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Lithium iron manganese phosphate positive electrode material and preparation method thereof

A technology of lithium iron manganese phosphate and positive electrode material, applied in positive electrodes, chemical instruments and methods, phosphorus compounds, etc., can solve problems such as poor electrical conductivity, and achieve the effect of improving electrical conductivity, good electrical conductivity and uniform crystal structure

Inactive Publication Date: 2020-12-22
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium manganese iron phosphate LiMn 1-x Fe x PO 4 (04 modified based on developed, while a single LiMnPO 4 Almost an insulator, so the existing lithium manganese iron phosphate material (LiMn 1-x Fe x PO 4 (0

Method used

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  • Lithium iron manganese phosphate positive electrode material and preparation method thereof
  • Lithium iron manganese phosphate positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] Weigh the corresponding amount of MnSO according to the molar ratio of 55:44:1 4 , FeSO 4 , MgSO 4 Dissolve in deionized water to obtain 1L of a solution with a total concentration of metal ions of 1mol / L, and prepare 0.55L of Na with a concentration of 2mol / L 2 CO 3 solution, the two solutions were fully reacted under stirring, and the precipitate was filtered, washed, and dried to obtain Mn 0.55 Fe 0.44 Mg 0.01 CO 3 powder. Mix this powder with 36.95g Li 2 CO 3 , 115.03g NH 4 h 2 PO 4 , 16g of sucrose, mixed with appropriate amount of alcohol, fully ball-milled, and then dried. Then burn in a tube furnace with high-purity nitrogen at 700°C for 10 hours, cool to room temperature, grind and sieve, and the chemical formula is LiMn 0.55 Fe 0.44 Mg 0.01 PO 4 Lithium manganese iron phosphate material containing conductive carbon.

[0027] The lithium manganese iron phosphate material is used as the positive electrode, and the metal lithium sheet is used as ...

Embodiment 2

[0030] Weigh the corresponding amount of MnSO according to the molar ratio 67:32:0.2:0.8 4 , FeSO 4 、NiSO 4 , ZnSO 4 Dissolve in deionized water to obtain 0.5 L of a solution with a total concentration of metal ions of 2 mol / L, and prepare 1.2 L of Na with a concentration of 1 mol / L 2 CO 3 solution, the two solutions were fully reacted under stirring, and the precipitate was filtered, washed, and dried to obtain Mn 0.67 Fe 0.32 Ni 0.002 Zn 0.008 CO 3 powder. Mix this powder with 41.97g LiOH·H 2 O, 132.06g (NH 4 ) 2 HPO 4 , 18g of glucose, mixed with an appropriate amount of alcohol, fully ball-milled, and then dried. Then burn at 750°C for 12 hours in a tube furnace with high-purity nitrogen, cool to room temperature, grind and sieve, and the chemical formula is LiMn 0.67 Fe 0.32 Ni 0.002 Zn 0.008 PO 4 Lithium manganese iron phosphate material containing conductive carbon.

[0031] The lithium manganese iron phosphate material is used as the positive electro...

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Abstract

The invention provides a lithium iron manganese phosphate positive electrode material and a preparation method thereof, which belong to the technical field of lithium batteries. The problems of low gram volume, poor conductivity and the like of an existing lithium iron manganese phosphate material can be solved. The lithium iron manganese phosphate positive electrode material is characterized in that the chemical formula of a main body material is LiMn1-x-yFexMyPO4, x is larger than or equal to 0.1 and smaller than or equal to 0.5, y is larger than or equal to 0.002 and smaller than or equal to 0.02, meanwhile, carbon with the mass fraction being 0.5-3% is contained, and M is one or any combination of Mg, Ni, Co and Zn. A preparation method of a lithium iron manganese phosphate positive electrode material is characterized in that Mn1-x-yFexMyCO3 is prepared through a solution reaction, and then the lithium iron manganese phosphate material is obtained through a solid-phase reaction. The preparation method provided by the invention is rich and cheap in raw materials, simple and convenient in technological process and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a lithium iron manganese phosphate cathode material and a preparation method thereof. Background technique [0002] In today's society, energy issues and environmental issues have attracted widespread attention. Secondary batteries can not only be used as energy storage tools to promote the development of solar power generation and wind power generation, but also can be used as energy sources for vehicles to reduce the use of fossil fuels and vehicles. Emissions. Among all kinds of secondary batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental friendliness, and have been widely used in various portable electronic products, power tools, electric vehicles and other fields. [0003] Lithium-ion batteries can choose lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, nickel cobalt lithium mangane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/505H01M4/525H01M4/58H01M10/0525H01M4/02
CPCC01B25/45H01M4/525H01M4/505H01M4/5825H01M10/0525H01M2004/028C01P2006/40C01P2004/03Y02E60/10
Inventor 张天任周建中施利勇郭鑫孙伟
Owner TIANNENG SAFT ENERGY JOINT CO
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