A high-purity copper matrix graphene composite lithium ion battery and preparation method thereof

A graphene composite and lithium-ion battery technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems that are difficult to overcome due to the different physical properties of the active layer of the graphene electrode and the current collector, and the insufficient combination of the active material and the current collector. Tightness, reducing electrode cycle charge/discharge life and other issues, to achieve the effect of reducing the internal resistance of the charge transfer interface, improving charge/discharge performance, and increasing capacity

Inactive Publication Date: 2019-01-18
凌飞
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different physical properties of the applied slurry and the current collector, the heating and curing during electrode preparation and the volume change during the long-term cycle charge / discharge of the battery often fall off because the combination between the active material and the current collector is not tight enough. And reduce the cycle charge / discharge life of the electrode
Of course, in order to solve the shortcomings of the smearing of the graphene electrode active material slurry, there are also physical or chemical methods such as electrodeposition on the current collector to self-assemble the graphene electrode active material on the current collector, but there are also problems such as harsh preparation conditions, The obtained graphene electrode active layer is thin, the specific capacity is low, and it is difficult to overcome the problem of different physical properties between the graphene electrode active layer and the current collector, and the cycle performance of the battery is poor.

Method used

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  • A high-purity copper matrix graphene composite lithium ion battery and preparation method thereof
  • A high-purity copper matrix graphene composite lithium ion battery and preparation method thereof
  • A high-purity copper matrix graphene composite lithium ion battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0046] S100: Mix pure graphene powder with a purity of not less than 99.99% and a fineness of 6000 mesh with lithium cobaltate, lithium manganate and / or lithium iron phosphate at a mass ratio of 1:1, and stir at 90rpm for 45min until they are completely mixed Dissolve as a whole to obtain the primary mixed filler; then add organic solvent, sodium nitrate and potassium permanganate with a fineness of 1500 mesh to each 2 parts of the primary mixed filler according to the mass ratio of 1:1:0.5 and mix them, and mix them through 90rpm and 45min Stir until they are completely dissolved into one another to obtain a graphene mixed filler;

[0047] S200: Divide the surface of the round-hole rectangular high-purity copper mesh with copper purity not less than 99.99% into three parts: left, middle and right, and then open two grooves between the three parts;

[0048] S300: Fill the graphene mixed filler into the left and right meshes of the high-purity copper mesh as the positive and ne...

Embodiment 2

[0053] S50: Put the rectangular high-purity copper mesh with tooth-shaped holes with a copper purity of not less than 99.99% in sequentially placed in 5% FeCl 3 and HCl dilute solution for 20min, then placed in Ar / H 2 Annealing treatment under atmosphere for 30min, annealing temperature 1000℃;

[0054] S100: Mix pure graphene powder with a purity of not less than 99.99% and a fineness of 10,000 mesh with lithium cobaltate, lithium manganate and / or lithium iron phosphate at a mass ratio of 1.5:0.5, and stir at 60rpm for 60min until they are completely Dissolve as one to obtain the primary mixed filler; then add organic solvent, sodium nitrate and potassium permanganate with a fineness of 1200 meshes to each 2 parts of the primary mixed filler according to the mass ratio of 1.5:1.5:0.2, and mix them through 120rpm, 30min Stir until they are completely dissolved into one another to obtain a graphene mixed filler;

[0055] S200: Divide the surface of the rectangular high-purity ...

Embodiment 3

[0061] S50: Soak the rectangular high-purity copper mesh with tooth-shaped holes with a copper purity of not less than 99.99% in a dilute solution of 5% FeCl3 and HCl for 10 minutes, and then place it in an N2 atmosphere for annealing treatment for 50 minutes at an annealing temperature of 800°C ;

[0062] S100: Mix pure graphene powder with a purity of not less than 99.99% and a fineness of 12,000 mesh with lithium cobaltate, lithium manganate and / or lithium iron phosphate at a mass ratio of 0.5:1, and stir at 120rpm for 30min until they are completely Dissolve as a whole to obtain the primary mixed filler; then add organic solvent, sodium nitrate with a fineness of 2000 mesh and potassium permanganate to each 2 parts of the primary mixed filler according to the mass ratio of 0.5:0.7:0.7 and mix them. After 100rpm, 40min Stir until they are completely dissolved into one another to obtain a graphene mixed filler;

[0063] S200: Divide the surface of the rectangular high-purit...

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Abstract

The invention discloses a high-purity copper matrix graphene composite lithium ion battery and a preparation method thereof. The high-purity copper matrix graphene composite lithium ion battery comprises a high-purity copper mesh sheet, a graphene mixing filler, an electrolyte filler, and a separator; A surface of that high-purity cop mesh sheet is provided with two groove which divide the surfaceinto three parts, A plurality of meshes are distributed on the surface of the high-purity copper mesh sheet in three parts, graphene mixed filler is closely filled in the meshes of the left and rightparts of the surface of the high-purity copper mesh sheet as a positive electrode and a negative electrode, the electrolyte filler is closely filled in the meshes of the middle part of the surface ofthe high-purity copper mesh sheet, and a diaphragm is distributed and fastened on two grooves on the surface of the high-purity copper mesh sheet. The preparation method of the invention comprises the steps of preparing a graphene mixed filler, slotting a high-purity copper mesh sheet, mesh filling, drying and carbonizing, fixing a diaphragm, and assembling. The invention has the advantages of high performance capacity, high conductivity, high magnification, high strength and fast liquid absorption effect and high efficiency cycling performance, and can meet various requirements of fast charging and slow discharging.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and specifically relates to a high-performance capacity, high conductivity, high rate, high-strength and fast liquid absorption effect and high-efficiency cycle performance, which can meet various needs of fast charging and slow discharging. A high-purity copper matrix graphene composite lithium-ion battery and a preparation method thereof. Background technique [0002] With the development of science and technology, the popularization of new energy vehicles and portable electronic devices has put forward higher requirements for batteries as their energy sources. Compared with traditional lead-acid and nickel metal hydride batteries, lithium-ion batteries have the advantages of no memory effect, high specific capacity, environmental friendliness, and fast charging and discharging, so they are widely used in energy storage batteries. [0003] Graphene is a new type of funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/66H01M4/80H01M10/058
CPCH01M4/661H01M4/80H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 凌飞
Owner 凌飞
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