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Hydrothermal preparation method of zinc oxide-lithium iron phosphate composite anode material

A composite lithium iron phosphate and positive electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low electronic and ion conductivity and limit commercial development

Inactive Publication Date: 2011-11-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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.

Method used

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  • Hydrothermal preparation method of zinc oxide-lithium iron phosphate composite anode material
  • Hydrothermal preparation method of zinc oxide-lithium iron phosphate composite anode material
  • Hydrothermal preparation method of zinc oxide-lithium iron phosphate composite anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0020] [1] Take 10ml of 1.5mol / L LiOH solution, mix 10ml of 0.5mol / L H 3 PO 4 The solution was slowly dropped into the LiOH solution drop by drop, and stirred thoroughly for 1 hour to obtain a white colloidal solution A.

[0021] [2] Another 0.5mol / L of Zn(Ac) 2 Solution 1ml, 1.5mol / L lithium hydroxide solution 1ml, mix in ice-water bath and continue to stir for 2 hours to obtain white precipitate solution B.

[0022] [3] In the case of vigorous stirring, slowly add B solution to A, and continue to fully stir for 2 hours to form a mixed solution C.

[0023] [4] Take 0.005mol FeSO 4 Dissolve in 20ml of deionized water to form a ferrous sulfate solution, and quickly add the ferrous sulfate solution to the mixed solution C, stir for 1min, and form a dark green mixed solution D.

[0024] [5] Move the mixed solution D into the reactor, react at 180°C for 16 hours, take samples after natural cooling, wash with a large amount of deionized water, and dry at 80°C for 12 hours to ob...

Embodiment 2

[0026] The steps are the same as those in Example 1, except that the lithium source in [1] is LiCl.

Embodiment 3

[0028] The step is the same as that in Example 1, except that the lithium source in [1] is LiCH 3 COO.

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Abstract

The invention relates to a hydrothermal preparation method of a zinc oxide-lithium iron phosphate composite anode material. The method comprises the following steps: respectively preparing a lithium phosphate colloidal solution and a zinc oxide precursor solution at first, then fully stirring the lithium phosphate colloidal solution and the zinc oxide precursor solution and mixing them, finally adding a bivalent iron solution to form a lithium iron phosphate precursor solution, then moving into a reaction vessel, wherein the range of the reaction temperature is from 100 DEG C to 350 DEG C and the reaction time is 3 - 30 hours, performing a process of natural cooling to a sample and then taking it out, washing with an amount of deionized water, drying at the temperature of 80 DEG C thus obtaining lithium iron phosphate powders composited by ZnO particles. According to the invention, a chemical reaction is performed by using the method in fluids such as aqueous solution or water vapor at high temperature and high pressure , the nanometer level lithium iron phosphate cathode material can be prepared, compared with the lithium iron phosphate produced by a solid phase method, the method of the invention has the advantages of simple operation, no required inert atmosphere, uniform phase, small particle size and the like, the produced lithium iron phosphate cathode material composited by zinc oxide has good electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a hydrothermal preparation method of a zinc oxide composite lithium iron phosphate cathode material. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) can be used as a cathode material for 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 oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 李瑛姚俊胡业旻陈慧明朱明原齐金和
Owner SHANGHAI UNIV