Graphene-coated lithium ferric manganese phosphate cathode material and preparation method thereof

A technology of alkene-coated lithium iron manganese phosphate and positive electrode material, which is applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of low electronic conductivity and ionic conductivity, etc. , reduce the effect of erosion and dissolution

Active Publication Date: 2015-04-29
李震祺 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of low electronic conductivity and ion conductivity of lithium iron manganese phosphate positive electrode material, the present invention provides a graphene-coated lithium iron manganese phosphate positive electrode material and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Weigh 125.5045g Mn(NO 3 ) 2 4H 2 O was dissolved in 200ml deionized water, and 29.10ml H 3 PO 4 (density 1.685g / ml) was added to the manganese nitrate solution, and then 200ml of ethanol was added, stirred vigorously in a water bath at 45°C for 3 hours, and a light green precipitate formed. The resulting precipitate was suction filtered, washed three times with deionized water and ethanol, and dried at 80°C to obtain MnPO 4 ·H 2 O nano powder.

[0069] Weigh 201.9985g Fe(NO 3 ) 3 9H 2 O was dissolved in 300ml deionized water, and 74.5435g (NH 4 ) 3 PO 4 Dissolve in 100ml of deionized water, mix the two solutions in a 1000ml beaker, then add 400ml of ethanol, stir vigorously in a water bath at 45°C for 3h, a white precipitate forms. The obtained precipitate was suction filtered, then washed three times with deionized water and ethanol, and dried at 80°C to obtain FePO 4 2H 2 O nano powder.

[0070] Gradually add 10.50 g of metallic lithium flakes into a De...

Embodiment 2

[0075] PPML 4 ·H 2 Preparation of O nanopowder, FePO 4 2H 2 O nanometer powder preparation, the preparation of the metal lithium solution of 5mol / L are with embodiment 1.

[0076] 3.4956 g of graphene oxide prepared by the Brodie method was added to 200 mL of methyl ether, and ultrasonically treated at an ultrasonic frequency of 40 KHz for 2 h to obtain a graphene oxide dispersion. Weigh 18.6847g FePO according to n(Fe):n(Mn)=5:5 molar ratio 4 2H 2 O, 16.7925g MnPO 4 ·H 2 O The two kinds of nanopowders are placed in a ball milling tank, mixed in an ethanol dispersion medium using a planetary ball mill for 4 hours, dried at 120°C for 6 hours, and added to the above dispersed graphene oxide dispersion after being ground evenly. Continue ultrasonic treatment at high frequency for 3h until the dispersion is uniform. Take 50mL of 5mol / L metal lithium solution, and gradually add it dropwise into the above-mentioned uniformly dispersed mixing system under the condition of mag...

Embodiment 3

[0079] PPML 4 ·H 2 Preparation of O nanopowder, FePO 4 2H 2 O nanometer powder preparation, the preparation of the metal lithium solution of 5mol / L are with embodiment 1.

[0080] 3.4977 g of graphene oxide prepared by the Staudenmaier method was added to 200 mL of ether, and ultrasonically treated at an ultrasonic frequency of 40 KHz for 2 h to obtain a graphene oxide dispersion. Weigh 22.4216g FePO according to n(Fe):n(Mn)=6:4 molar ratio 4 2H 2 O, 13.4340g MnPO 4 ·H 2 O The two kinds of nanopowders are placed in a ball milling tank, mixed in an ethanol dispersion medium using a planetary ball mill for 4 hours, dried at 120°C for 6 hours, and added to the above dispersed graphene oxide dispersion after being ground evenly. Continue ultrasonic treatment at high frequency for 3h until the dispersion is uniform. Take 50mL of 5mol / L metal lithium solution, and gradually add it dropwise into the above-mentioned uniformly dispersed mixing system under the condition of magn...

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Abstract

The invention discloses a graphene-coated lithium ferric manganese phosphate cathode material and a preparation method thereof. A general formula of the graphene-coated lithium ferric manganese phosphate cathode material is LiFexMn<1-x>PO4 / graphene; the preparation method comprises the following steps: firstly, mechanically grinding and mixing home-made MnPO4.H2O and FePO4.2H2O nano powder evenly at a certain molar ratio; adding the mixed powder to an evenly and ultrasonically dispersed graphene oxide dispersion solvent; gradually adding a lithium metal solution to restore under the magnetic stirring condition; and adding a certain amount of lithium complexing agent after reaction is ended, stirring evenly, filtering, and washing to obtain a precursor, and carrying out high-temperature treatment at 600-800 DEG C in an inert atmosphere for 4-10 hours, so as to obtain the graphene-coated LiFexMn<1-x>PO4. The graphene-coated lithium ferric manganese phosphate cathode material disclosed by the invention has excellent electrochemical properties such as high voltage, high capacity and high cycling stability.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a graphene-coated lithium iron manganese phosphate positive electrode material and a preparation method thereof. Background technique [0002] With the development of the times and the advancement of science and technology, the application fields of lithium-ion batteries continue to expand, and gradually play an important role in daily life. With the advent of the era of electric vehicles, there has been an upsurge in research on lithium-ion batteries. LiCoO is currently the most commonly used cathode material for lithium-ion batteries 2 , LiNiO 2 and LiMn 2 o 4 None of them can meet the many requirements of electric vehicles for power batteries. LiFePO 4 The positive electrode material not only concentrates the advantages of the above three positive electrode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01B25/45H01M4/5825H01M4/625Y02E60/10
Inventor 李震祺刘立君宋翠环
Owner 李震祺
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