Method for preparing lithium ionic battery anode material spherical LiFePO4 /C

A lithium-ion battery and cathode material technology, applied in the field of energy materials, can solve problems such as high cost and complicated preparation process, and achieve the effect of improving conductivity, simple process flow, and high-current electrochemical performance

Inactive Publication Date: 2008-12-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method simultaneously solves the LiFePO 4 Material bulk density and conductivity, but the preparation process is still relatively complicated, LiFePO 4 The cost of the product is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1. takes by weighing 400g Fe 2 o 3 , 660.3g (NH 4 ) 2 HPO 4 , 185.93g LiCO 3 , 39.25g conductive carbon black and 142.6g sucrose, slowly add mass concentration in the polyacrylic acid thickener aqueous solution of 20%, heat ball mill and stir mixed solution, form uniform suspension, the obtained suspension is sprayed with air flow Drying in the dryer adopts a co-current drying method, and the atomization device adopts a double-flow nozzle. Use a peristaltic pump to feed the material, the speed is 10-20mL / min, the gas flow rate of the nozzle is controlled by the pressure of the compressed air, atomization is generated at about 0.1Mpa, the temperature of the air inlet is controlled at 300°C, the outlet is at 100°C, and the outlet air passes through a Stage vortex separation and venting. The powder obtained by spray drying was heat-treated at 800 °C for 15 hours under the protection of inert gas to obtain spherical LiFePO 4 / C product. The measured tap d...

Embodiment 2

[0032] Embodiment 2. Take by weighing 400g Fe 2 o 3 , 519.8g LiH 2 PO 4 , 23.55g conductive carbon black and 150g glucose, slowly add the mass concentration in the polyethylene glycol thickener aqueous solution of 30%, heat the ball mill and stir the mixed solution to form a uniform suspension, the obtained suspension is obtained by air flow The spray dryer is used for drying, adopting the co-current drying method, and the atomization device adopts a double-flow nozzle. Use a peristaltic pump to feed the material, the speed is 10-20mL / min, the gas flow rate of the nozzle is controlled by the pressure of the compressed air, atomization is generated at about 0.1Mpa, the temperature of the air inlet is controlled at 300°C, the outlet is at 100°C, and the outlet air passes through a Stage vortex separation and venting. The powder obtained by spray drying was heat-treated at 700 °C for 20 hours under the protection of inert gas to obtain spherical LiFePO 4 / C product. The mea...

Embodiment 3

[0033] Embodiment 3. Take by weighing 400g Fe 2 o 3 , 575.2g NH 4 h 2 PO 4 , 510gCH 3 COOLi·2H 2 0, 7.85g conductive carbon black and 142.6g sucrose, slow adding mass concentration is in the adipic acid and polyvinyl alcohol mixed thickening agent aqueous solution of 5%, heat ball mill and stir mixed solution, form uniform suspension, obtained The suspension is dried with an air-flow spray dryer, using a co-current drying method, and the atomization device adopts a double-flow nozzle. Use a peristaltic pump to feed the material, the speed is 10-20mL / min, the gas flow rate of the nozzle is controlled by the pressure of the compressed air, atomization is generated at about 0.1Mpa, the temperature of the air inlet is controlled at 300°C, the outlet is at 100°C, and the outlet air passes through a Stage vortex separation and venting. The powder obtained by spray drying was heat-treated at 900 °C for 8 hours under the protection of inert gas to obtain spherical LiFePO 4 / C ...

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Abstract

A process for preparing the high-density spherical LiFePO4 / C anode material of lithium ion batteries belongs to the technical field of the energy material. The process comprises the following steps: weighing Fe2O3, a phosphate compound and a lithium-source compound by a stoichiometric ratio; slowly adding to one or more aqueous solutions of hexane diacid, polyethylene glycol, polyacrylic acid or polyvinyl alcohol, and adding one or more of conductive carbon black, sucrose and glucose in a certain amount as well as the doping ions, heating, ball-milling and stirring to form an uniform suspension; spray-drying the obtained suspension to obtain the spherical mixed powder precursor; and carrying out the heat treatment of the precursor under the protection of the inert gas to obtain the high-density high-conductivity LiFePO4 / C anode material. The prepared LiFePO4 / C anode material granule is spherical, has a tap density as high as 1.35-1.45g*cm<-3>, a larger specific surface area and good conductivity, and has high application value in the field of the power-type lithium ion batteries.

Description

technical field [0001] The invention relates to a preparation process of a high-density spherical lithium iron phosphate cathode material for a lithium ion battery, and belongs to the technical field of energy materials. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery, which is widely used in mobile phones, notebook computers and other fields. However, at present, lithium-ion batteries are still mainly small-capacity and low-power batteries, and medium-to-large-capacity, medium-to-high-power lithium-ion batteries have not yet been mass-produced, making lithium-ion batteries not yet widely used in the field of power batteries. The popularization and application of power batteries requires a major breakthrough in electrode materials. [0003] Cathode materials are an important part of lithium-ion batteries. The most studied positive electrode materials so far are lithium-transition metal composite oxide positive electrode ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/04C01B25/45B01J19/00H01M4/62
CPCY02E60/10
Inventor 高剑应皆荣姜长印万春荣李建军陈克勤
Owner TSINGHUA UNIV
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