Unlock instant, AI-driven research and patent intelligence for your innovation.

Carbon-coated lithium iron phosphate composite material as well as preparation method and application thereof

A technology of carbon-coated lithium iron phosphate and composite materials, applied in the direction of positive electrode, active material electrode, structural parts, etc., can solve the problems of limited application, reduced specific capacity, low lithium iron phosphate ion conductivity and electronic conductivity, etc. , to reduce production costs, improve electrical conductivity, and reduce the amount of carbon coating

Pending Publication Date: 2021-11-23
柳州紫荆技术转移中心有限公司 +1
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of its own structure, the ionic conductivity and electronic conductivity of lithium iron phosphate are low, which is only suitable for charging and discharging at low current density, and the specific capacity decreases when charging and discharging at high rates, which limits the application of this material.
[0004] The application of nanoscale lithium iron phosphate is also subject to the above limitations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of the carbon-coated lithium iron phosphate composite material provided in this embodiment specifically includes the following steps:

[0038] (1) Synthesis of nano-lithium iron phosphate materials by hydrothermal method: Lithium phosphate and ferrous sulfate with a molar ratio of 1:1 are used as raw materials to carry out hydrothermal reaction in aqueous glucose solution to synthesize nano-lithium iron phosphate materials. The temperature of hydrothermal reaction The temperature is 260°C, and the hydrothermal reaction time is 12 hours.

[0039] (2), the nano-lithium iron phosphate obtained in step (1) and glucose, graphene were dry-mixed and ground in a ball mill for 4 hours to obtain a mixture; wherein, lithium iron phosphate: glucose: graphene=100:4:0.1 (mass Compare).

[0040] (3) The mixture obtained in step (2) was heated at 700° C. for 1 hour under the protection of nitrogen.

[0041] (4), pulverize the product obtained in step (3), and c...

Embodiment 2

[0043] The preparation method of the carbon-coated lithium iron phosphate composite material provided in this embodiment specifically includes the following steps:

[0044] (1) Synthesis of nano-lithium iron phosphate materials by hydrothermal method: use lithium phosphate and ferrous sulfate with a molar ratio of 1.1:1 as raw materials to conduct hydrothermal reaction in aqueous glucose solution to synthesize nano-lithium iron phosphate materials, the temperature of hydrothermal reaction The temperature is 240°C, and the hydrothermal reaction time is 10 hours.

[0045] (2), the nano-lithium iron phosphate obtained in step (1) and glucose, graphene were dry-mixed and ground in a ball mill for 5 hours to obtain a mixture; wherein, lithium iron phosphate: glucose: graphene=100:0.1:0.001 (mass Compare).

[0046] (3) The mixture obtained in step (2) was heated at 650° C. for 2 hours under the protection of nitrogen.

[0047] (4), pulverize the product obtained in step (3), and c...

Embodiment 3

[0049] The preparation method of the carbon-coated lithium iron phosphate composite material provided in this embodiment specifically includes the following steps:

[0050] (1) Synthesis of nano-lithium iron phosphate materials by hydrothermal method: use lithium phosphate and ferrous sulfate with a molar ratio of 1.2:1 as raw materials to synthesize nano-lithium iron phosphate materials by hydrothermal reaction in aqueous glucose solution, the temperature of hydrothermal reaction The temperature is 280°C, and the hydrothermal reaction time is 11 hours.

[0051] (2), the nano-lithium iron phosphate obtained in step (1) and glucose, graphene were dry-mixed and ground in a ball mill for 4.5 hours to obtain a mixture; wherein, lithium iron phosphate: glucose: graphene=100:10:2 (mass Compare).

[0052](3) The mixture obtained in step (2) was heated at 680° C. for 1.5 hours under nitrogen protection.

[0053] (4), pulverize the product obtained in step (3), and collect by sieving...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of preparation of lithium ion battery electrode materials, in particular to a method and application of carbon-coated nanoscale lithium iron phosphate, and the method comprises the following steps: (a) synthesizing a nanometer lithium iron phosphate material by a hydrothermal method; and (b) mixing the nano lithium iron phosphate material obtained in the step (a) with a carbon source, performing dry grinding, and performing heat treatment to obtain a carbon-coated lithium iron phosphate composite material, wherein the carbon source comprises an organic carbon source and an inorganic carbon source, and the mass ratio of the nanometer lithium iron phosphate material to the organic carbon source to the inorganic carbon source is 100: (0.1-10): (0.001-2). According to the preparation method of the carbon-coated lithium iron phosphate composite material provided by the invention, the use amount of carbon when a carbon material is coated with nanoscale lithium iron phosphate is reduced in a mode of combining an inorganic carbon source and an organic carbon source. Moreover, a dry grinding method is adopted, an organic solvent does not need to be used, the technological process is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery electrode materials, in particular to a method and application of carbon-coated nanoscale lithium iron phosphate. Background technique [0002] Lithium-ion batteries mainly include three parts: positive electrode, electrolyte and negative electrode. Among them, the cathode material of lithium-ion battery is the key factor that determines the electrochemical performance, safety performance, energy density and price cost of the battery. At present, there are many cathode materials for lithium-ion batteries, such as cobalt-based cathode materials, nickel-based cathode materials, manganese-based cathode materials, and lithium iron phosphate cathode materials. [0003] Among them, the theoretical capacity of the lithium iron phosphate cathode material is 170mAh / g, the reversible charge-discharge specific capacity is high, and it also has the advantages of a wide range of raw...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M10/0525H01M2004/028Y02E60/10
Inventor 周虎张斌管鸿运
Owner 柳州紫荆技术转移中心有限公司