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Preparing method of anode active material lithium iron phosphate for lithium ionic secondary cell

A positive active material and secondary battery technology, applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of poor high-current charge and discharge performance, low volume specific capacity of lithium iron phosphate, etc.

Active Publication Date: 2009-04-01
TAICANG RONGCHI MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the low volume specific capacity of lithium iron phosphate obtained in the existing methods for preparing lithium iron phosphate materials and the poor high-current charge and discharge performance of lithium ion batteries made using the lithium iron phosphate , providing a method for preparing lithium iron phosphate with high volume specific capacity and good high-current charge and discharge performance of lithium ion batteries prepared using the lithium iron phosphate

Method used

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  • Preparing method of anode active material lithium iron phosphate for lithium ionic secondary cell
  • Preparing method of anode active material lithium iron phosphate for lithium ionic secondary cell
  • Preparing method of anode active material lithium iron phosphate for lithium ionic secondary cell

Examples

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Embodiment 1

[0030] This embodiment illustrates the preparation method of positive electrode active material lithium iron phosphate provided by the present invention

[0031] (1) 185 grams of Li 2 CO 3 , 720 grams of ferrous oxalate, 575 grams of NH 4 h 2 PO 4 1. Mix 150 grams of glucose with 2000 milliliters of absolute ethanol (the molar ratio of Li:Fe:P is 1:1:1), mill on a planetary ball mill for 24 hours, take it out and dry it at 70°C;

[0032] (2) Under the protection of argon, the temperature is raised to 500°C at a rate of 2°C / min, and the mixture in step (1) is sintered for the first time, and the sintering time is 4 hours;

[0033] (3) Cool naturally to 200°C, feed air, and heat for 2 hours; then, cool to room temperature;

[0034] (4) Add 1000 ml of dehydrated ethanol to the mixture in step (3), mill it on a planetary ball mill for 1.5 hours, take it out and dry it at 70°C;

[0035] (5) Under the protection of argon, the temperature was raised to 750°C at a rate of 10°C / m...

Embodiment 2

[0039] This embodiment illustrates the preparation method of positive electrode active material lithium iron phosphate provided by the present invention

[0040] (1) 520 g of LiH 2 PO 4 , 720 grams of ferrous oxalate, 745 grams (NH 4 ) 3 PO 4 1. Mix 90 grams of acetylene black with 2000 milliliters of absolute ethanol (the molar ratio of Li:Fe:P is 1:1:1), mill it on a planetary ball mill for 35 hours, take it out and dry it at 70°C;

[0041] (2) Under the protection of argon, the temperature is raised to 350°C at a rate of 2°C / min, and the mixture in step (1) is sintered for the first time, and the sintering time is 8 hours;

[0042] (3) Cool naturally to 150°C, feed air, and heat for 5 hours; then, cool to room temperature;

[0043] (4) Add 1000 ml of absolute ethanol to the mixture in step (3), mill it on a planetary ball mill for 1 hour, take it out and dry it at 70°C;

[0044] (5) Under the protection of argon, the temperature was raised to 850°C at a rate of 10°C / m...

Embodiment 3

[0046] This embodiment illustrates the preparation method of positive electrode active material lithium iron phosphate provided by the present invention

[0047] (1) 520 g of LiH 2 PO 4 , 574 grams of ferrous oxalate, 745 grams (NH 4 ) 3 PO 4 , 150 grams of CaCO 3 1. Mix 30 grams of natural graphite with 2000 milliliters of absolute ethanol (Li: Ca: Fe: P molar ratio is 1: 0.3: 0.7: 1), ball mill on a planetary ball mill for 30 hours, take it out and dry it at 70 ° C;

[0048] (2) Under the protection of argon, the temperature is raised to 450°C at a rate of 2°C / min, and the mixture in step (1) is sintered for the first time, and the sintering time is 7 hours;

[0049] (3) Cool naturally to 100°C, feed air, and heat for 8 hours; then, cool to room temperature;

[0050] (4) Add 1000 ml of absolute ethanol to the mixture in step (3), mill it on a planetary ball mill for 1 hour, take it out and dry it at 70°C;

[0051] (5) Under the protection of argon, the temperature was...

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Abstract

The invention provides a preparation method of lithium iron phosphate of a lithium-ion secondary battery positive electrode active material, the method comprises: a ferrous source compound, a phosphorus source compound, a lithium source compound and a carbon source compound are mixed, the first sintering is carried out on the obtained mixture under the protection atmosphere, products in the first sintering are ball-milled and dried, the second sintering is further carried out to obtain the lithium iron phosphate, wherein, the method further comprises the heating of the mixture at the temperature of 60-250 DEG C under the oxidation atmosphere before the first sintering or after the first sintering. The lithium iron phosphate which is obtained by adopting the method can have both high volume specific capacity and excellent high-current discharge performance.

Description

technical field [0001] The present invention relates to a preparation method of a positive electrode active material of a battery, more specifically, a preparation method of lithium iron phosphate, a positive electrode active material of a lithium ion secondary battery. Background technique [0002] As a high-energy chemical power source, lithium-ion batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. . LiFePO 4 It is a research hotspot of positive electrode active materials for lithium-ion batteries. LiFePO 4 As a positive electrode active material for lithium-ion batteries, compared with other batteries, it has good electrochemical performance, the charging and discharging platform is very stable, and the structure is stable during charging and discharging. The advantages of use and wide range of raw material sources are currently hot spots in the battery industry's development and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45H01M4/587
CPCH01M4/587H01M4/5825Y02E60/10H01M4/36H01M4/48H01M4/583H01M10/0525
Inventor 戴权沈菊林
Owner TAICANG RONGCHI MOTOR
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