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Lithium iron vanadium manganese phosphate nano oxide compound anode material and preparation method thereof

A technology of lithium iron vanadium manganese phosphate and composite positive electrode materials, which is applied in battery electrodes, electrical components, circuits, etc., and can solve problems that have not been seen before

Active Publication Date: 2013-01-23
中科(马鞍山)新材料科创园有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there is no research on the combination of lithium iron phosphate, lithium manganese phosphate and lithium vanadium phosphate to make positive electrode materials to give full play to their respective advantages at the same time, and make them composite with nano-oxides to prepare iron-vanadium-manganese-manganese-lithium nano-oxide composite positive electrode materials successful reports of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Prepare iron vanadium manganese lithium nano oxide composite positive electrode material according to the following method:

[0064] (1) According to the chemical formula Li 1.12 Fe 0.9 V 0.04 mn 0.06 (PO 4 ) 1.12 Weigh an appropriate amount of lithium carbonate, ferrous oxalate, vanadium pentoxide, manganese carbonate and ammonium dihydrogen phosphate, add them to a high-energy ball mill, and ball mill at a speed of 200r / min for 16 hours to mix evenly to obtain iron vanadium manganese phosphate Compound Li 1.12 Fe 0.9 V 0.04 mn 0.06 (PO 4 ) 1.12 ;

[0065] (2) Press the product after ball milling in step (1) into a disc under a pressure of 12MPa, and under the protection of high-purity argon, raise the temperature to 550°C at a heating rate of 15°C / min, and pre-burn for 1h;

[0066] (3) Pulverize the pre-calcined product in step (2), and add iron vanadium manganese lithium compound Li 1.12 Fe 0.9 V 0.04 mn 0.06 (PO 4 ) 1.12 A mixture of 0.1% by mass o...

Embodiment 2

[0070] Prepare iron vanadium manganese lithium nano oxide composite positive electrode material according to the following method:

[0071] (1) According to the chemical formula Li 1.2 Fe 0.8 V 0.2 mn 0.1 (PO 4 ) 1.2 Weigh an appropriate amount of lithium hydroxide, ferrous oxalate, ammonium metavanadate, manganese acetate and ammonium dihydrogen phosphate, add them to a high-energy ball mill, and mix them uniformly at a speed of 1000r / min for 2 hours to obtain iron vanadium phosphate Manganese lithium compound Li 1.2 Fe 0.8 V 0.2 mn 0.1 (PO 4 ) 1.2 ;

[0072] (2) Press the product after ball milling in step (1) into a disc under a pressure of 1MPa, and under the protection of high-purity nitrogen, raise the temperature to 300°C at a heating rate of 2°C / min, and pre-burn for 15h;

[0073] (3) Pulverize the pre-calcined product in step (2), and add iron vanadium manganese lithium compound Li 1.2 Fe 0.8 V 0.2 mn 0.1 (PO 4 ) 1.2 A mixture of 5% by mass of nano-t...

Embodiment 3

[0077] Prepare iron vanadium manganese lithium nano oxide composite positive electrode material according to the following method:

[0078] (1) According to the chemical formula Li 1.4 Fe 0.6 V 0.4 mn 0.2 (PO 4 ) 1.4 Weigh an appropriate amount of lithium hydroxide, ferrous acetate, ammonium metavanadate, manganese oxalate and triammonium phosphate, add them to a high-energy ball mill, and ball mill at a speed of 800r / min for 6 hours to mix evenly to obtain iron vanadium manganese phosphate Lithium compound Li 1.4 Fe 0.6 V 0.4 mn 0.2 (PO 4 ) 1.4 ;

[0079] (2) The ball-milled product in step (1) was pressed into a disc under a pressure of 3 MPa, and the volume fraction was 0.5% H 2 Under the protection of high-purity nitrogen, the temperature was raised to 350°C at a heating rate of 5°C / min, and pre-burned for 12 hours;

[0080] (3) Pulverize the pre-calcined product in step (2), and add iron vanadium manganese lithium compound Li 1.4 Fe 0.6 V 0.4 mn 0.2 (PO ...

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Abstract

The invention relates to a lithium iron vanadium manganese phosphate nano oxide compound anode material and a preparation method thereof. The lithium iron vanadium manganese phosphate nano oxide compound anode material comprises a component A and a compound B carbon source, wherein the component A comprises 95-99.9wt% of lithium iron vanadium manganese phosphate compound Lix+3y+zFexV2yMnz(PO4)x+3y+z and 0.1-5wt% of nano oxide; and the component B carbon source accounts for 0.5-35wt% by mass of the lithium iron vanadium manganese phosphate compound Lix+3y+zFexV2yMnz(PO4)x+3y+z in the component A. The preparation method of the compound anode material comprises the steps of: firstly weighing a lithium source, an iron source, a vanadium source, a manganese source and a phosphorus source according to proportions, uniformly ball-grinding and mixing, pre-sintering after tabletting, crushing, adding the nano oxide and the component B carbon source, ball-grinding, calcining, crushing and refining. The lithium iron vanadium manganese phosphate nano oxide compound anode material provided by the invention has better crystallinity and conductivity as well as high specific capacity, and has wide application prospects in the field of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials, and relates to a lithium ion secondary battery positive electrode material, in particular to a composite positive electrode material of iron phosphate vanadium manganese lithium nanometer oxide and a preparation method thereof. Background technique [0002] Due to the advantages of high working voltage, high specific energy, no memory effect, no pollution, small self-discharge, and long cycle life, lithium-ion batteries are gradually replacing traditional secondary batteries such as nickel-cadmium and nickel-metal hydride, and have become the most efficient battery at present. Excellent new-generation secondary batteries have been widely used in mobile communications, electric bicycles, electric tools, various portable instruments and equipment, etc. [0003] In recent years, olivine-structured lithium iron phosphate (LiFePO 4 ) is widely recognized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 谭强强徐宇兴
Owner 中科(马鞍山)新材料科创园有限公司
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