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Preparation method for positive electrode material of power lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced battery efficiency and cycle performance, capacity attenuation, poor conductivity, etc., to achieve excellent electrical performance, improve efficiency, and super The effect of surface area

Inactive Publication Date: 2013-04-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But iron trifluoride (FeF 3 ) has poor conductivity, and in the process of deintercalation of lithium ions, it is accompanied by severe polarization, which leads to serious capacity attenuation in the process of charging and discharging, which reduces the efficiency and cycle performance of the battery

Method used

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  • Preparation method for positive electrode material of power lithium ion battery
  • Preparation method for positive electrode material of power lithium ion battery
  • Preparation method for positive electrode material of power lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1) Preparation of graphite oxide:

[0030] Take 1g (8000 mesh) of natural flake graphite and 47ml of sulfuric acid with a mass concentration of 98% and mix evenly, then add 1.7g of potassium nitrate, quickly add 5.2g of potassium permanganate in a water bath at 7°C, mix well, and then add potassium permanganate The process maintains the system temperature at 0-20°C. Then raise the temperature of the system to 50°C, react for 1.5h, then add 70ml of water, and at the same time raise the temperature of the system to 90°C for 13min, then add 160ml of distilled water to terminate the reaction, centrifugally wash until the pH is 6, and vacuum dry at 70°C to obtain graphite oxide solid. XRD characterization as image 3 , the interlayer distance of graphite oxide is 0.863nm, which is greatly increased compared with the interlayer distance of 0.34nm of initial graphite, indicating that the effect of intercalation graphite oxide is very good.

[0031] 2) FeF 3 Preparation of ...

Embodiment 2

[0039] 1) Preparation of graphite oxide:

[0040] Take 1g (8000 mesh) of natural flake graphite and 56ml of sulfuric acid with a mass concentration of 92% and mix evenly, then add 1.2g of potassium nitrate, quickly add 5.8g of potassium permanganate in a water bath at 11°C, mix well, and then add potassium permanganate The process maintains the system temperature at 0-20°C. Then raise the temperature of the system to 50°C, react for 2 hours, then add 60ml of water, and at the same time raise the temperature of the system to 75°C for 25 minutes, then add 200ml of distilled water to terminate the reaction, centrifugally wash until the pH is 5, and vacuum dry at 65°C to obtain solid graphite oxide . Consistent with the characterization results of Example 1, the interlayer distance of graphite oxide is 0.85nm, which is significantly increased compared with the initial graphite, indicating that the oxidation effect of graphite oxide is very good.

[0041] 2) FeF 3 Preparation of...

Embodiment 3

[0048]1) Preparation of graphite oxide:

[0049] Take 1g (8000 mesh) of natural flake graphite and 43ml of sulfuric acid with a mass concentration of 96% and mix evenly, then add 2g of potassium nitrate, quickly add 6g of potassium permanganate in a water bath at 10°C, mix well, and add potassium permanganate Keep the system temperature at 0-20°C. Then raise the temperature of the system to 45°C, react for 3 hours, then add 60ml of water, and at the same time raise the temperature of the system to 85°C for 20 minutes, then add 120ml of distilled water to terminate the reaction, centrifugally wash until the pH is 7, and vacuum dry at 50°C to obtain solid graphite oxide . Consistent with the characterization results of Example 1, the interlayer distance of graphite oxide is 0.845nm, which is significantly increased compared with the initial graphite, indicating that the oxidation effect of graphite oxide is very good.

[0050] 2) FeF 3 Preparation of nanoparticles:

[0051] ...

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Abstract

The invention relates to a preparation method for a positive electrode material of a power lithium ion battery. The preparation method comprises the following concrete steps: preparing a graphite oxide solution, then preparing a nanometer FeF3 particle and preparing a non-supported FeF3 / graphene oxide film; and subjecting the obtained non-supported FeF3 / graphene oxide film to photoreduction so as to obtain the positive electrode material of the power lithium ion battery, i.e., a FeF3 / graphene film. According to the invention, the phenomenon of severe polarization of a FeF3 material in cyclic process of the battery is effectively overcome; meanwhile, FeF3 / graphene oxide is innovatively reduced by using a latest photoreduction method so as to overcome the disadvantages of production of Fe and agglomeration of nanometer particles in reduction of FeF3 by using a traditional high temperature reduction method, and specific capacity of the positive electrode material of the power lithium ion battery is substantially improved. The preparation method provided by the invention is simple; the prepared FeF3 / graphene film can be directly used as the positive electrode material of the power lithium ion battery, and addition of other conductive additives and binders is avoided; and the positive electrode material has good ductility and flexible processability and is suitable for industrial large-scale production.

Description

Technical field: [0001] The invention relates to a method for preparing a positive electrode material of a power lithium ion battery, in particular to a method for preparing a positive electrode material of a power lithium ion battery, an iron trifluoride-graphene composite material, which belongs to the preparation of a high capacity, high efficiency power lithium ion battery positive electrode material method. Background technique: [0002] With the increasing reduction of oil, coal and other energy sources, human society is facing an increasingly serious energy crisis. As a high-performance green energy storage device, lithium-ion batteries have the characteristics of good performance, safety, low cost, and environmental friendliness, and have become the first choice for large-scale power sources such as pure electric vehicles (EV), hybrid electric vehicles (HEV) and aerospace . Lithium-ion battery cathode material is an important part of the battery. The performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/583
CPCY02E60/10
Inventor 暴宁钟何大方沈丽明王一峰
Owner NANJING UNIV OF TECH
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