Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of composite crystal type bismuth iron phosphate lithium battery cathode material and preparation method thereof

A technology of lithium bismuth iron phosphate and battery positive electrode, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low product density, difficulty and high manufacturing cost.

Active Publication Date: 2016-02-03
CNGR ADVANCED MATERIAL CO LTD
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the existence of Li iron phosphate as the positive electrode material of lithium ion battery + The intercalation and de-intercalation process of LiFePO4 is limited to two-dimensional mobile space, and the structural defects of too long mobile channel, as well as the existence of long high-temperature calcination cycle, low product density, and Fe in the synthesis of lithium iron phosphate. 2+ easily oxidized to Fe 3+ , It is not easy to obtain single-phase LiFePO 4 , low purity, high manufacturing cost and other defects

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
  • A kind of composite crystal type bismuth iron phosphate lithium battery cathode material and preparation method thereof
  • A kind of composite crystal type bismuth iron phosphate lithium battery cathode material and preparation method thereof
  • A kind of composite crystal type bismuth iron phosphate lithium battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Mix dilithium hydrogen phosphate, iron oxide, bismuth nitrate, and phosphoric acid in a high-speed mixer according to the effective element molar ratio Li:Fe:Bi:P=0.8:0.9:0.15:1, and add 10% of the mass of Tian Qing glue, add the crystal complex agent triethanolamine of total mass 0.2% simultaneously, and high-speed stirring disperses with the speed of 500rpm 30min to obtain pasty colloid pre-reaction body;

[0036] 2) Pump the pasty colloid pre-reaction body obtained in step 1) into a conical screw extruder. The screw extruder is composed of conveying thread elements, engaging thread elements, and compression thread elements arranged on the mandrel in a building block. Conveying drying section, shearing homogenization section, and compression sintering section. Control the screw temperature: conveying drying section 160°C, shearing homogenization section 200°C, compression sintering section 300°C, and the screw produces continuous shear under the condition of 200rpm ...

Embodiment 2

[0041] 1) Mix lithium carbonate, ferric chloride, bismuth nitrate, and diammonium hydrogen phosphate in a high-speed mixer according to the effective element molar ratio Li:Fe:Bi:P=0.8:0.8:0.3:1, and add 15% of the total mass % carboxymethyl starch glue, add the 0.5% crystal formation complex agent triethanolamine of total mass simultaneously, and obtain the pasty colloid pre-reaction body with the high-speed stirring dispersion 10min of the speed of 1000rpm;

[0042] 2) Pump the pasty pre-reaction body obtained in step 1) into a conical screw extruder. The screw extruder is composed of conveying thread elements, meshing thread elements, and compression thread elements arranged on the mandrel in a building block to form a conveying There are three parts: drying section, shearing homogenization section, and compression sintering section. Control the screw temperature: conveying drying section 120°C, shearing homogenization section 180°C, compression sintering section 300°C, and th...

Embodiment 3

[0047] 1) In a high-speed mixer, mix lithium dihydrogen phosphate, iron nitrate, bismuth nitrate, and ammonium dihydrogen phosphate according to the effective element molar ratio Li:Fe:Bi:P=0.8:0.8:0.2:1, and add the total mass of 20% guar gum, while adding 1% crystal complex agent triethanolamine of the total mass, and stirring and dispersing at a high speed of 800rpm for 20min to obtain a paste colloid pre-reaction body;

[0048] 2) Pump the pasty pre-reaction body obtained in step 1) into the screw extruder, and the screw extruder consists of conveying thread elements, meshing thread elements, and compression thread elements arranged on the mandrel in a building block form to form a conveying drying section 1, shear homogenization section, compression sintering section, control screw temperature: conveying drying section 150°C, shear homogenization section 200°C, compression sintering section 360°C, the screw produces continuous shear homogenization under the rotation condit...

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
thicknessaaaaaaaaaa
densityaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a composite crystal type bismuth iron phosphate lithium battery cathode material, which is composed of olivine type lithium iron phosphate (LiFePO4) and bismuth oxide (δ-Bi2O3) with a fluorite structure. Migrated compound crystal structure, its composition is: Li0.8-0.9Fe0.8-0.9Bi0.1-0.3PO4. Further provide a preparation method of complex crystal lithium iron bismuth phosphate, which is characterized in that the prefabricated paste colloid is subjected to high shear, high pressure, and closed continuous reaction of a conical screw extruder to complete dispersion and induce complex crystallization in one step , Compression and sintering, so as to obtain a complete, uniform and high-density lithium-ion battery cathode material. The preparation cycle is greatly shortened by compression sintering, which makes the preparation of lithium battery cathode materials more environmentally friendly and energy-saving.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a composite crystal type lithium iron bismuth phosphate battery cathode material and a preparation method thereof. Background technique [0002] According to the oil consumption and air pollution of the automobile industry, electric vehicles have become the only way to alleviate oil consumption and solve environmental pollution. The core of the development of electric vehicles is safe and efficient energy storage secondary batteries. At present, the lead-acid and nickel-metal hydride batteries mainly used in electric vehicles or hybrid electric vehicles are gradually replaced by safe and efficient lithium batteries due to their short service life and easy pollution of the environment. Lithium-ion battery is a new type of secondary energy storage battery developed in the 1990s. Due to the advantages of high energy, long life, low consumption, no pollution, no memory effect, smal...

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 Patents(China)
IPC IPC(8): H01M4/36H01M4/58C01B25/45
CPCC01B25/45H01M4/364H01M4/5825H01M10/0525Y02E60/10
Inventor 陈庆曾军堂
Owner CNGR ADVANCED MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com