Fluorine-doped carbon-coated positive electrode composite material and preparation method and application thereof

A technology of composite material and positive electrode material, which is applied in the field of fluorine-doped carbon-coated positive electrode composite material and its preparation, can solve the problems of inability to prevent electrolyte, low conductivity, poor uniformity and the like

Active Publication Date: 2016-08-24
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the carbon material coated on the surface of the material has poor unifo...

Method used

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  • Fluorine-doped carbon-coated positive electrode composite material and preparation method and application thereof
  • Fluorine-doped carbon-coated positive electrode composite material and preparation method and application thereof
  • Fluorine-doped carbon-coated positive electrode composite material and preparation method and application thereof

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Experimental program
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Embodiment 1

[0037] Water and diethylene glycol are configured as a mixed solvent in a ratio of 1:2. A stoichiometric lithium salt and a stoichiometric phosphorus source were added to a mixed solvent of water and alcohol, and stirred for 30 minutes to form a suspension A. Add stoichiometric ratio of ferrous salt, stoichiometric ratio of divalent manganese salt and 0.2 g of ascorbic acid into the mixed solvent of water and alcohol, and stir for 10 minutes to form solution B. Solution B was added dropwise to suspension A shown, and stirred for 10 min to form suspension C. Wherein Li:Mn:Fe:P:=3:0.75:0.25:1. The suspension C was transferred to the reaction kettle, and the solvothermal reaction was carried out at 200 ° C for 12 hours to obtain lithium manganese iron phosphate (LiMn 0.75 Fe 0.25 PO 4 ) precursor slurry. The lithium manganese iron phosphate slurry was naturally cooled to room temperature, and washed alternately with water and ethanol three times. The washed product was plac...

Embodiment 2

[0041] Water and diethylene glycol are configured as a mixed solvent in a ratio of 1:2. A stoichiometric lithium salt and a stoichiometric phosphorus source were added to a mixed solvent of water and alcohol, and stirred for 30 minutes to form a suspension A. Add stoichiometric ratio of ferrous salt, stoichiometric ratio of divalent manganese salt and 0.2 g of ascorbic acid into the mixed solvent of water and alcohol, and stir for 10 minutes to form solution B. Solution B was added dropwise to suspension A shown, and stirred for 10 min to form suspension C. Wherein Li:Mn:Fe:P:=3:0.75:0.25:1. The suspension C was transferred to the reaction kettle, and the solvothermal reaction was carried out at 200 ° C for 12 hours to obtain lithium manganese iron phosphate (LiMn 0.75 Fe 0.25 PO 4 ) precursor slurry. The lithium manganese iron phosphate slurry was naturally cooled to room temperature, and washed alternately with water and ethanol three times. The washed product was plac...

Embodiment 3

[0044] Water and diethylene glycol are configured as a mixed solvent in a ratio of 1:2. A stoichiometric lithium salt and a stoichiometric phosphorus source were added to a mixed solvent of water and alcohol, and stirred for 30 minutes to form a suspension A. Add stoichiometric ratio of ferrous salt, stoichiometric ratio of divalent manganese salt and 0.2 g of ascorbic acid into the mixed solvent of water and alcohol, and stir for 10 minutes to form solution B. Solution B was added dropwise to suspension A shown, and stirred for 10 min to form suspension C. Wherein Li:Mn:Fe:P:=3:0.75:0.25:1. The suspension C was transferred to the reaction kettle, and the solvothermal reaction was carried out at 200 ° C for 12 hours to obtain lithium manganese iron phosphate (LiMn 0.75 Fe 0.25 PO 4 ) precursor slurry. The lithium manganese iron phosphate slurry was naturally cooled to room temperature, and washed alternately with water and ethanol three times. The washed product was plac...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and particularly relates to a fluorine-doped carbon-coated positive electrode composite material and a preparation method and an application thereof. The method comprises the following steps: with a lithium source, a manganese source and/or an iron source and a phosphorus source as materials, obtaining a positive electrode material LiMn<1-x>Fe<x>PO<4> (x=0-1) by a solvothermal method or a solid phase method; and mixing the obtained positive electrode material with a fluorine-containing material and carrying out high-temperature carbonization under inert gas protection to obtain the fluorine-doped carbon-coated positive electrode composite material. According to the fluorine-doped carbon-coated positive electrode composite material, the electron conduction velocity can be accelerated by fluorine-doped carbon; corrosion of an electrolyte to the material LiMn<1-x>Fe<x>PO<4> (x=0-1) is reduced; and the prepared positive electrode material has high reversible specific capacity, good rate capability, excellent cycle performance and high energy density. The technology is simple; the repeatability is good; and the prepared high-performance positive electrode material is suitable for the field of application of lithium-ion power batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a fluorine-doped carbon-coated cathode composite material, a preparation method and application thereof. Background technique [0002] Lithium-ion battery is a recyclable, efficient and clean new energy source, and an effective technical approach to comprehensively alleviate energy, resource and environmental problems. At present, lithium-ion batteries have become the dominant energy source for portable home appliances. However, with the continuous improvement of the performance of various electronic products, especially the rapid development of electric vehicles and large-scale energy storage technology in recent years, the capacity, life, and The performance of power, safety and cost has put forward higher and higher requirements, and the development of high-performance cathode materials around the above requirements is one of the main tasks of lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 金永成闫霄孙德业
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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