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Graphene composite carbon-coated cobalt-lithium phosphate material and preparation methods and application thereof

A carbon-coated lithium cobalt phosphate and graphene composite technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problem of reducing the energy density of lithium cobalt phosphate batteries, reducing the tap density of lithium cobalt phosphate materials, reducing Active material content and other issues, to achieve the effect of improving electrochemical performance, improving electrochemical performance, and convenient process control

Active Publication Date: 2016-05-11
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these approaches improve the electrochemical performance of materials to a certain extent, they generally require higher carbon content (>20%) to obtain better performance.
Excessive carbon content will greatly reduce the tap density of lithium cobalt phosphate materials and reduce the content of active materials, thereby significantly reducing the energy density of lithium cobalt phosphate batteries and weakening the advantages of lithium cobalt phosphate materials

Method used

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  • Graphene composite carbon-coated cobalt-lithium phosphate material and preparation methods and application thereof
  • Graphene composite carbon-coated cobalt-lithium phosphate material and preparation methods and application thereof
  • Graphene composite carbon-coated cobalt-lithium phosphate material and preparation methods and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh LiF according to the stoichiometric ratio, Co(NO 3 ) 2 ·6H 2 O, H 3 PO 4 Each 0.04mol was dissolved in 500mL water, stirred at 80°C for 2h to obtain a clear solution, and spray-dried at 180°C to obtain cobalt lithium phosphate precursor powder. After the obtained cobalt lithium phosphate precursor is fully mixed with 3% graphene (0.19g) by weight ratio of theoretical cobalt lithium phosphate and sucrose (0.458g) corresponding to 3% carbon residue, ethyl alcohol is used as a solvent for 500r / min ball milling After 6 hours of mixing evenly, the resulting mixture was dried and pressed into tablets, then calcined at 550° C. for 6 hours under the protection of an argon atmosphere, and then cooled to room temperature to obtain a graphene-composite carbon-coated cobalt phosphate material.

[0032] figure 1 It is the X-ray diffraction (XRD) pattern of the obtained graphene composite carbon-coated cobalt phosphate material. Depend on figure 1 It can be seen that the...

Embodiment 2

[0035] Weigh LiF according to the stoichiometric ratio, Co(NO 3 ) 2 ·6H 2 O, H 3 PO 4 Each 0.04mol and a certain amount of sucrose (0.458g) were dissolved in 300mL of water, stirred at 80°C for 2h to obtain a clear solution (solution A); weigh 3% graphene (0.19g) according to the theoretical weight ratio of lithium cobalt phosphate and disperse it in In 200mL of absolute ethanol, ultrasonically oscillate for a certain period of time until the graphene is uniformly dispersed (solution B); after mixing and stirring solution A and solution B for 60 minutes, spray-dry at 180°C, and the obtained precursor powder is protected under an argon atmosphere Calcined at 550°C for 6 hours, and then cooled to room temperature to obtain a graphene-composite carbon-coated cobalt phosphate material. XRD results show that the prepared lithium cobalt phosphate cathode material has an olivine-type orthorhombic single-phase structure with high phase purity.

Embodiment 3

[0037] Weigh LiNO according to the stoichiometric ratio 3 , Co(NO 3 ) 2 ·6H 2 O, H 3 PO 4 Each 0.04mol was dissolved in 500mL water, stirred at 80°C for 2h to obtain a clear solution, and spray-dried at 180°C to obtain cobalt lithium phosphate precursor powder. After the obtained cobalt lithium phosphate precursor is fully mixed with 3% graphene (0.19g) by weight ratio of theoretical cobalt lithium phosphate and sucrose (0.458g) corresponding to 3% carbon residue, ethyl alcohol is used as a solvent for 500r / min ball milling After 6 hours of mixing evenly, the resulting mixture was dried and pressed into tablets, then calcined at 500° C. for 6 hours under the protection of an argon atmosphere, and then cooled to room temperature to obtain a graphene composite carbon-coated cobalt phosphate material. XRD results show that the prepared lithium cobalt phosphate cathode material has an olivine-type orthorhombic single-phase structure with high phase purity.

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Abstract

The invention relates to graphene composite carbon-coated cobalt-lithium phosphate material and preparation methods and application thereof and relates to lithium-ion battery anode materials. The graphene composite carbon-coated cobalt-lithium phosphate material comprises cobalt-lithium phosphate, graphene and carbon which are composited through in-situ symbiosis, and the graphene and the carbon generated in situ form a three-dimensional conductive network. The first preparation method includes: dissolving a lithium source, a cobalt source, a phosphorus source and an organic carbon source into water to obtain solution A; dispersing graphene in anhydrous ethanol to obtain solution B; mixing the solution A and the solution B, spray drying to obtain precursor powder, calcining under protective atmosphere, and cooling to room temperature to obtain the graphene composite carbon-coated cobalt-lithium phosphate material. The second preparation method includes: dissolving a lithium source, a cobalt source and a phosphorus source into water, and spray drying to obtain cobalt-lithium phosphate precursor; mixing the cobalt-lithium phosphate precursor with graphene and an organic carbon source, calcining under protective atmosphere, and cooling to room temperature to obtain the graphene composite carbon-coated cobalt-lithium phosphate material. The graphene composite carbon-coated cobalt-lithium phosphate material can be used as the anode material to apply to lithium-ion batteries.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material, in particular to a graphene composite carbon-coated cobalt lithium phosphate material and a preparation method and application thereof. Background technique [0002] Today, with the rapid development of the information industry, batteries, especially secondary batteries, have become an important part of portable electronic equipment. The energy crisis is becoming more and more severe, and the development of new, non-polluting, renewable energy sources (such as solar energy, wind energy, tidal energy, etc.) is a major task related to the sustainable development of human society, and secondary batteries are a reasonable and effective storage And an important medium for utilizing these new energy sources. Among many secondary batteries, lithium-ion batteries are the most popular due to their high specific energy, high voltage, and stable cycle performance. [0003] The long batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 龚正良王志刚
Owner XIAMEN UNIV
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