Lithium iron phosphate positive electrode material, preparation method thereof, and lithium ion battery

A lithium-ion battery, lithium iron phosphate technology, applied in the field of lithium-ion batteries, can solve problems such as low compaction density, and achieve the effects of improving electrical conductivity, material uniformity, and energy density

Active Publication Date: 2018-05-22
FOSHAN DYNANONIC +1
View PDF6 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a lithium iron phosphate positive electrode material with a high compacted

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 iron phosphate positive electrode material, preparation method thereof, and lithium ion battery
  • Lithium iron phosphate positive electrode material, preparation method thereof, and lithium ion battery
  • Lithium iron phosphate positive electrode material, preparation method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0056] Example 1:

[0057] A preparation method of lithium iron phosphate cathode material includes the following steps:

[0058] (1) Take 7.46 g of lithium carbonate, 81.2 g of iron nitrate, and 23.24 g of ammonium dihydrogen phosphate, and mix them uniformly to obtain a mixture;

[0059] (2) Using a nano-ceramic grinder for ceramic grinding of the above-mentioned mixture material, wherein the ceramic grinding is ground by a plane-to-grind method for 4 hours to obtain a powdery precursor with a particle size of ≤40 nm;

[0060] (3) In a nitrogen atmosphere, the above-mentioned powdery precursor is sintered; wherein, the sintering is divided into a first-stage sintering stage, a second sintering stage, and a third sintering stage; the first sintering stage is 3°C / min The heating rate is increased from room temperature to 180°C for 3 hours; the second sintering stage is increased from 180°C to 380°C at a heating rate of 10°C / min for 6 hours; the third sintering stage is heated from a h...

Example Embodiment

[0064] Example 2:

[0065] A preparation method of lithium iron phosphate cathode material includes the following steps:

[0066] (1) Lithium dihydrogen phosphate (ie phosphorus source and lithium source) and lithium acetate are mixed at a molar ratio of Li:Fe:P=1:1:1 to obtain a mixture;

[0067] (2) Using a nano-ceramic grinder for ceramic grinding of the above-mentioned mixture material, wherein the ceramic grinding is ground for 3 hours in a plane-to-grind manner to obtain a powdery precursor with a particle size of less than 50 nm;

[0068] (3) In a nitrogen atmosphere, the above-mentioned powdery precursor is sintered; wherein, the sintering is divided into a first sintering stage, a second sintering stage, and a third sintering stage; the first sintering stage is 5°C / min The heating rate was increased from room temperature to 200°C for 5 hours; the second sintering stage was increased from 200°C to 400°C at a heating rate of 20°C / min and sintered for 8 hours; The temperature w...

Example Embodiment

[0070] Example 3

[0071] A preparation method of lithium iron phosphate cathode material includes the following steps:

[0072] (1) The iron phosphate (ie iron source and phosphorus source) FePO 4 .2H 2 O and lithium hydroxide are mixed in a molar ratio of Li:Fe:P=1:1:1 to obtain a mixture;

[0073] (2) Using a nano-ceramic grinder for ceramic grinding of the above-mentioned mixture material for 4 hours, wherein the ceramic grinding is ground by a plane-to-grind method for 4 hours to obtain a powdery precursor with a particle size of ≤35nm;

[0074] (3) In a nitrogen atmosphere, the above-mentioned powdery precursor is sintered; wherein, the sintering is divided into a first-stage sintering stage, a second sintering stage and a third sintering stage; the first sintering stage is 10°C / min The heating rate was increased from room temperature to 220°C and sintered for 6 hours; the second sintering stage was increased from 220°C to 420°C at a heating rate of 25°C / min for 10 hours; The t...

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
Radial sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material comprises a lithium iron phosphate array formed by a plurality of lithium iron phosphate cylinders which are arranged in an array manner and granular lithium iron phosphate distributed in the lithium iron phosphate array, wherein a gap exists in two adjacent lithium iron phosphate cylinders in the lithium iron phosphate array, and every gap is filled with the granular lithium iron phosphate. The lithium iron phosphate positive electrode material having a specificmorphology has a high compacted density and a high lithium ion conductivity. The invention also provides a preparation method of the lithium iron phosphate positive electrode material, and a lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium iron phosphate cathode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which are increasingly playing an important role in various fields. As an important part of lithium-ion batteries, the cathode material of lithium-ion batteries determines the performance, price and development of lithium batteries. At present, the most studied cathode material is LiCoO 2 , LiNiO 2 , LiMn 2 o 4 、LiFePO 4 (lithium iron phosphate). Among them, the lithium iron phosphate cathode material concentrates LiCoO 2 , LiNiO 2 , LiMn 2 o 4 It has the advantages of high structural stability, good safety performance, moderate working voltage, good platform characteristics, and large theoretical capacity, etc., and has gradually become a hot research topic for ba...

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): H01M4/58H01M10/0525B82Y30/00B82Y40/00C01B25/45
CPCB82Y30/00B82Y40/00C01B25/45C01P2004/64C01P2006/11H01M4/5825H01M10/0525Y02E60/10
Inventor 孔令涌尚伟丽陈玲震李洁凤
Owner FOSHAN DYNANONIC
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