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Graphite composite lithium ion battery anode material lithium iron phosphate and preparation method thereof

A lithium-ion battery and graphene composite technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of reducing the tap density of materials and the large volume of lithium-ion power batteries, and improve the tap density and electrochemical performance. Excellent, reducing the effect of internal resistance

Active Publication Date: 2009-10-21
龚思源
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the rate performance of the battery, the carbon-composite positive electrode material needs to be filled with more carbon, which will greatly reduce the tap density of the material and cause the lithium-ion power battery to be too bulky

Method used

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  • Graphite composite lithium ion battery anode material lithium iron phosphate and preparation method thereof
  • Graphite composite lithium ion battery anode material lithium iron phosphate and preparation method thereof
  • Graphite composite lithium ion battery anode material lithium iron phosphate and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] Fully mix the pure phase powder of nano-lithium iron phosphate and 1% graphene according to the weight ratio of lithium iron phosphate for 5 hours, keep it in a furnace at 550°C with a nitrogen protective atmosphere for 1.5 hours, and then cool to room temperature to obtain a graphene composite lithium iron phosphate cathode material. Conductivity of graphene-composite lithium iron phosphate from pure phase 10 -9 S / cm increased to 10 -4 S / cm order of magnitude, tap density is 1.8g / cm 3 . figure 1 It is an X-ray diffraction pattern, and the raw material lithium iron phosphate analyzed is pure lithium iron phosphate of olivine-type orthorhombic single-phase structure, figure 2 is a transmission electron microscope image of the composite material.

[0021] The active material lithium iron phosphate powder, the conductive agent acetylene black and the binder polyvinylidene fluoride are mixed in a mass ratio of 8.5:0.5:1 and evenly coated on the aluminum foil to form a ...

Embodiment 2

[0024] The pure phase powder of nano-lithium iron phosphate and 0.1% graphene according to the weight ratio of lithium iron phosphate are fully ball-milled for 2 hours in ethanol, which is 2 times the weight ratio of all raw materials, as a liquid medium, and then heated in a furnace at 300 ° C with an argon protective atmosphere Insulated and reacted for 5 hours, then cooled to room temperature to obtain graphene-composite lithium iron phosphate positive electrode material. Conductivity before and after compounding from 10 -9 S / cm increased to 10 -4 S / cm order of magnitude, tap density is 1.9g / cm 3 . The specific capacities of the obtained products are about 145 and 96mAh·g when discharged at 1C and 20C rates, respectively. -1 .

Embodiment 3

[0026] The pure phase powder of nano-lithium iron phosphate and 2.5% graphene oxide in the weight ratio of lithium iron phosphate were fully mixed for 30 hours, kept in a furnace at 850°C with a mixed protective atmosphere of hydrogen and argon for 2 hours, and then cooled to room temperature to obtain Graphene composite lithium iron phosphate cathode material. Conductivity before and after compounding from 10-9 S / cm increased to 10 -4 S / cm order of magnitude, tap density is 1.75g / cm 3 . The specific capacities of the obtained products are about 152 and 103 mAh·g when discharged at 1C and 20C rates, respectively. -1 .

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Abstract

The invention relates to a graphene composite lithium ion battery anode material lithium iron phosphate and a preparation method thereof. The composite material of lithium iron phosphate and graphene is connected by interface of chemical bonding. The invention also provides the method for preparing the graphene composite lithium ion battery anode material lithium iron phosphate in an in-situ symbiosis reaction mode, and the obtained anode material has high tap density and good magnifying performance, and is suitable to be used as a anode material of a lithium ion power battery.

Description

technical field [0001] The invention relates to a graphene-composite lithium-ion battery cathode material, lithium iron phosphate, and a preparation method thereof. The composite material of lithium iron phosphate and graphene is connected by a chemically bonded interface, and at the same time, it provides an in-situ symbiotic reaction method for preparing lithium The method of the lithium iron phosphate positive electrode material of the ion battery has high tap density and good rate performance of the obtained positive electrode material, and is suitable for being used as the positive electrode material of the lithium ion power battery. Background technique [0002] Graphene is a new carbonaceous material that is densely packed into a two-dimensional hexagonal lattice structure by a single layer of carbon atoms. basic unit. Graphene has excellent electrical, thermal, and mechanical properties, and is expected to be widely used in high-performance nanoelectronic devices, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/38H01M4/04
CPCY02E60/12Y02E60/10
Inventor 黄富强龚思源刘红仙
Owner 龚思源
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