Preparation method of metal doped lithium manganese phosphate/graphene/carbon composite material

A carbon composite material, lithium manganese phosphate technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor cycle stability, attenuation, serious polarization, and low reversible capacity.

Active Publication Date: 2013-10-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the existing technology of lithium manganese phosphate materials such as poor electronic conductivity, serious polarization during charge and discharge, low reversible capacity, poor cycle stability, and severe attenu

Method used

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  • Preparation method of metal doped lithium manganese phosphate/graphene/carbon composite material
  • Preparation method of metal doped lithium manganese phosphate/graphene/carbon composite material
  • Preparation method of metal doped lithium manganese phosphate/graphene/carbon composite material

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example 1

[0035] ①According to the theory of lithium manganese phosphate:graphene=1:0.005 mass ratio, disperse graphene (0.028g) in a mixture containing manganous sulfate (0.0288mol), ferrous sulfate (0.0072mol), phosphoric acid (0.036mol), ascorbic acid ( 0.01mol) of water and ethylene glycol at a volume ratio of 1:2 in a mixed solvent of 120ml, ultrasonically dispersed for 12h, and sheared at a speed of 10000r / min on a high-speed shear for 1h to fully disperse the graphene Uniform, called A liquid. Dissolve lithium hydroxide (0.108mol) in 120ml of a mixed solvent composed of water and ethylene glycol with a volume ratio of 1:2 to form liquid B, and then add it dropwise to liquid A to prepare the precursor of lithium manganese phosphate solution, wherein the concentration of lithium ions is 0.45mol / L. It is placed in a high-temperature and high-pressure reactor, and the filling capacity of the reactor is 60%. The lithium manganese phosphate / graphene composite material LiMn with graph...

example 2

[0041] ①According to the theoretical mass ratio of lithium manganese phosphate:graphene=1:0.03, disperse graphene (0.22g) in a mixture containing manganous sulfate (0.0456mol), magnesium sulfate (0.0024mol), phosphoric acid (0.048mol), ascorbic acid (0.0024 mol) and glucose (0.0133mol) in a mixed solvent of water and ethanol with a volume ratio of 1:2.5, ultrasonicated for 12 hours, and sheared for 1 hour at a speed of 10,000 r / min on a high-speed shearing machine to fully disperse graphene Uniform, called A liquid, called A liquid, the volume of A liquid is 200ml. Dissolve lithium hydroxide (0.144mol) in a mixed solvent composed of water and ethanol with a volume ratio of 1:2.5. The volume of the mixed solvent is 160ml. After dissolving, add it dropwise to liquid A to prepare the precursor of lithium manganese phosphate solution, wherein the concentration of lithium ions is 0.8mol / L. It is placed in a high-temperature and high-pressure reactor, and the filling capacity of th...

example 3

[0044] ① According to the theoretical mass ratio of lithium manganese phosphate: graphene = 1:0.01, disperse graphene (0.038g) in a mixture containing manganous acetate (0.0216mol), copper sulfate (0.0024mol), oxalic acid (0.0014mol) and glucose (0.01 mol) of water and polyethylene glycol 400 in a volume ratio = 5:6, after ultrasonication for 12 hours, and shearing for 1 hour at a speed of 10,000 r / min on a high-speed shearing machine, the graphene is fully dispersed and uniform. It is called liquid A, and the volume of liquid A is 80ml. Dissolve lithium dihydrogen phosphate (0.072mol) in a mixed solvent composed of water and polyethylene glycol 400 at a volume ratio of 5:6. The volume of the mixed solvent is 80ml. After dissolving, add it dropwise to liquid A to obtain phosphoric acid The precursor solution of lithium manganese, wherein the concentration of lithium ions is 0.45mol / L. It is placed in a high-temperature and high-pressure reactor, and the filling capacity of th...

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Abstract

The invention discloses a preparation method of a metal doped lithium manganese phosphate/graphene/carbon composite material. By adopting the method, the graphene is added in the preparation process of the lithium manganese phosphate to replace partial conductive carbon black; and a precursor which is a mixture of three solutions is transferred to a reaction tank and is subjected to solvothermal reaction at 160-300 DEG C for 1-20 hours to obtain the graphene in-situ composite lithium manganese phosphate material. According to the preparation method disclosed by the invention, the surface-contact compounding of graphene and lithium manganese phosphate is achieved by taking advantage of the flexibility characteristic of graphene, and the electronic conductivity of the lithium manganese phosphate is improved by taking advantage of the extremely high conductivity of graphene. By adopting the preparation method disclosed by the invention, not only is the intrinsic electronic conductivity of the composite material improved, but also a graphene film layer with extremely high conductivity is uniformly coated on the surface of the lithium manganese phosphate material, the graphene and the conductive carbon black together form a three-dimensional conductive network, and therefore the electrochemical performance of the lithium manganese phosphate material is obviously improved, and the composite material can be used as the anode material of a lithium ion battery.

Description

technical field [0001] The invention belongs to the preparation of lithium-ion battery cathode materials in the field of electrochemistry and new energy materials, and specifically relates to a preparation method of a metal-doped lithium manganese phosphate / graphene / carbon composite material. Background technique [0002] The progress of society and the continuous growth of people's needs make clean and efficient energy more and more people's attention. On the one hand, for many clean new energy sources (such as solar energy, wind energy, tidal energy, and geothermal energy), large-capacity energy storage devices are required to store these energy sources for use when people need them, and lithium-ion secondary batteries have become the best choice. . On the other hand, replacing fuel vehicles with electric vehicles has become the key development direction of various countries. Battery technology is the core of electric vehicle production and plays a vital role in the devel...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 任丽王芳芳
Owner HEBEI UNIV OF TECH
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