LiFePO4/C nano composite positive pole material and preparation method thereof

A cathode material and nanocomposite technology, which is used in electrode manufacturing, chemical instruments and methods, phosphorus compounds, etc., can solve the problems such as the inability to effectively control the particle size and distribution of the product, and the inability to achieve uniform dispersion of carbon sources, and achieve the preparation cycle. The effect of short, stable structure and pure crystal phase

Inactive Publication Date: 2008-04-09
上海微纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a ball milling process to mix the raw materials, which cannot achieve uniform dispersion of the carbon source, so the particle size and distribution of the product cannot be effectively controlled during microwave sintering

Method used

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  • LiFePO4/C nano composite positive pole material and preparation method thereof
  • LiFePO4/C nano composite positive pole material and preparation method thereof
  • LiFePO4/C nano composite positive pole material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 2.308g of lithium hydroxide monohydrate, 0.079g of high specific surface area activated carbon, and 80ml of PEG (average molecular weight: 400) into 100ml of distilled water, and fully stir for 0.5h to obtain a uniform mixture; mix 6.951g of ferrous sulfate heptahydrate and 2.859g One piece of lithium dihydrogen phosphate was dissolved in 100ml of distilled water, and stirred for 10 minutes to obtain a suspension. Under an argon atmosphere, the LiH 2 PO 4 and FeSO 4 Quickly drop the suspension of LiOH into the LiOH mixture. After the dropwise addition, age for 0.5h to obtain the precursor gel, and then perform centrifugation, wash the precipitate with deionized water several times, filter it with suction, and then heat it at 75°C 1. Drying in a vacuum oven replaced with argon for 8 hours to obtain the precursor powder. Then the dried precursor powder was pressed into tablets at 15MPa, put into a crucible filled with activated carbon, put the crucible in a microwa...

Embodiment 2

[0029] Add 4.196g lithium hydroxide monohydrate, 0.395g high specific surface area acetylene black, 79ml PEG (average molecular weight 400), 3.944g CTAB into 100ml distilled water, and fully stir for 1h to obtain a homogeneous mixture; 13.901g ferrous sulfate heptahydrate Dissolve 5.200g of lithium dihydrogen phosphate in 100ml of distilled water and stir for 15min to obtain a suspension. Under an argon atmosphere, the LiH 2 PO 4 and FeSO 4Quickly drip the suspension of LiOH into the LiOH mixture. After the dropwise addition, age for 10 minutes to obtain the precursor gel, and then perform centrifugation, wash the precipitate with deionized water several times, filter it with suction, and then store it at 70°C, Dry in a vacuum oven replaced with argon for 12 hours to obtain the precursor powder. Then the dried precursor was pressed into tablets at 20 MPa, put into a crucible with graphite powder, placed in a microwave oven, and the microwave power was controlled to 600W to ...

Embodiment 3

[0031] Add 4.196g of lithium hydroxide monohydrate, 0.1580g of high specific surface area graphite powder, and 15.776g of CTAB into 100ml of distilled water, and stir thoroughly for 1 hour to obtain a uniform mixture; mix 13.901g of ferrous sulfate heptahydrate and 5.200g of lithium dihydrogen phosphate Dissolve in 100ml distilled water and stir for 15min to obtain a suspension. Under an argon atmosphere, the LiH 2 PO 4 and FeSO 4 Quickly drip the suspension of LiOH into the LiOH mixture. After the dropwise addition, age for 15 minutes to obtain the precursor gel, and then perform centrifugation, wash the precipitate with deionized water several times, filter it with suction, and then store it at 80°C, Dry in a vacuum oven replaced with argon for 10 h to obtain precursor powder. Then the dried precursor was pressed into tablets at 25 MPa, put into a crucible with activated carbon, placed in a microwave oven, and heated at 500W for 7 minutes to obtain LiFePO 4 / C nanocompos...

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Abstract

The invention discloses a nano-composite positive material LiFePO4/C and a fabrication method, relating to a fabrication method of positive material of a lithium-ion battery. The invention uses the method of liquid-phase coprecipitation, the certain amount of lithium resource, iron resource and phosphate resource is weighted as the quality mol ratio of Li:Fe:P = (3.0-3.3):(1.0-1.1):(1.0-1.1), and the appropriate amount of carbon-doped material and organic surfactant is added in the reaction vessel; by controlling the reaction conditions like concentration, temperature etc. of the reaction solution, precursor gels are fabricated, and the precursor gels are separated, cleaned, filtered and dried to obtain precursor powder; the precursor powder is tableted and put into the crucible with microwave absorbent, and then the crucible is placed in the microwave oven, with the microwave power controlled between 100 to 600W and heated for 30 min, to obtain nano-sized composite positive material LiFePO4/C. The technique method in the invention has the advantages of short periods, saved energy consumption, ease to control the process, suitability for industrialization and so on. The composite positive material LiFePO4/C fabricated in the invention is characterized by high purity, small particle size lower than 100 nm, and good electrochemical properties.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a LiFePO4 lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Cathode materials are an important part of lithium-ion batteries, and the currently widely used cathode materials for lithium-ion batteries are layered LiCoO 2 , but due to its high cost and high toxicity, looking for alternative LiCoO 2 The requirements for cathode materials are getting stronger and stronger. LiFePO 4 Because of its high theoretical specific capacity (170mAh / g), moderate voltage platform (about 3.4V), excellent cycle performance, low price, good safety, and environmental protection, it has attracted widespread attention. It is an emerging positive electrode material for lithium-ion batteries with great development potential. However, the olivine structure of lithium iron phosphate leads to its low electrical conductivity and lithium ion mobility,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/04B01J19/00C01B25/45
CPCY02E60/12Y02E60/10Y02P20/10
Inventor 徐云龙马红彦陶丽丽
Owner 上海微纳科技有限公司
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