Unlock instant, AI-driven research and patent intelligence for your innovation.

Fluxing agent large-area multipoint rapid nucleation crystal growth method of lithium ion battery cathode material

A technology for lithium ion batteries and cathode materials, which is applied in the directions of crystal growth, polycrystalline material growth, single crystal growth, etc., can solve the problem that the preparation technology of single crystal cathode materials has not been fully developed, and achieves fast nucleation and crystallization speed, Increase the nucleation area and the effect of good crystal face development

Pending Publication Date: 2021-04-13
ZAOZHUANG UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, although single crystals have many advantages over traditional spherical secondary particles, the preparation technology of single crystal cathode materials is still in a stage that has not yet been fully developed.

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
  • Fluxing agent large-area multipoint rapid nucleation crystal growth method of lithium ion battery cathode material
  • Fluxing agent large-area multipoint rapid nucleation crystal growth method of lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Single crystal cathode material LiMnPO 4 preparation.

[0027] According to the stoichiometric ratio, the initial raw material lithium acetate LiCH 3 CO 2 ∙2H 2 O, manganese acetate Mn(CH 3 CO 2 ) 2 , Diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 and Ammonium Hydroxide NH 4 OH was dissolved in deionized water, magnetically stirred for 30 minutes, and the stirring temperature was 80 o C; add co-solvent lithium sulfate Li2SO4 gradually, adjust the content of co-solvent so that the concentration of metal manganese ions is 0.07 mol / L; add excess LiCH gradually 3 CO 2 ∙2H 2 O, the control lithium-rich environment is: stoichiometric lithium concentration: actual lithium concentration = 1: 1.03; add a small amount of porous silicon carbide in the solution; add a certain amount of acetic acid or ammonia water to adjust the pH value of the melt to 7; then put the test tube Placed in a microwave hydrothermal furnace for reaction, the reaction time was 5 minutes, and ...

Embodiment 2

[0034] Single Crystal Cathode Material LiCoPO 4 preparation.

[0035] According to the stoichiometric ratio, the initial raw material lithium acetate LiCH 3 CO 2 ∙2H 2 O, cobaltous acetate Co(CH 3 CO 2 ) 2 , Diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 and Ammonium Hydroxide NH 4 OH was dissolved in deionized water, stirred magnetically for 20 minutes, and the stirring temperature was 70 o C; add co-solvent lithium iodate LiIO3 gradually, adjust the content of co-solvent so that the concentration of metal manganese ions is 0.09 mol / L; add excess LiCH gradually 3 CO 2 ∙2H 2 O, the control lithium-rich environment is: stoichiometric lithium concentration: actual lithium concentration = 1: 1.2; add a small amount of carbon porous material in the solution; add a certain amount of acetic acid or ammonia water to adjust the pH value of the melt to 8; then put the test tube Placed in a microwave hydrothermal oven for reaction, the reaction time was 10 minutes, and the r...

Embodiment 3

[0037] Single crystal cathode material LiFePO 4 preparation.

[0038] According to the stoichiometric ratio, the initial raw material lithium acetate LiCH 3 CO 2 ∙2H 2 O, ferrous acetate Co(CH 3 CO 2 ) 2 , Diammonium hydrogen phosphate (NH 4 ) 2 HPO 4 and Ammonium Hydroxide NH 4 OH was dissolved in deionized water, magnetically stirred for 30 minutes, and the stirring temperature was 90 o C; add co-solvent lithium iodate LiIO3 gradually, adjust the content of co-solvent so that the concentration of metal manganese ions is 0.1 mol / L; add excess LiCH gradually 3 CO 2 ∙2H 2 O, the control lithium-rich environment is: stoichiometric lithium concentration: actual lithium concentration = 1: 1.3; add a small amount of porous alumina in the solution; add a certain amount of acetic acid or ammonia to adjust the pH value of the melt to 9; then put the test tube Placed in a microwave hydrothermal oven for reaction, the reaction time was 15 minutes, and the reaction temperatu...

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 fluxing agent large-area multipoint rapid nucleation crystal growth method of a lithium ion battery cathode material. The method comprises the following steps: dissolving a lithium source, a transition metal source and a chelating agent in a stoichiometric ratio into deionized water according to the chemical formula of the lithium ion battery cathode material to form a primary solution; adding a fluxing agent to improve the solubility of the transition metal source, performing full stirring until solute is completely dissolved, and forming a transparent secondary solution; adding a small amount of lithium source to form a lithium-rich environment; then adding a solid porous template agent to increase the nucleation area and the number of nucleation points; dropwise adding acetic acid or ammonia water, and adjusting the pH value; then putting an obtained mixture into a microwave hydrothermal reactor for full reaction; and finally, carrying out solid-liquid separation, cleaning and drying on a reaction product to obtain the lithium ion battery cathode material. The lithium ion battery cathode material obtained by the method is uniform in granularity, high in crystallinity, good in crystal face development and high in nucleation and crystallization speed. According to the method, the nucleation area and the number of nucleation points are greatly increased, and adsorption and agglomeration between crystal grains can be prevented.

Description

technical field [0001] The invention relates to a large-area multi-point rapid nucleation crystal growth method for a lithium-ion battery anode material flux, and belongs to the cross technical field of crystal materials and lithium-ion batteries. Background technique [0002] In recent years, the rapid development of new energy vehicles has put forward higher and higher requirements for the energy density of power lithium-ion batteries. For mainstream lithium iron phosphate and ternary NCM power lithium batteries, increasing the nickel content and charging voltage are two commonly used means of increasing capacity. However, as the nickel content and charging voltage increase, the grain boundaries of the positive electrode material particles will be cracked or even broken, and the cycle performance and safety performance will deteriorate sharply. This technical bottleneck seriously hinders the development of high-capacity battery products. [0003] In recent years, people ...

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): C30B7/10C30B29/22H01M4/58H01M10/0525
CPCC30B7/105C30B29/22H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 王坤鹏张建秀周利范立群任衍彪李凤丽刘泳
Owner ZAOZHUANG UNIV