local particle grows up abnormally and so on, the grain size of the primary particles of the product is submicron structure, the speak plausibly of the material is higher, and the processability and the electrochemistry performance of the material during the battery manufacturing are good.

Description

technical field [0001] The invention belongs to the preparation method of lithium ion battery cathode material in the field of materials. Background technique [0002] Lithium-ion battery cathode materials include lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), spinel lithium manganate (LiMn 2 o 4 ), ternary lithium nickel manganese cobalt oxide [Li(Ni 1-x-y mn x co y )O 2 ]. LiCoO 2 It is widely used in small lithium-ion batteries, because it uses cobalt, a strategic resource, is expensive, and overcharging is very unsafe; LiNiO 2 The stability and safety of LiMn are very poor; 2 o 4 The cycle performance is very poor, especially at high temperature; Li(Ni 1-x-y mn x co y )O 2 The material still uses cobalt, a strategic resource, and the precursor of the co-precipitation preparation material will generate a large amount of waste water. The above positive electrode materials are all layered or spinel metal oxides, which are prone to oxygen evol...

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): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 喻维杰
Owner 南通冠东模塑股份有限公司
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