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Current collector for lithium ion battery positive electrode and battery with current collector

A lithium-ion battery and current collector technology, applied in the direction of electrode carrier/current collector, battery electrode, secondary battery, etc., can solve the problem that the high-speed discharge capacity and life of the battery need to be further improved, the bonding force between the active material and the current collector is insufficient, and the electrical conductivity Insufficient capacity and other problems to achieve the effect of improving high-power discharge capacity, increasing conductivity, and improving electrode life

Inactive Publication Date: 2016-11-23
中直新能源科技(大连)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate and ternary materials are used as positive electrode materials for high-power lithium-ion batteries, and their conductivity is insufficient. A large amount of carbon-based conductive agent needs to be added, and the binding force between the active material and the current collector is also insufficient. The high-speed discharge capacity of the battery and Life expectancy needs to be further improved

Method used

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  • Current collector for lithium ion battery positive electrode and battery with current collector
  • Current collector for lithium ion battery positive electrode and battery with current collector

Examples

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preparation example Construction

[0043] A preparation method of a current collector for a positive electrode of a lithium ion battery is a microwave plasma chemical vapor deposition method, and the process is as follows:

[0044] 1) Place the aluminum foil substrate in the vacuum container resonant cavity 110, the aluminum foil substrate 105 is connected to the cathode, and the vacuum container 111 is the anode;

[0045] 2) Vacuumize the vacuum container to 0.05-0.1Pa, fill it with argon gas to 50-70Pa, repeat 3 times, and then evacuate to 0.1-5Pa; at the same time, heat the aluminum foil substrate to 280-600°C;

[0046] 3) Under the reaction temperature and the argon pressure of 0.1-5Pa, apply a DC pulse voltage on the aluminum foil substrate 105 to form a plasma 104, treat the aluminum foil substrate for 10-30 minutes, and activate the surface of the aluminum foil substrate 105, wherein the aluminum foil substrate The value of the DC pulse voltage applied on the substrate 105 is 400-600V;

[0047] 4) After...

Embodiment 1

[0050] Preparation of graphene-modified cathode current collector:

[0051] (1) Place the cleaned and degreased 15-micron thick aluminum foil substrate in the vacuum resonance cavity of the microwave plasma equipment, connect the cathode, and the vacuum container is the anode;

[0052] (2) The vacuum container is evacuated to 0.1Pa, filled with argon to 50Pa, evacuated to 0.1Pa, and repeated 3 times; at the same time, the aluminum foil substrate is heated to a temperature of 350°C;

[0053] (3) Under 1.0Pa argon pressure, apply a DC pulse voltage of 600V to the aluminum foil, and use the formed plasma to activate the surface of the aluminum foil substrate for 20 minutes;

[0054] (4) Introduce 2.4GHz microwaves and hydrocarbon gas (mixed gas of ethanol: argon = 1:0.5) into the resonant cavity of the vacuum container, keep the reaction temperature of the resonant cavity at 380°C, and conduct the deposition process for 50 minutes at a pressure of 2Pa, then stop Introducing micr...

Embodiment 2

[0061] Preparation of graphene-modified cathode current collector:

[0062] (1) Place the cleaned and degreased 20-micron thick aluminum foil substrate in the vacuum resonance cavity of the microwave plasma equipment, connect the cathode, and the vacuum container is the anode;

[0063] (2) The vacuum container is evacuated to 0.1Pa, filled with argon to 50Pa, evacuated to 0.1Pa, and repeated 3 times; at the same time, the aluminum foil substrate is heated to a temperature of 550°C;

[0064] (3) Under 5.0Pa argon pressure, apply a DC pulse voltage of 500V to the aluminum foil, and use the formed plasma to activate the surface of the aluminum foil substrate for 20 minutes;

[0065] (4) Introduce 2.4GHz microwaves and hydrocarbon gas (ethanol: argon = 1:1 mixed gas) into the resonant cavity of the vacuum container, keep the resonant cavity reaction temperature at 500°C, and deposit for 30 minutes at a pressure of 5 Pa, then stop Introduce microwave and hydrocarbon gas, reduce th...

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Abstract

The invention relates to a current collector for a lithium ion battery positive electrode and a battery with the current collector, in particular to a high-power lithium ion battery, and belongs to the technical field of secondary batteries. The current collector comprises an aluminum foil base, and a graphene layer is deposited on at least one surface of the aluminum foil base by a microwave plasma chemical vapor deposition method. By the aid of microwave plasma chemical vapor deposition, a low-temperature graphene film can be prepared, an aluminum foil current collector of the lithium ion battery positive electrode can be modified, the graphene layer and the aluminum foil base are excellently adhered, electrical conductivity of the current collector is improved, electrode service life is prolonged, adhesive force of the current collector and an electrode active material is greatly improved by the graphene layer, interface contact resistance between the current collector and the active material is reduced, so that high-power discharge capacity of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to a current collector for the positive electrode of a lithium ion battery and a battery containing the current collector, relates to a high-power lithium ion battery, and belongs to the technical field of secondary batteries. Background technique [0002] Lithium-ion battery is a high-performance secondary battery, which has the advantages of high working voltage, large volume and energy density, long service life and small self-discharge, and is widely used in various digital products, mobile communication equipment and power tools and other fields. With the application of lithium-ion batteries in electric vehicles and electric vehicles, the high-speed discharge capability of lithium-ion batteries, that is, high-power batteries, is increasingly required. The conductivity of the electrode sheet directly affects the output power of the battery. [0003] The current collector is a structure or component that collects current in a...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/64H01M4/66C23C16/44C23C16/52
CPCC23C16/44C23C16/52H01M4/64H01M4/66H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 孙雅荻孙俊才
Owner 中直新能源科技(大连)有限公司
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