Supercharge Your Innovation With Domain-Expert AI Agents!

Preparation method of lithium iron phosphate material and lithium ion battery

A technology of lithium iron phosphate and iron phosphate, which is applied in the field of preparation of lithium iron phosphate materials, can solve the problems of low cycle efficiency, low capacity of lithium iron phosphate, easy agglomeration of impurity raw materials, etc., and achieve high specific capacity, good capacity retention rate, The effect of small particles

Inactive Publication Date: 2012-11-28
BYD CO LTD
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems that the existing preparation method of lithium iron phosphate material is easy to introduce impurities and the raw materials are easy to agglomerate, so that the prepared lithium iron phosphate has low capacity and low cycle efficiency

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

[0021] Accordingly, the invention provides a method for preparing lithium iron phosphate material, comprising the steps of:

[0022] Step 1. Prepare alcohol solution of lithium source: disperse iron phosphate in alcohol solution to obtain iron phosphate dispersion; in this step, add iron phosphate to alcohol solution, and then use a dispersing machine, for example: Fluko The dispersing machine disperses strongly to obtain a dispersion of iron phosphate. In the dispersion of iron phosphate, the concentration of iron phosphate is 1~5mol / L; wherein, the iron phosphate is nano iron phosphate with a particle size of 50-500nm In the present invention, adopting single ferric phosphate to replace phosphorus source, iron source to prepare lithium iron phosphate material, can avoid the generation of more side reactions, because the kind of raw material is more, the side reaction in the middle may increase, to the generation The final lithium iron phosphate material is unfavorable; and i...

Embodiment 1

[0034] 1) Prepare the alcohol solution of the lithium source: weigh 2 mol of lithium acetate, dilute it to 2L with absolute ethanol, stir and dissolve it thoroughly, and obtain the alcohol solution of the lithium source, which is designated as liquid A;

[0035] 2) Preparation of ferric phosphate dispersion: Weigh 2 mol of nanometer ferric phosphate, dilute to 1 L with absolute ethanol, and disperse for 20 minutes with a Fluko high-speed shear disperser to obtain a ferric phosphate dispersion, which is designated as liquid B;

[0036] 3) Add liquid B to the magnetically driven high-pressure reactor, then slowly add liquid A to liquid B, control the flow rate of liquid A to 100ml / min, and then add 1.2mol of pure water; after completion, use absolute ethanol The volume of the above mixed liquid was fixed to 5L; then CO gas was introduced immediately, and the flow rate was controlled at 100L / h. After 20 minutes, the reaction kettle was sealed, and the temperature was raised to 180...

Embodiment 2

[0039] 1) Prepare the alcohol solution of the lithium source: weigh 2 mol of lithium acetate, dilute it to 2L with absolute ethanol, stir and dissolve it thoroughly, and obtain the alcohol solution of the lithium source, which is designated as liquid A;

[0040] 2) Preparation of iron phosphate dispersion: Weigh 2 mol of nano-iron phosphate and 2 mol of ascorbic acid, dilute to 1 L with absolute ethanol, and disperse for 20 minutes with a Fluko high-speed shearing disperser to obtain a dispersion of iron phosphate, which is designated as liquid B ;

[0041] 3) Add liquid B to the magnetic drive high-pressure reactor, then slowly add liquid A to liquid B, control the flow rate of liquid A to 100ml / min, and then add 1.2mol of pure water; The above mixed solution was fixed to 5L; then nitrogen gas was introduced immediately, and the flow rate was controlled at 100L / h. After 20 minutes, the reaction kettle was sealed, and the temperature was raised to 180°C. After keeping the temp...

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
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a lithium iron phosphate material, comprising the following steps of: step 1, dispersing iron phosphate into an alcohol solution to obtain a dispersion solution of iron phosphate; step 2, dissolving a lithium source into the alcohol solution to obtain an alcohol solution of the lithium source; step 3, adding the alcohol solution of the lithium source into the dispersion solution of the iron phosphate; and reacting under a reduction gas atmosphere or adding a reducing agent to obtain the lithium iron phosphate material after the reaction. The invention further provides a lithium ion battery. The grain of the lithium iron phosphate material prepared by the preparation method disclosed by the invention is smaller; and the specific capacity of the lithium ion battery prepared from the lithium iron phosphate material is higher and the capacity keeping rate is better.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of lithium iron phosphate material. Background technique [0002] As a high-energy chemical power source, lithium-ion batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. . In recent years, LiFePO 4 It has become a research hotspot of positive electrode active materials for lithium-ion batteries. LiFePO 4 As a positive electrode active material for lithium-ion batteries, it has good electrochemical performance compared with other positive electrode active materials. The charging and discharging platform is very stable, and the structure is stable during charging and discharging. It has the advantages of being used in the environment and having a wide range of raw material sources. [0003] The existing preparation methods of lithium iron phosphate materi...

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): C01B25/45H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李阳
Owner BYD CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com