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Preparation method of lithium iron phosphate·lithium vanadium phosphate/carbon in-situ composite cathode material

A positive electrode material and in-situ recombination technology, applied in phosphorus compounds, chemical instruments and methods, battery electrodes, etc., can solve problems such as low electronic conductivity and ion diffusion rate

Inactive Publication Date: 2017-03-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the existing LiFePO 4 · Li 3 V 2 (PO 4 ) 3 The problem of low electronic conductivity and ion diffusion rate of / C composite material, the present invention provides a LiFePO with superlattice structure and excellent electrochemical performance 4 · Li 3 V 2 (PO 4 ) 3 Bioprecipitation-solid-phase synthesis method of / C composites

Method used

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  • Preparation method of lithium iron phosphate·lithium vanadium phosphate/carbon in-situ composite cathode material
  • Preparation method of lithium iron phosphate·lithium vanadium phosphate/carbon in-situ composite cathode material
  • Preparation method of lithium iron phosphate·lithium vanadium phosphate/carbon in-situ composite cathode material

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Embodiment 1

[0045] A kind of LiFePO 4 ·Li 3 V 2 (PO 4 ) 3 / C in-situ composite cathode material preparation method, the steps are as follows:

[0046] (1) Dissolve ferric chloride in deionized water to prepare a ferric ion solution with a molar concentration of 0.5 mol / L and record it as solution A;

[0047] Ammonium metavanadate was added to the 0.3mol / L oxalic acid solution, heated and stirred at 70°C and 250r / min for 1 hour to prepare a vanadium ion solution with a molar concentration of 0.5mol / L, which was recorded as solution B;

[0048] Put 2g of activated yeast in 5ml of deionized water to prepare a yeast suspension with a mass concentration of 40%, which is recorded as solution C;

[0049] The activated yeast is prepared by the following method:

[0050] Inoculate high-active dry yeast into a glucose solution with a mass concentration of 4% at a mass ratio of 2%, activate and cultivate at 35°C for 0.5h, filter the precipitate, and wash the precipitate twice to obtain the activated yeast;

[...

Embodiment 2

[0057] A kind of LiFePO 4 ·Li 3 V 2 (PO 4 ) 3 / C in-situ composite cathode material preparation method, the steps are as follows:

[0058] (1) Dissolve ferric chloride in deionized water to prepare an iron ion solution with a molar concentration of 0.8 mol / L, and record it as solution A;

[0059] Ammonium metavanadate was added to 0.4mol / L oxalic acid solution, heated and stirred at 70°C and 200r / min for 1.5h to prepare a vanadium ion solution with a molar concentration of 0.8mol / L, which was recorded as solution B;

[0060] Place 1g of activated yeast in 5ml of deionized water to prepare a yeast suspension with a mass concentration of 20%, which is recorded as solution C;

[0061] The activated yeast is prepared by the following method:

[0062] Inoculate the highly active dry yeast in a glucose solution with a mass concentration of 2% at a mass ratio of 1%, activate and cultivate at 30°C for 1 hour, filter the precipitate, and wash the precipitate 3 times to obtain the activated yeast...

Embodiment 3

[0069] A LiFePO 4 ·Li 3 V 2 (PO 4 ) 3 / C in-situ composite cathode material preparation method, the steps are as follows:

[0070] (1) Dissolve ferric chloride in deionized water to prepare a ferric ion solution with a molar concentration of 0.3 mol / L and record it as solution A;

[0071] Ammonium metavanadate was added to the 0.5mol / L oxalic acid solution, heated and stirred at 70°C and 300r / min for 2h to prepare a vanadium ion solution with a molar concentration of 0.3mol / L, which was recorded as solution B;

[0072] Place 1.5g of activated yeast in 5ml of deionized water to prepare a yeast suspension with a mass concentration of 30%, which is recorded as solution C;

[0073] The activated yeast is prepared by the following method:

[0074] Inoculate high-active dry yeast in a glucose solution with a mass concentration of 3% at a mass ratio of 1.5%, activate and cultivate at 37°C for 0.5h, filter the precipitate, and wash the precipitate twice to obtain the activated yeast;

[0075] (2...

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Abstract

The invention relates to a preparation method of a lithium iron phosphate. lithium vanadium phosphate / carbon (LiFePO4.Li3V2(PO4)3 / C) in-situ composite positive pole material. The preparation method comprises the following steps of mixing an iron source, a vanadium source, a phosphorus source and a yeast cell solution so that ions or ionic groups are adsorbed and deposited on yeast cells and ferric phosphate or vanadyl phosphate and ferric phosphate precursors are formed, mechanically mixing a vanadium source, a lithium source, a phosphorus source and a carbon source, and carrying out heat treatment under the action of a yeast cell superlattice structure template, a conductive carbon source and a nano-particle binder to obtain the LiFePO4.Li3V2(PO4)3 / C in-situ composite positive pole material with a superlattice structure and excellent electrochemical performances. The LiFePO4.Li3V2(PO4)3 / C in-situ composite positive pole material can be used for preparation of a portable and large-power power lithium-ion battery.

Description

Technical field [0001] The invention relates to a lithium iron phosphate lithium vanadium phosphate / carbon (LiFePO 4 ·Li 3 V 2 (PO 4 ) 3 / C) A preparation method of an in-situ composite cathode material belongs to the technical field of functional materials. Background technique [0002] Olivine structure lithium iron phosphate (LiFePO 4 ) And monoclinic lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) Are two kinds of lithium-ion battery cathode materials with important application value. They have attracted much attention because of their stable structure, excellent cycle performance, good safety performance, abundant resources, low cost, and suitable for high-power power batteries. While Li 3 V 2 (PO 4 ) 3 Theoretical specific capacity (197mAh g -1 ) Than LiFePO 4 (170mAh g -1 ), and there are three lithium ions that can be freely inserted and extracted to make the charging voltage close to 5V, which is higher than that of LiFePO 4 High specific capacity, voltage platform, cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58C01B25/45H01M4/62
CPCC01B25/45H01M4/364H01M4/5805H01M4/62H01M10/0525Y02E60/10
Inventor 何文张旭东金超
Owner QILU UNIV OF TECH
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