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A kind of preparation method of lithium ferrous phosphate and lithium ferrous oxide composite electrode material

A lithium iron phosphate and composite electrode technology, applied in hybrid capacitor electrodes, battery electrodes, circuits, etc., can solve the problems of low specific capacity, low tap density of lithium iron phosphate, flat charge and discharge platform, etc., and achieve high specific capacity. , the effect of easy electrode forming and low equipment cost

Active Publication Date: 2016-11-02
ZHANGJIAGANG SMARTGRID FANGHUA ELECTRICAL ENERGY STORAGE RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and to provide a preparation method for lithium iron phosphate and lithium ferrous composite electrode materials that is easy to scale up industrially, and the preparation method can improve the vibration of existing lithium iron phosphate. Problems of low density, low specific capacity, and flat charging and discharging platform

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of lithium iron phosphate and lithium ferrous composite electrode materials by sol-gel method:

[0032] Take 1 mol of lithium hydroxide and 1 mol of lithium nitrite as the lithium source, 1 mol of ammonium dihydrogen phosphate as the phosphorus source, 2 mol of ferrous acetate as the iron source, and 15 g of thermoplastic phenolic resin as the carbon source, as follows:

[0033] (1) Dissolve ammonium dihydrogen phosphate in 5000 ml of solvent, ferrous acetate in 10000 ml of solvent, lithium salt (a mixture of lithium hydroxide and lithium nitrite) in 10000 ml of solvent, and phenolic resin in 1000 ml of solvent , then drop the lithium salt solution and the ferrous acetate solution into the ammonium dihydrogen phosphate solution dropwise at the same speed under stirring to form a sol, then add the phenolic resin solution to obtain a sol-gel product, wherein the solvent is ethanol and water according to A mixed solvent with a volume ratio of 1:1.

[0034] (2)...

Embodiment 2

[0039] Preparation of lithium iron phosphate and lithium ferrous composite electrode materials by direct mixing method:

[0040] Take 1 mol of lithium hydroxide and 1 mol of lithium nitrite as the lithium source, 0.9 mol of ammonium dihydrogen phosphate as the phosphorus source, 2 mol of ferrous acetate as the iron source, and 15 g of thermoplastic phenolic resin as the carbon source, as follows:

[0041] (1) Reduce the particle size of lithium source, phosphorus source, iron source, and thermoplastic phenolic resin to less than 60 mesh, mix them evenly, put them into a ball mill, and add 2 g of hexamethylenetetramine powder, the ratio of materials to balls According to the operation requirements of the ball mill, ball mill for 8 hours at a speed of 400-500 revolutions per minute to obtain the mixture. The particle size of the mixture is reduced to below 500 mesh. The resulting mixture was dried at a temperature of 120°C.

[0042] (2) The precursor powder of the lithium iron...

Embodiment 3

[0046] Preparation of lithium iron phosphate and lithium ferrous composite electrode materials by solvent mixing method:

[0047] Take 1 mol of lithium hydroxide and 1 mol of lithium nitrite as the lithium source, 1 mol of ammonium dihydrogen phosphate as the phosphorus source, 2.1 mol of ferrous acetate as the iron source, and 15 g of thermoplastic phenolic resin as the carbon source, as follows:

[0048] (1) Mix the lithium source, phosphorus source, iron source, and thermoplastic phenolic resin evenly, then add 500 ml of solvent (a mixed solvent of ethanol and water with a volume ratio of 1:1), and add 2 g of hexamethylenetetramine The powder is put into a ball mill, the ratio of the material and the balls can be in accordance with the operation requirements of the ball mill, the ball mill is 12 hours, and the speed of the ball mill is 400-500 revolutions per minute to obtain the mixture. The resulting mixture was dried at a temperature of 80°C.

[0049] (2) The precursor ...

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Abstract

The invention relates to a preparation method of a lithium iron phosphate-ferrous lithium carbonate composite electrode material. The method comprises the following steps of mixing a carbon source, a lithium source, a phosphorus source and an iron source, drying the mixed material, sequentially roasting the mixed material at a low temperature and a high temperature under a non-oxidization gas environment, and naturally cooling the mixed material, mechanically grinding and sieving so as to obtain the lithium iron phosphate-ferrous lithium carbonate composite electrode material. The preparation method provided by the invention has the advantages that the technology is simple, the cost is low, the composite electrode material prepared by the preparation method provided by the invention has the advantages that the coated carbon content is small, the tap density is high, the specific surface area is 10-30m<2> / g, the specific capacity is high, great convenience is brought for formation of an electrode, the composite electrode material is used for a hybrid super capacitor, a lithium ion battery and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a preparation method of lithium ferrous phosphate and lithium ferrous oxide composite electrode materials. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high specific power characteristics, and no memory effect. They have been widely used in communication tools, portable electric tools, electronic instruments, electric power, electric vehicles and other industries, and are generally welcomed by people. Commercial lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide, nickel-cobalt-manganese ternary materials, etc., but lithium cobalt oxide and nickel-cobalt-manganese ternary materials are less safe and are used in large-capacity and high-power environments. There are more problems in . Lithium iron phosphate cathode material is a new type of cathode material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01G11/50H01G11/30
CPCH01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 程杰尹元何柯文越华徐艳赵鹏程曹高萍杨裕生
Owner ZHANGJIAGANG SMARTGRID FANGHUA ELECTRICAL ENERGY STORAGE RES INST
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