Preparation method for lithium ion battery manganese-based cathode materials of egg yolk-egg shell structure

A lithium-ion battery, eggshell technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as unreported, and achieve the effects of high reaction yield, uniform morphology and good crystallinity

Inactive Publication Date: 2017-02-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, as far as the applicant knows, there has been no report on the method of using microwave liquid phase to assist in the synthesis of manganese-based cathode materials for lithium-ion batteries with egg yolk-eggshell structure.

Method used

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  • Preparation method for lithium ion battery manganese-based cathode materials of egg yolk-egg shell structure
  • Preparation method for lithium ion battery manganese-based cathode materials of egg yolk-egg shell structure
  • Preparation method for lithium ion battery manganese-based cathode materials of egg yolk-egg shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Manganese nitrate and urea are dissolved in deionized water respectively, the molar concentration of manganese ions in the solution after dissolving is 1mol / L, and the molar concentration of urea is 1mol / L, and it is standby after fully dissolving;

[0022] (2) Mix the two solutions obtained in step (1), the mixing ratio is that the molar ratio of manganese ions to urea is 1:3; condense and reflux for 60 minutes under the microwave excitation heating condition with a power of 700W, and cool to room temperature naturally Centrifugal separation obtains manganese carbonate precursor;

[0023] (3) Put the manganese carbonate precursor obtained in the previous step into a high-temperature furnace for heat treatment at 400°C for 5 hours, then cool to room temperature with the furnace to obtain egg yolk-eggshell structure manganese trioxide, and then mix with lithium hydroxide in ethanol Mix thoroughly, then dry at 120°C, grind for 30 minutes to obtain the precursor powder...

Embodiment 2

[0026] (1) Manganese acetate and sodium hydroxide are dissolved in deionized water and ethylene glycol respectively, and the molar concentration of manganese ion in the solution after dissolving is 0.1mol / L, and the molar concentration of sodium hydroxide is 0.5mol / L, fully ready after dissolving;

[0027] (2) two kinds of solutions that step (1) gained are mixed, and the mixing ratio is that the mol ratio of manganese ion and sodium hydroxide is 1:1; Under the microwave excitation heating condition that power is 700W, condense and reflux for 60 minutes, cool naturally to centrifugation after room temperature to obtain the manganese carbonate precursor;

[0028] (3) Put the manganese carbonate precursor obtained in the previous step into a high-temperature furnace for heat treatment at 450°C for 6 hours, then cool down to room temperature with the furnace to obtain egg yolk-eggshell structure manganese trioxide, and then mix with lithium acetate and nickel chloride Fully mix in...

Embodiment 3

[0031] (1) manganese sulfate and sodium hydroxide are dissolved in deionized water and Virahol respectively, the molar concentration of manganese ion in the solution after dissolving is 0.2mol / L, and the molar concentration of sodium hydroxide is 0.5mol / L, fully ready after dissolving;

[0032] (2) two kinds of solutions that step (1) gained are mixed, and the mixing ratio is that the mol ratio of manganese ion and sodium hydroxide is 1:2; Under the microwave excitation heating condition that power is 700W, condense and reflux for 60 minutes, cool naturally to centrifugation after room temperature to obtain the manganese carbonate precursor;

[0033] (3) Put the manganese carbonate precursor obtained in the previous step into a high-temperature furnace for heat treatment at 500°C for 3 hours, then cool to room temperature with the furnace to obtain manganese trioxide with egg yolk-eggshell structure, and then mix with lithium carbonate, nickel sulfate, Cobalt nitrate was full...

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Abstract

The invention relates to a universal preparation method for a lithium ion battery manganese-based cathode material of an egg yolk-egg shell structure. The preparation method mainly comprises the following steps of preparing manganese salt solution and alkaline reagent solution respectively, adding the manganese salt solution and the alkaline reagent solution together to a reaction vessel according to the molar ratio of the manganese ions to the alkaline reagent of 1:(1-8) after the manganese salt solution and the alkaline reagent solution are sufficiently dissolved, stirring, and conducting reflux condensation under the condition of microwave excitation heating; after the mixed solution is cooled naturally to room temperature, conducting centrifugal separation to obtain a manganese carbonate precursor; placing the manganese carbonate precursor in a high temperature furnace for heating at 200-700 DEG C for 1-10 hours, and obtaining manganese sesquioxide of the egg yolk-egg shell structure; then obtaining the manganese-based cathode material LiMn2O4, LiNi0.5Mn1.5O4, LiNixCoyMn1-x-yO2(90<x+y<1), xLi2MnO3.(1<=x)LiNi1/3Co1/3Mn1/3O2(0<x<1),xLi2MnO3.(1<=x)LiNi0.5Mn0.5O2(0<x<1)of the egg yolk-egg shell structure through a simple high temperature solid state method. The preparation method is simple in process, easy to operate and low in cost, has the advantages of controllable preparation, large-scale synthesis and the like, and is beneficial to industrialized mass production.

Description

technical field [0001] The invention relates to a universal preparation method for a manganese-based positive electrode material of a lithium ion battery with an egg yolk-eggshell structure, in particular to the preparation of LiMn 2 o 4 , LiNi 0.5 mn 1.5 o 4 , LiNi x co y mn 1-x-y o 2 (0<x+y<1), xLi 2 MnO 3 ·(1-x)LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 (0<x<1) and xLi 2 MnO 3 ·(1-x)LiNi 0.5 mn 0.5 o 2 (0<x<1) method. Background technique [0002] With the rapid development of electric vehicles, the performance requirements of lithium-ion batteries are getting higher and higher. One of the current development trends of lithium-ion batteries is to increase their energy density while ensuring lower prices, high thermal stability, and long cycle life. Compared with the traditional lithium cobalt oxide cathode materials, manganese-based cathode materials have become promising cathode materials for lithium-ion batteries due to their advantages such as hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCH01M4/505Y02E60/10
Inventor 曹传宝吴宇张君婷
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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