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Preparation method for lithium ion secondary battery anode material ferric lithium phosphate

A lithium iron phosphate and secondary battery technology, applied in the field of battery cathode material preparation, can solve problems such as poor high current discharge performance of batteries, and achieve the effects of excellent high current discharge performance, excellent electrical conductivity, and improved electrical conductivity

Inactive Publication Date: 2009-07-29
广西荷美新能源车辆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 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 anode material ferric lithium phosphate
  • Preparation method for lithium ion secondary battery anode material ferric lithium phosphate
  • Preparation method for lithium ion secondary battery anode material ferric lithium phosphate

Examples

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Embodiment 1

[0032] This embodiment illustrates the preparation of the positive electrode active material lithium iron phosphate provided by the present invention

[0033] (1) 50 moles of Li 2 CO 3 , 100 moles of FeC2 o 4 2H 2 O, 50 moles of NH 4 h 2 PO 4 Mix with 438.6g glucose and 10kg dehydrated ethanol (Li: Fe: P molar ratio is 1: 1: 1), ball milled 12 hours with the speed of 300 rev / mins in ball mill tank, take out, dry at 70 ℃; Under the protection of argon with a flow rate of 10 liters / min, the mixture in step (1) was heated to 450° C. for 6 hours at a heating rate of 2° C. / min and sintered at a constant temperature to obtain a sintered precursor;

[0034] (2) Naturally cool the sintered precursor to room temperature, then add 584.28g of polyvinyl alcohol, mix it with 5kg of absolute ethanol, mill it in a ball mill jar at a speed of 150 rpm for 1 hour, take it out, and dry it at 70°C ; Under the protection of argon with a flow rate of 10 liters / min, the mixture was heated to ...

Embodiment 2

[0038] This embodiment illustrates the preparation of the positive electrode active material lithium iron phosphate provided by the present invention

[0039] Prepare lithium iron phosphate according to the method of Example 1, the difference is that the organic small molecule carbon source additive in step (1) is changed to sucrose; the organic high molecular polymer carbon source additive is changed into polyethylene glycol in step (2). Alcohol, other steps, each material consumption ratio and condition are the same as embodiment 1.

[0040] Pass the finished lithium iron phosphate composite material obtained above through a 200-mesh sieve, and measure its median diameter D 50 2.5 µm, D 95 It is 6.5 microns and the tap density is 1.17 g / ml.

Embodiment 3

[0042] This embodiment illustrates the preparation of the positive electrode active material lithium iron phosphate provided by the present invention

[0043] Prepare lithium iron phosphate according to the method of embodiment 1, difference is, the addition amount of organic small molecule carbon source additive glucose in step (1) is changed into 217.7g; In step (2), organic polymer carbon source additive polyethylene The addition amount of alcohol is changed into 1841.9g, and other steps, each material consumption ratio and condition are the same as embodiment 1.

[0044] The lithium iron phosphate composite material obtained above is passed through a 200 mesh sieve, and its median particle diameter D is measured. 50 2.5 µm, D 95 It is 6.8 microns and the tap density is 1.06 g / ml.

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Abstract

A method for preparing lithium iron phosphate which is a cathode material of lithium ion secondary battery, the method comprises the following procedures: A. a lithium source compound, a bivalence iron source compound, a phosphorus source compound and a small organic molecular carbon source additive are mixed, ball ground and sintered to obtain a sintering precursor; and B. the sintering precursor which is obtained from the procedure A and an organic high molecular polymer carbon source additive are mixed, ball ground, sintered and crushed to obtain the lithium iron phosphate power of finished products. In the method, the carbon source is added into the precursor in two steps: adding the organic small organic molecular carbon source first and then adding the organic high molecular polymer carbon source, thus obtaining a lithium iron phosphate carbon with good packing effect. The large current discharge performance of the battery made of the lithium iron phosphate is obviously raised.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a battery, more specifically, to a preparation method of lithium iron phosphate, a positive electrode 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. . Lithium iron phosphate (LiFePO 4 ) 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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IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45C01D15/00
CPCY02E60/12Y02E60/10
Inventor 钟北军荣强曹文玉姜占锋
Owner 广西荷美新能源车辆科技有限公司
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