Preparation method of zinc oxide compound lithium iron phosphate positive electrode material

A technology for compounding lithium iron phosphate and positive electrode material, which is applied to battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of complex preparation process, uneven phase, and large particle size of powder materials, and achieves the preparation method. Simple, uniform phase, small particle size effect

Active Publication Date: 2018-09-14
AOYANG GRP CO LTD
View PDF15 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method for preparing zinc oxide composite lithium iron phosphate powder material in the prior art has the disadvantages of complex preparation process and uneven phase, and at the same time, the particle size of the prepared powder material is relatively large

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

[0018] The invention discloses a method for preparing a zinc oxide composite lithium iron phosphate cathode material, comprising:

[0019] (1) Add ferrous nitrate and lithium nitrate (NH 4 ) 2 HPO 4 -NH 4 h 2 PO 4 In the acidic buffer solution, stir for 10-30 minutes under heating conditions to obtain a mixed solution;

[0020] (2) Under the condition of stirring, add ammoniacal liquor in above-mentioned mixed solution, the pH value of adjusting mixed solution is alkalescent, then add an appropriate amount of zinc salt solution dropwise, stir, after the precipitation is finished, stop reaction, obtain precipitation and a mixture of solutions;

[0021] (3) Vacuum filter the mixture of the above precipitate and solution, vacuum dry it at 75-80°C for 10-15 hours, grind it into powder, and pre-calcine the obtained powder at 300-400°C for 5 hours in an inert atmosphere. ~10h, then calcined at 600~800°C for 8~12h, and ground to obtain zinc oxide composite lithium iron phospha...

Embodiment 1

[0029] (1) Add ferrous nitrate and lithium nitrate with a molar ratio of 1:2 to (NH 4 ) 2 HPO 4 -NH 4 h 2 PO 4 In the acidic buffer solution, stir for 10 minutes under heating to obtain a mixed solution;

[0030] (2) Under stirring conditions, add ammonia water to the above mixed solution, adjust the pH value of the mixed solution to 9, then add an appropriate amount of zinc salt solution dropwise until the precipitation does not increase, stop the reaction, and obtain a mixture of the precipitation and the solution ;

[0031] (3) Vacuum filter the mixture of the above precipitate and solution, dry it in vacuum at 75°C for 10 hours, grind it into powder, pre-calcine the obtained powder at 300°C for 5 hours in an argon atmosphere, and then heat it at 600°C Calcined for 8 hours under the conditions, and ground to obtain the zinc oxide composite lithium iron phosphate positive electrode material.

Embodiment 2

[0033] (1) Add ferrous nitrate and lithium nitrate with a molar ratio of 1:3 to (NH 4 ) 2 HPO 4 -NH 4 h 2 PO 4 In the acidic buffer solution, stir for 20 minutes under heating conditions to obtain a mixed solution;

[0034] (2) Under stirring conditions, add ammonia water to the above mixed solution, adjust the pH value of the mixed solution to 10, then add an appropriate amount of zinc salt solution dropwise until the precipitation does not increase, stop the reaction, and obtain a mixture of the precipitation and the solution ;

[0035] (3) Vacuum filter the mixture of the above precipitate and solution, dry it in vacuum at 78°C for 12 hours, grind it into powder, pre-calcine the obtained powder at 350°C for 8 hours in an argon atmosphere, and then heat it at 700°C Calcining for 10 hours under the condition, and grinding to obtain zinc oxide composite lithium iron phosphate positive electrode material.

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 discloses a preparation method of a zinc oxide compound lithium iron phosphate positive electrode material. The preparation method comprises the following steps: (1) adding ferrous nitrate and lithium nitrate into a (NH4)2HPO4-NH4H2PO4 acidic buffering solution; stirring for 10 to 30min under a heating condition to obtain a mixed solution; (2) under a stirring condition, adding ammonia water into the mixed solution and adjusting the pH (Potential of Hydrogen) value of the mixed solution to be alkaline; then adding a proper amount of a zinc salt solution drop by drop and stirring;after finishing precipitation, stopping reaction to obtain a mixture of sediment and the solution; (3) carrying out vacuum filtering on the mixture of the sediment and the solution; drying in vacuumfor 10 to 15h under the condition that the temperature is 75 to 80 DEG C; grinding the mixture into powder; pre-firing the obtained powder in an inert atmosphere under the condition that the temperature is 300 to 400 DEG C; then calcining for 8 to 12h under the condition that the temperature is 600 to 800 DEG C; grinding to obtain the zinc oxide compound lithium iron phosphate positive electrode material The preparation method disclosed by the invention is simple and the phase is uniform, the prepared zinc oxide compound lithium iron phosphate positive electrode material has the advantages ofsmall and uniform particle size.

Description

technical field [0001] The invention relates to the technical field of battery electrode materials, in particular to a preparation method of a zinc oxide composite lithium iron phosphate cathode material. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) can be used as the positive electrode material of lithium-ion batteries. This material has many significant advantages such as high theoretical capacity, good safety performance, environmental friendliness, wide source of raw materials, and low raw material cost. However, this material also has obvious shortcomings such as low electronic and ion conductivity, which limits the commercial development of this material to a certain extent. Theory proves that doping a certain amount of metal cations in the lithium iron phosphate cathode material can significantly improve the electronic and ion conductivity of the material. Zn 2+ with Fe 2+ The ionic radius is similar, doping a small amount of zinc ions and zinc...

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): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 沈学如
Owner AOYANG GRP CO LTD
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