Method for synthesizing lithium iron phosphate battery anode material by microwave

A technology of lithium iron phosphate and cathode material, which is applied in battery electrodes, chemical instruments and methods, circuits, etc.

Inactive Publication Date: 2008-02-13
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses absorption materials that can absorb microwaves for creation of an atmospheric environment inside a reactor chamber during chemical processes without requiring any other gases or solvents like nitrogen dioxide (NO2) used by others involved.

Problems solved by technology

Technological Problem addressed in this patents relates to finding ways to improve the properties (such as electrical characteristics) of luminum ion batteries without requiring costly processes like vacuum heat treatment during their production process.

Method used

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  • Method for synthesizing lithium iron phosphate battery anode material by microwave

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preparation example Construction

[0007] (1) Preparation of precursors: Accurately weigh lithium salt, ferrous salt, phosphate and metal salt or carbon doping raw materials for doping according to the stoichiometric ratio, grind them in a mortar, and then put them into a Continue to grind in the mortar for 1 hour before use.

[0008] (2) A microwave reaction device that can provide a protective atmosphere: Dig a groove in the refractory material, put it into a heat conduction dish and fill the gap with a microwave absorbent, and put an appropriate amount of microwave air sealant in the heat conduction dish. Put the precursor into the reaction vessel, put the reaction vessel into the heat conduction vessel and cover it with the matching cover of the reaction vessel, which can cover the edge of the reaction vessel and contact the inner wall of the heat conduction vessel. Cover the lid of the reaction vessel with a microwave air sealant, and at this time turn the air seal vessel upside down on the heat-resistant ...

Embodiment 1

[0012] Using microwave reaction to form pure phase lithium iron phosphate

[0013] Accurately weigh lithium acetate, ferrous oxalate, and ammonium dihydrogen phosphate according to the stoichiometric ratio, grind them evenly in a mortar, place them in a reaction device, heat them in a household microwave oven for 15 minutes, and then use an X-ray diffractometer to determine the structure of the product. The XRD pattern of the product is consistent with the peak position of lithium iron phosphate (JCPDS No.40-1499), indicating that the product is lithium iron phosphate. The product was placed in hydrochloric acid with a concentration of 10M, and the solid was completely dissolved without precipitation, which proved that the final product contained no carbon. It is proved that pure-phase lithium ferrous phosphate can be obtained by adopting the method of the present invention, which overcomes the defect that carbonaceous materials must be mixed in the method for synthesizing lit...

Embodiment 2

[0015] Synthesis of Lithium Iron Phosphate Doped with Copper Ions by Microwave Reaction

[0016] Accurately weigh lithium acetate, ferrous oxalate, ammonium dihydrogen phosphate, and copper acetate according to the stoichiometric ratio, grind them evenly in a mortar, place them in a reaction device, heat them in a household microwave oven for 15 minutes, and then test the products with an X-ray diffractometer. Structure determination. The XRD pattern of the product is consistent with the peak position of lithium ferrous phosphate (JCPDS No.40-1499), and there is no impurity peak of copper ions, indicating that copper ions enter the crystal phase of lithium ferrous phosphate, and the doped and undoped products have the same Crystal structure.

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Abstract

The present invention belongs to the technological field of a high energy battery, in particular to the technological field of an anode material used by a synthetic lithium ion battery. The present invention relates to a method of synthesizing a lithium iron (11) phosphate or modifying the lithium iron (11) phosphate by a chemical reaction in a microwave oven. The present invention is characterized in that adopting an atmoseal to protect the isolated air overcomes the disadvantage that a reducer can remain in the production when a solid-phase reducing agent is added directly to synthesize the lithium iron (11) phosphate material. The lithium iron (11) phosphate LiFePO4 can be synthesized and the lithium iron (11) phosphate can be modified LiFe1-xMxPO4 (M is equal to La, Co, Ni, Mn, Cr, Cu, Nd, Pr, Gd, C, Ce, Mo; x is more than or equal to 0 and less than or equal to 1) by combining the microwave synthesis with a so-gel, a coprecipitation and a hydrothermal synthesis and adopting a metal doping, a metal ion doping, a carbon doping and others.

Description

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Claims

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Application Information

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Owner XINJIANG UNIVERSITY
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