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

Lithium ion battery positive electrode material and preparation method and application thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in improving electronic conductivity and poor electronic conductivity, and achieve good application prospects, high tap density, and excellent Effects of Conductivity and Electrochemical Properties

Active Publication Date: 2017-08-18
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The intrinsic electronic conductivity of lithium iron phosphate is poor, and the electronic conductivity between its particles is usually improved by coating a thin layer of conductive carbon on its surface, but it is difficult to improve the intrinsic electronic conductivity of the materials inside the particles

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 ion battery positive electrode material and preparation method and application thereof
  • Lithium ion battery positive electrode material and preparation method and application thereof
  • Lithium ion battery positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Design Li according to composition 1+x Fe 1-x PO 4 (x=0.02) to prepare Li with excess lithium and insufficient iron 1.02 Fe 0.98 PO 4 material.

[0058] Add 0.0024mol of glycine to 100ml of deionized water, add 0.0048mol of glucose after the glycine is dissolved; stir at room temperature until completely dissolved into a transparent solution; add 0.02448mol of lithium acetate and 0.024mol of phosphoric acid to the above transparent solution After stirring until it is uniform and transparent, add 0.02352mol of ferric sulfate and continue stirring for 6 hours at room temperature; stir and evaporate the mixture at a constant temperature of 80°C to obtain a precursor; preheat and decompose the precursor at 150°C for 5 hours, The preheated decomposition product is ground; the ground product is heat-treated at 750° C. under a nitrogen atmosphere for 4 hours, and cooled to obtain a lithium iron phosphate lithium ion battery cathode material.

[0059] Refined X-ray powder diffractio...

Embodiment 2

[0062] Design Li according to composition 1+x Fe 1-x PO 4 (x=0.05), prepare Li with excess lithium and insufficient iron 1.05 Fe 0.95 PO 4 material.

[0063] Add 0.0024mol of citric acid to 100ml of deionized water, add 0.0048mol of sucrose after the citric acid is dissolved; stir at room temperature until completely dissolved into a transparent solution; add 0.0126mol of lithium carbonate and 0.024mol of dihydrogen phosphate Add the above transparent solution, stir until it is uniform and transparent, then add 0.0228mol of ferric nitrate and stir at room temperature for 5 hours; the mixture is stirred and evaporated to dryness at a constant temperature of 80°C to obtain the precursor; the precursor is pretreated at 200°C After thermal decomposition for 4 hours, the preheated decomposition product is ground; the ground product is heat-treated at 650° C. under an argon atmosphere for 6 hours, and cooled to obtain a lithium iron phosphate lithium ion battery cathode material.

[0064...

Embodiment 3

[0067] Design Li according to composition 1+x Fe 1-x PO 4 (x=0.07) to prepare Li with excess lithium and insufficient iron 1.07 Fe 0.93 PO 4 material.

[0068] Add 0.0024mol of acrylic acid to 100ml of deionized water, add 0.0048mol of fructose after the acrylic acid is dissolved; stir at room temperature until completely dissolved into a transparent solution; add 0.02568mol of lithium nitrate and 0.024mol of diammonium hydrogen phosphate to the above In the transparent solution, stir until it is uniform and transparent, then add 0.02232 mol of ferric chloride and continue to stir for 3 hours at room temperature; the mixture is stirred and evaporated to dryness at a constant temperature of 80°C to obtain the precursor; the precursor is pretreated at 280°C After thermal decomposition for 2.5 hours, the preheated decomposition product is ground; the ground product is heat-treated at 500° C. for 8 hours under a helium atmosphere, and the positive electrode material for lithium iron p...

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 lithium ion battery positive electrode material and a preparation method and application thereof. The positive electrode material is lithium iron phosphate, wherein the lithium iron phosphate is obtained by nonstoichiometry constituent design on LiFePO4, the structural formula of the positive electrode material is Li<1+x>Fe<1-x>PO<4>, and x is more than 0 but less than or equal to 0.1. The invention proposes a constituent design method for deviated LiFePO4 standard chemometry to improve the electrochemical property of the lithium ion battery positive electrode material, namely, the concentration of ferric iron polarons is improved by employing an appropriately excessive amount of lithium and an insufficient amount of iron and controlling lithium-iron mutual occupancy, the performance of the lithium iron phosphate (LiFePO4) is further improved, the obtained positive electrode material is high in purity, nanometer particles are assembled to form a micrometer structure, and the positive electrode material is high in tap density and has excellent conductivity and electrochemical performance. The lithium iron phosphate positive electrode material is prepared by a sol-gel method, the lithium ion battery positive electrode material is simple in process and relatively low in cost, and mass preparation and production are facilitated.

Description

Technical field [0001] The invention relates to the field of lithium-ion battery material manufacturing, in particular to a lithium-ion battery anode material and a preparation method and application thereof. Background technique [0002] With the increasingly serious environmental and energy problems, electric vehicles have attracted the attention of automobile manufacturers, governments and users. For electric vehicles, the power battery is its most critical component, which largely determines the performance of the vehicle. Due to the advantages of high working voltage, high specific energy, high specific power, long cycle life, low self-discharge, and no memory effect, lithium-ion batteries are gradually replacing traditional lead-acid batteries, nickel-cadmium and nickel-hydrogen batteries, and gradually become power batteries. Mainstream of development. In order to further improve the endurance of electric vehicles, people have put forward higher requirements for the ener...

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): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 褚卫国蒋毅田瑞源王汉夫
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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