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Method for preparing conducting film LiFePO4 cladding material containing nitrogen

A conductive carbon film and coating technology, applied to chemical instruments and methods, circuits, electrical components, etc., to achieve the effects of controlling reaction temperature and reaction time, improving life expectancy, and stabilizing structure

Inactive Publication Date: 2012-09-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using polyacrylonitrile as raw material to conduct temperature-controlled microwave heating to synthesize LiFePO4 material coated with nitrogen-containing conductive carbon film has no successful precedent, and there is no LiFePO coated with nitrogen-containing conductive carbon film. Reporting of >4materials

Method used

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  • Method for preparing conducting film LiFePO4 cladding material containing nitrogen
  • Method for preparing conducting film LiFePO4 cladding material containing nitrogen
  • Method for preparing conducting film LiFePO4 cladding material containing nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment one: Paste preparation

[0039] Take 222.9 grams of FePO with a purity of 99.99% 4 4H 2 O with 99.99% pure LiOH H 2 O. The polyacrylonitrile emulsion (40 wt %) was placed in a ball mill tank at 800 rpm for 10 minutes at a mass ratio of 9.31:1:5 to prepare a paste.

Embodiment 2

[0040] Embodiment two: paste dehydration

[0041] Take 222.9 grams of FePO with a purity of 99.99% 4 4H 2 O with 99.99% pure LiOH H 2 O and polyacrylonitrile emulsion (40wt%) were placed in a ball mill tank with a mass ratio of 9.31: 1: 15 and mixed for 20 minutes at a speed of 600 rpm to make a paste, put it into a quartz reactor, and adjust the microwave output power to 1KW , so that the temperature of the reactants was controlled at 150°C. FePO 4 4H 2 O and LiOHH 2 Emulsion polymerization and dehydration of O and polyacrylonitrile to form spherical FePO coated with polyacrylonitrile membrane 4 and LiOH mixture. FePO 4 And the particle size of LiOH is less than 100nm.

Embodiment 3

[0042] Example 3: Formation prototype of carbonized film

[0043] Take 222.9 grams of FePO with a purity of 99.99% 4 4H 2 O with 99.99% pure LiOH H 2 O and polyacrylonitrile emulsion (40wt%) were placed in a ball mill tank with a mass ratio of 9.31: 1: 20 and mixed for 30 minutes at a speed of 200 rpm to make a paste and put it into a quartz reactor. Adjust the microwave output power to 1KW , so that the temperature of the reactants was controlled at 150°C. FePO 4 4H 2 O and LiOHH 2 Emulsion polymerization and dehydration of O and polyacrylonitrile to form FePO coated with polyacrylonitrile membrane 4 and LiOH mixture. Oxygen was introduced into the reactor at a rate of 10mL / min, and the microwave output power was increased to control the temperature rise of the reactant at 1°C / min from 150°C to 300°C. 4 The cyclization reaction and stabilization process of the polyacrylonitrile film occur on the LiOH mixture particles, forming an incomplete carbonized film.

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Abstract

The invention relates to a preparation method of a lithium ion battery anode material, aiming to provide a method for preparing a conducting film LiFePO4 cladding material containing nitrogen. The method comprises the following steps of: ball milling and mixing FePO4.4H2O, LiOH.H2O and a polyacrylonitrile emulsion, blending into a paste and putting the paste into a quartz reactor; regulating and controlling the microwave output power and controlling the reaction temperature to be at 150 DEG C; raising the microwave output power in an oxygen atmosphere and heating up to 300 DEG C from 150 DEG C; switching to a highly pure nitrogen atmosphere, raising the microwave output power and heating up to 600 DEG C from 300 DEG C; and continuously raising the microwave output power under the highly pure nitrogen atmosphere and annealing at 700-800 DEG C for denitrifying. Nitrogen atoms remain on the conducting carbon film formed by the invention, and lone pair electrons of the nitrogen atoms can effectively improve the conductivity of the carbon film so as to improve electrochemical and dynamic properties of the anode, reduce the electrode polarization and improve the velocity volume of the lithium cell, thus the invention can be applied to power cells of electric vehicles.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a nitrogen-containing conductive polymer coated LiFePO 4 Material, using temperature-controlled microwave reaction to prepare LiFePO coated with nitrogen-containing conductive carbon film 4 Methods. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. Lithium-ion batteries are currently due to the use of LiCoO 2 As a cathode material, it is relatively expensive. [0003] Since 1997, Padhi e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397C01B25/45
CPCY02E60/122Y02E60/10
Inventor 李洲鹏刘宾虹
Owner ZHEJIANG UNIV
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