Zinc and fluorine-doped carbon-coated lithium manganese phosphate cathode material and preparation method thereof

A technology of carbon-coated lithium manganese phosphate and positive electrode materials, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems of low actual capacity and poor cycle performance, and achieve large-scale production, easy control, and simple operation Effect

Inactive Publication Date: 2011-11-30
NINGBO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of the existing lithium manganese phosphate positive electrode material with low actual capacity and poor cycle performance, and to provide a carbon-coated lithium manganese phosphate positive electrode material doped with zinc and fluorine. Significantly improve the electronic conductivity and lithium ion migration rate of lithium manganese phosphate cathode material, thereby improving the actual capacity and cycle performance of lithium manganese phosphate cathode material

Method used

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  • Zinc and fluorine-doped carbon-coated lithium manganese phosphate cathode material and preparation method thereof
  • Zinc and fluorine-doped carbon-coated lithium manganese phosphate cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Accurately weigh 0.1 mol lithium hydroxide, 0.09 mol manganese oxalate, 0.01 mol zinc hydroxide, 0.012 mol ammonium fluoride, 0.096 mol ammonium dihydrogen phosphate, and 10 g citric acid, mix them evenly, and put them into the ball mill tank of the planetary ball mill , Then add 30 ml of deionized water as the mixing medium, ball mill for 6 hours, the ball mill mixes evenly into the precursor of the rheological phase state, put the precursor in the rheological phase state in the tube furnace, under the protection of high-purity nitrogen Calcined, heated to 650°C at a heating rate of 2°C / min, kept for 15 hours, and cooled to room temperature with the furnace to obtain a zinc- and fluorine-doped carbon-coated lithium manganese phosphate cathode material LiZn 0.1 Mn 0.9 (PO 4 ) 0.96 F 0.12 / C (The XRD pattern of the zinc and fluorine doped carbon-coated lithium manganese phosphate cathode material is shown in figure 1 ).

[0029] Coating the synthesized zinc and fluorine-dope...

Embodiment 2

[0031] Accurately weigh out 0.094mol lithium acetate, 0.095mol manganese acetate, 0.005mol zinc acetate, 0.006mol lithium fluoride, 0.098mol ammonium hydrogen phosphate, and 12 g polyethylene glycol, mix them evenly and put them into the ball mill tank of the planetary ball mill. Then add 35 ml of ethanol as the mixing medium, ball mill for 4 hours, the ball mill mixes evenly into the precursor in the rheological phase state, put the precursor in the rheological phase state in a tube furnace, and calcine under the protection of high-purity argon. Heat to 750°C at a heating rate of 4°C / min, keep it for 12 hours, and then cool down to room temperature with the furnace to obtain a zinc- and fluorine-doped carbon-coated lithium manganese phosphate cathode material LiZn 0.05 Mn 0.95 (PO 4 ) 0.98 F 0.06 / C.

[0032] Coating the synthesized zinc and fluorine-doped carbon with LiZn as the cathode material of lithium manganese phosphate 0.05 Mn 0.95 (PO 4 ) 0.98 F 0.06 / C is mixed with ace...

Embodiment 3

[0034] Accurately weigh out 0.05mol lithium carbonate, 0.085mol manganese acetate, 0.015mol zinc oxide, 0.009mol ammonium fluoride, 0.097mol ammonium phosphate, 15g glucose, mix them evenly, put them into the ball mill jar of the planetary ball mill, and then add 40ml ring Hexane is used as the mixing medium for 8 hours of ball milling. The ball mill mixes the precursors uniformly into a rheological phase state. The precursors in the rheological phase state are placed in a tube furnace and calcined under the protection of high-purity argon at 5°C. The heating rate is heated to 850℃ / min, kept for 8 hours, and then cooled to room temperature with the furnace to obtain the zinc and fluorine-doped carbon-coated lithium manganese phosphate cathode material LiZn 0.15 Mn 0.85 (PO 4 ) 0.97 F 0.09 / C.

[0035] Coating the synthesized zinc and fluorine-doped carbon with LiZn as the cathode material of lithium manganese phosphate 0.15 Mn 0.85 (PO 4 ) 0.97 F 0.09 / C is mixed with acetylene bl...

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Abstract

The invention discloses a zinc and fluorine doped carbon coating lithium manganese phosphate positive electrode material and a preparation method thereof, aiming at solving the problems of over low practical capacity and poor cycle performance in the traditional lithium manganese phosphate positive electrode material. A rare earth doped lithium manganese phosphate positive electrode materials of the invention is prepared from raw materials such as a lithium source compound, a zinc source compound, a manganese source compound, a phosphorus source compound, a fluorine source compound and a carbon source compound; the zinc and fluorine doped carbon coating lithium manganese phosphate positive electrode material is expressed by a chemical formula LiZnxMn1-x (PO4) (1-Y) F3y/C, wherein x is larger than 0 and is less than or equal to 0.2, and y is larger than 0 and is less than or equal to 0.05. The electrical conductivity of electrons and the migration rate of ions of the lithium manganese phosphate positive electrode material are obviously increased by doping zinc and fluorine, thereby the practical capacity and the cycle performance of the lithium manganese phosphate positive electrode material are increased.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery positive electrode material production, and particularly relates to a zinc and fluorine doped carbon-coated lithium manganese phosphate positive electrode material for lithium ion and a preparation method thereof. Background technique [0002] With the rapid development of information technology and the increasing emphasis on environmental protection, people have put forward higher requirements for the amount and quality of chemical power sources, especially secondary batteries. The lithium-ion battery has the characteristics of high energy, long life, low cost, and low pollution, making it widely used in emerging high-tech portable electronic products such as mobile phones, portable computers, cordless power tools and video cameras, etc. , And demonstrated broad application prospects and potential huge economic benefits in the defense industry, electric vehicles, and space technology. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 袁正勇邹澜
Owner NINGBO POLYTECHNIC
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