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Preparation method of composite lithium iron phosphate material

A technology of lithium iron phosphate and slurry, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of easy oxidation of ferrous iron, limit application, and hinder the process of industrialization, so as to achieve industrial production and process reliability. The effect of high repeatability and improved high-magnification performance

Active Publication Date: 2011-09-14
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its low electrical conductivity, the rate performance is poor, which greatly limits its application in the practical field, and there are many problems in the preparation process, such as difficult mixing of raw materials and easy oxidation of divalent iron, which increase the difficulty of synthesis and greatly hinder its industrialization process

Method used

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  • Preparation method of composite lithium iron phosphate material
  • Preparation method of composite lithium iron phosphate material
  • Preparation method of composite lithium iron phosphate material

Examples

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Embodiment 1

[0023] 1.98mol Fe(NO 3 ) 3 , 2mol LiH 2 PO 4 , 0.01TiO 2 , 0.01MnO 2 , 4mol citric acid was added to the pressure cooker, and then 40% deionized water was added, argon was passed and the pressure was kept at 0.1 MPa, and the stirring was continued at 120° C. for 3 hours, so that the raw materials were fully reacted and mixed uniformly. After the reaction, cool down to room temperature naturally, take out the gas and place it in a tray, dry it in a blast drying oven at 100°C, and pass it through a 100-mesh sieve. A pit furnace is used for sintering, and the obtained materials are placed in a special tank, vacuumed and filled with argon, and kept ventilated during the sintering process. The heating rate is 5°C / min, the temperature is raised to 300°C, the temperature is kept for 5h, and naturally cooled to After room temperature, take out through a 200-mesh sieve. Finally, put the sieved primary sintered material in the well-type furnace, vacuumize and fill with argon, and ...

Embodiment 2

[0025] 1.98mol Fe(NO 3 ) 3 , 2mol LiH 2 PO 4 , 0.01Y 2 o 3 , 4mol citric acid was added to the pressure cooker, and then 30% deionized water was added, argon was passed and the pressure was kept at 0.2MPa, and the stirring was continued at 120° C. for 5 hours, so that the raw materials were fully reacted and mixed uniformly. After the reaction, cool down to room temperature naturally, take out the gas and place it in a tray, dry it in a blast drying oven at 100°C, and pass it through a 100-mesh sieve. A pit furnace is used for sintering, and the obtained materials are placed in a special tank, vacuumed and filled with argon, and kept ventilated during the sintering process. The heating rate is 5°C / min, the temperature is raised to 300°C, the temperature is kept for 5h, and naturally cooled to After room temperature, take out through a 200-mesh sieve. Finally, place the sieved primary sintered material in a well-type furnace, vacuumize and fill with argon, and keep ventil...

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Abstract

A preparation method of a composite lithium iron phosphate material relates to a lithium ion battery cathode material. The method comprises the following steps: feeding main raw materials of Fe(NO)3, LiH2PO4, oxide doped with metal ions, and a polymer organic carbon source into an autoclave according to a stoichiometric ratio, adding water and argon to allow the raw materials to react and to be mixed well so as to obtain a slurry; cooling the slurry, drying and sieving; sintering the materials in argon atmosphere to obtain primary sintered materials; sieving the primary sintered materials, continuing to sinter the materials in argon atmosphere, cooling to obtain a composite lithium iron phosphate material. The prepared composite lithium iron phosphate material has high conductivity and excellent electrochemical performance, and the process is stable and simple, is easy for industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a preparation method of a composite lithium iron phosphate material. Background technique [0002] With the rapid development of modern industrial civilization, the demand for energy is increasing. Lithium-ion secondary batteries have become important candidates for light-duty high-energy power batteries and space power supplies for electric vehicles in the future due to their high operating voltage, high specific energy, and long cycle life. Lithium iron phosphate, one of the cathode materials for lithium-ion batteries, has attracted widespread attention and research since Padhi et al. reported it in 1997. [0003] Especially in recent years, LiFePO 4 With its high energy density, high cycle life, environmental friendliness, low price, and excellent safety performance, it has become one of the most promising cathode materials to replace lithium cobalt oxide, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 杨金洪章明王耀南陈惠明钱文连
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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