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Preparation method for lithium ion secondary battery positive pole active substance lithium iron phosphate

A cathode active material, lithium iron phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problem of poor high-current discharge performance of batteries, and achieve good high-current discharge performance, good uniformity, and high efficiency. High volume effect

Inactive Publication Date: 2008-07-02
海宁市盐官工业投资有限公司
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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 overcome the defect of poor high-current discharge performance of the battery prepared by using the lithium iron phosphate prepared by the prior art, and provide a method for preparing the lithium iron phosphate that makes the battery have good high-current discharge performance

Method used

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  • Preparation method for lithium ion secondary battery positive pole active substance lithium iron phosphate
  • Preparation method for lithium ion secondary battery positive pole active substance lithium iron phosphate
  • Preparation method for lithium ion secondary battery positive pole active substance lithium iron phosphate

Examples

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Embodiment 1

[0034] This embodiment illustrates the preparation of the positive electrode active material lithium iron phosphate provided by the invention

[0035] (1) Add 0.1 mole of Li 2 CO 3 , 0.2 mol FePO 4 Mix 1.2 grams of carbon black with 250 milliliters of absolute ethanol (Li: Fe: P molar ratio is 1:1:1), ball mill for 8 hours at a speed of 300 rpm in a ball mill jar, take it out, and dry it at 70°C ;

[0036] (2) Under the protection of argon with a flow rate of 10 liters / minute, the mixture in step (1) was heated to 650° C. for sintering at a constant temperature at a rate of 5° C. / minute for 6 hours, cooled to room temperature naturally, and then 2.6 glucose was added, and mixed with 150 milliliters of absolute ethanol, ball milled at a speed of 250 rpm for 6 hours in a ball mill jar, taken out, and dried at 70°C; the amount of glucose made the obtained lithium ferrous phosphate contained about 3 weight%.

[0037] (3) Under the protection of argon gas with a flow rate of 1...

Embodiment 2

[0041] This embodiment illustrates the preparation of the positive electrode active material lithium iron phosphate provided by the invention

[0042] (1) Add 0.1 mole of Li 2 CO 3 , 0.2 mol FePO 4 Mix 1.2 grams of carbon black with 250 milliliters of absolute ethanol (Li: Fe: P molar ratio is 1:1:1), ball mill for 8 hours at a speed of 300 rpm in a ball mill jar, take it out, and dry it at 70°C ;

[0043] (2) Under the protection of argon with a flow rate of 10 liters / minute, the mixture in step (1) was heated to 650° C. for sintering at a constant temperature at a rate of 5° C. / minute for 6 hours, cooled to room temperature naturally, and then 2.6 glucose was added, and stir evenly; the amount of glucose makes the carbon content in the obtained lithium iron phosphate about 3% by weight.

[0044] (3) Under the protection of argon gas with a flow rate of 10 liters / minute, the mixture in step (2) was heated to 750° C. for 10 hours at a heating rate of 10° C. / minute and sint...

Embodiment 3

[0047] This embodiment illustrates the preparation of the positive electrode active material lithium iron phosphate provided by the invention

[0048] (1) Add 0.1 mole of Li 2 CO 3 , 0.198 mol FePO 4 , 0.002 mole Mg(OH) 2 Mix 1.2 grams of carbon black with 200 milliliters of absolute ethanol (Li: Fe: Mg: P molar ratio is 1: 0.99: 0.01: 1), ball mill at a speed of 300 rpm for 12 hours in a ball mill jar, take it out, and Dry at 70°C;

[0049] (2) Under the protection of argon with a flow rate of 10 liters / minute, the mixture in step (1) was heated to 670° C. for sintering at a constant temperature at a rate of 8° C. / minute for 6 hours, cooled to room temperature naturally, and then 3.2 glucose was added, and mixed with 200 milliliters of absolute ethanol, ball milled at a speed of 200 rpm for 6 hours in a ball mill jar, taken out, and dried at 70°C; weight%.

[0050] (3) Under the protection of argon gas with a flow rate of 10 liters / minute, the mixture in step (2) was he...

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Abstract

The invention relates to a preparation method of lithium iron phosphate, an active substance applied in the anode of lithium-ion secondary batteries. The method comprises that a mixture that contains lithium compound, iron compound, phosphorus compound and carbon source additive is sintered and cooled to get a sintering product; wherein, the iron compound is ferric iron compound; the sintering method comprises the step: the mixture that contains lithium compound, iron compound, phosphorus compound and carbon source additive is sintered at a first constant sintering temperature, then a mixture of the product acquired at the first sintering temperature and the carbon source additive is sintered at a second constant sintering temperature, and the second sintering temperature is at least 80 DEG C higher than the first sintering temperature. Batteries made of the lithium iron phosphate acquired by the method of the invention have both high capacity and good discharge performance at high current.

Description

technical field [0001] The present invention relates to a preparation method of a positive electrode active material of a battery, more specifically, to 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 戴权沈菊林肖峰
Owner 海宁市盐官工业投资有限公司
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