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Method for synthesizing lithium iron phosphate material by adopting electrostatic spinning

A technology of lithium iron phosphate and electrospinning, which is applied in the direction of spinning solution preparation, filament/wire forming, circuit, etc., can solve the problem of large particle size, achieve the effect of increasing mass specific capacity and improving performance

Inactive Publication Date: 2012-03-28
长春劲能科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size is still relatively large

Method used

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  • Method for synthesizing lithium iron phosphate material by adopting electrostatic spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] FeC 2 o 4 , LiH 2 PO 4 Add it to an aqueous polyvinyl alcohol solution with a mass ratio concentration of 4%, and mix at 25° C. for 1 hour. Among them Li + : Fe 2+ :PO 4 3- The molar ratio of FeC is 0.9:1:1; FeC 2 o 4 , LiH 2 PO 4 The total mass is 0.1 g, and the mass of the polyvinyl alcohol aqueous solution is 40 g. After stirring, a spinning dope was prepared. The prepared electrospinning stock solution was added into the syringe, and the spinning voltage was set to 5KV; the solidification distance was 3cm; the feeding speed of the solution was controlled to be 10mL / h. The one-dimensional nanowire precursor of lithium iron phosphate was prepared in this way. After drying the prepared lithium iron phosphate precursor at 50 °C, place it under N 2 Calcined at 550° C. for 24 hours in an atmosphere protection furnace, and cooled naturally to room temperature to prepare a one-dimensional nanostructured lithium iron phosphate material.

Embodiment 2

[0025] FeC 2 o 4 , Li 2 CO 3 , NH4 h 2 PO 4 Add it into a polyvinyl alcohol ethanol solution with a mass ratio concentration of 50%, and mix at 50° C. for 24 hours. Among them Li + : Fe 2+ :PO 4 3- The molar ratio of FeC is 1:1:1; FeC 2 o 4 , Li 2 CO 3 , NH 4 h 2 PO 4 The total mass is 10g, and the mass of the polyvinyl alcohol ethanol solution is 1g. After stirring, a spinning dope was prepared. The prepared electrospinning stock solution was added into the syringe, and the spinning voltage was set to 30KV; the solidification distance was 25cm; the feeding speed of the solution was controlled to be 0.01mL / h. The lithium iron phosphate precursor was thus prepared. The prepared lithium iron phosphate precursor was dried at 80°C, placed in an Ar atmosphere protection furnace, calcined at 850°C for 1 hour, and naturally cooled to room temperature to prepare a one-dimensional nanostructured lithium iron phosphate material.

[0026] The synthesized lithium ferrou...

Embodiment 3

[0028] Will Fe 2 o 3 , Li 2 HPO 4 Add it into an ethylene glycol solution with a mass fraction of 15% polyvinylpyrrolidone, and mix at 80° C. for 12 hours. Among them Li + : Fe 2+ :PO 4 3- The molar ratio of Fe is 1.1:1:1; Fe 2 o 3 , Li 2 HPO 4 The total mass is 5g, and the mass of the polyvinyl alcohol aqueous solution is 50g. After stirring, the electrospinning stock solution was prepared. The prepared electrospinning stock solution was added into the syringe, and the spinning voltage was set to 10KV; the solidification distance was 6cm; the feeding speed of the solution was controlled to be 5mL / h. The lithium iron phosphate precursor was thus prepared. After the prepared lithium iron phosphate precursor was dried at 75 °C, it was placed in H 2 Calcined at 600° C. for 23 hours in an atmosphere protection furnace, and cooled naturally to room temperature to prepare nanostructured lithium iron phosphate.

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Abstract

The invention belongs to a method for synthesizing a lithium iron phosphate material by adopting electrostatic spinning. The selected compounds comprise an iron source compound which is selected from one or a mixture of two of FeC2O4, Fe2O3 and FePO4, a lithium source compound which is selected from one or a mixture of two of LiH2PO4, Li2CO3, Li2HPO4 and LiOH, a phosphate radical containing compound which is selected from one or a mixture of two of LiH2PO4, (NH4)2HPO4, NH4H2PO4 and H3PO4, a polymer which is selected from one or two of polyvinyl alcohol, polyacrylonitrile and polyvinylpyrrolidone, and a solvent used by polymer solution which is selected from one or a mixture of more than two of water, ethanol, glycol, acetic acid and isopropanol. The lithium iron phosphate in a nano structure is prepared by preparing spinning solution, preparing a lithium iron phosphate precursor and drying and calcining the lithium iron phosphate precursor. The method has the following beneficial effects: the high-rate charge / discharge performance of the lithium iron phosphate and the specific capacity of charge / discharge under low temperature are improved; and the new method is provided for synthesizing lithium iron phosphate.

Description

technical field [0001] The invention belongs to a method for synthesizing lithium iron phosphate material by electrospinning. technical background [0002] Lithium-ion batteries are ideal energy storage devices. It has the advantages of no pollution, long service life, and no memory effect. Widely used in various electronic equipment. In recent years, with the gradual reduction of fossil-grade energy such as coal and petroleum, and the enhancement of people's awareness of environmental protection, lithium-ion batteries have also achieved tremendous development in the field of electric vehicles. [0003] Lithium-ion batteries usually consist of the following parts: positive electrode, negative electrode, separator, electrolyte, current collector, and casing. Among them, the positive electrode plays an important role in the battery. The positive electrode of traditional commercial batteries is usually lithium cobalt oxide, which has the advantages of good cycle performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01D1/02H01M4/58
CPCY02E60/12Y02E60/10
Inventor 谢海明王荣顺王钊李明娟
Owner 长春劲能科技集团有限公司
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