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Preparation for polypyrole coated lithium iron phosphate

A technology for coating lithium iron phosphate and lithium iron phosphate, which is applied in the field of composite material preparation, can solve problems such as high temperature cycle stability of lithium iron phosphate, etc. Good electrical conductivity and electrochemical performance, achieving the effect of industrial scale production

Active Publication Date: 2009-07-08
SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of polypyrrole (PPy) in the lithium iron phosphate / polypyrrole composite materials reported above is all above 10wt%, and their research did not involve the influence of polypyrrole coating on the high-temperature cycle stability of lithium iron phosphate

Method used

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  • Preparation for polypyrole coated lithium iron phosphate
  • Preparation for polypyrole coated lithium iron phosphate
  • Preparation for polypyrole coated lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 4 grams of iron p-toluenesulfonate hexahydrate and dissolve it in 16 grams of ethanol, then add 2 grams of lithium iron phosphate powder (LiFePO 4 / C, containing 2.4wt% C), ultrasonically dispersed in it, and placed in an ice bath, the temperature was controlled at about 0°C to 4°C, 0.17 g of pyridoxine monomer was added dropwise in the stirring state, and the stirring was continued for 30 minutes to make the pyridoxine The polypyrrone monomer is fully polymerized; the reacted product is centrifuged, washed several times with ethanol, dried, ground and sieved to obtain polypyrrole-coated lithium iron phosphate (PPy-LiFePO 4 / C, containing 5 wt% PPy, 2.4 wt% C).

[0016] Weigh 0.45 g of the prepared PPy-LiFePO 4 / C powder, add 0.09 gram of carbon black and 0.06 gram of polyvinylidene fluoride binder dissolved in N-N' dimethylpyrrolidone, mix evenly and apply it on the aluminum foil to make a positive electrode sheet. In an argon atmosphere drying glove box, with ...

Embodiment 2

[0019] Weigh 1.5 grams of iron p-toluenesulfonate hexahydrate and dissolve it in 4.5 grams of n-butanol, then add 1 gram of lithium iron phosphate powder LiFe containing trace manganese 0.98 mn 0.02 PO 4 / C (containing 2.7wt% C) was ultrasonically dispersed in it, and placed in an ice bath, the temperature was controlled at about 0°C to 4°C, 0.06 g of pyridoxine monomer was added dropwise in the stirring state, and the stirring was continued for 30 minutes to make the pyridoxine The monomer is fully polymerized. The reacted product was centrifuged, washed several times with ethanol, dried, ground and sieved to obtain polypyrone-coated lithium iron phosphate PPy-LiFe 0.98 mn 0.02 PO 4 / C (containing 2.7wt% C, 3wt% PPy).

[0020] The resulting PPy-LiFe 0.98 mn 0.02 PO 4 / C (containing 2.7wt%C, 3wt%PPy) composite material and LiFe before coating 0.98 mn 0.02 PO 4 / C material is prepared into a battery by the same method as in Example 1 and is compared with high-rate di...

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Abstract

The invention discloses a preparation method of polypyrrole-coated lithium iron phosphate. The preparation method comprises the following steps: dissolving iron(III) p-toluenesulfonate hexahydrate in alcohol; ultrasonically dispersing lithium iron phosphate powder in the alcohol; placing into a sealed container; adding pyrrole monomers under low-temperature stirring condition; stirring for a period of time, so that the pyrrole monomers generate polymerization reaction on the surface of lithium iron phosphate; filtering; washing; drying; grinding; and sieving to obtain polypyrrole-coated lithium iron phosphate. The polypyrrole-coated lithium iron phosphate prepared by the method can be assembled with lithium tabs to form a test battery, which has an reversible capacity of 115 mAh / g during charge / discharge at 20C rate and an initial specific capacity of 155 mAh / g during charge / discharge cycle at 55 DEG C and 5C rate and can keep the specific capacity at 90% the initial value after 300 cycles. Accordingly, the test battery exhibits excellent high-rate charge / discharge capability and good high-temperature cycle stability. The method is simple and feasible, and suits large-scale industrial production.

Description

Technical field: [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of polypyrone-coated lithium iron phosphate, which is applied to a lithium ion battery as a positive electrode material. Background technique: [0002] As the latest generation of secondary batteries, lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long service life, no memory effect, no pollution, and low self-discharge rate. They have been widely used in mobile phones, notebook computers, video cameras, and digital cameras. , and portable measuring instruments and many other civilian and military fields. In recent years, domestic and foreign countries are also competing to develop large-capacity lithium-ion secondary batteries for applications in electric vehicles, aerospace, and energy storage. [0003] The rapid development of lithium-ion batteries depends on the development of new energy materi...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/66
CPCY02E60/12Y02E60/10
Inventor 马紫峰廖小珍杨扬何雨石龚强
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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