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Battery positive pole piece, lithium ion battery using the same, and method for reducing interface resistance

A battery positive electrode and pole piece technology, which is applied to battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems that restrict the performance of lithium-ion batteries, large interface resistance, etc., and achieve reduced electrochemical polarization and lower interface Resistance, the effect of increasing the contact area

Active Publication Date: 2021-03-12
BEIJING GRAPHENE INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the generally large interfacial resistance between the current collector and the electrode material, it causes a large electrochemical polarization during the charging and discharging process of the battery, which seriously restricts the performance of lithium-ion batteries, especially the rate / power performance

Method used

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  • Battery positive pole piece, lithium ion battery using the same, and method for reducing interface resistance
  • Battery positive pole piece, lithium ion battery using the same, and method for reducing interface resistance
  • Battery positive pole piece, lithium ion battery using the same, and method for reducing interface resistance

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Effect test

Embodiment 1

[0036] The preparation of embodiment 1 graphene composite aluminum foil

[0037] Put the commercial aluminum foil current collector (Shenzhen Kejing) into the plasma chemical vapor deposition device, and repeatedly purge it with argon gas for 3 to 5 times. The equipment is heated to 590°C at a heating rate of 20°C / min, and then methane is passed into it. (Flow rate 10sccm), adjust the plasma equipment to make it produce uniform glow to cover the aluminum foil, and react, the reaction time is 20 minutes. After the reaction is finished, wait for the equipment to drop to room temperature, and a graphene-composite aluminum foil with a vertical graphene layer is obtained.

Embodiment 2

[0038] Embodiment 2 Preparation of positive electrode sheet

[0039] Lithium iron phosphate (LiFePO 4 ), conductive additive (conductive carbon black), binder polyvinylidene fluoride (PVDF), etc., mixed with organic solvent N-methylpyrrolidone (NMP) to form a slurry, in which LiFePO 4 , The mass ratio of conductive carbon black and PVDF is 90:5:5. LiFePO will be configured 4 The slurry was coated on ordinary aluminum foil and graphene composite aluminum foil with vertical graphene layer, dried in an oven at 60°C for 6h, and then dried in vacuum at 80°C for 8h to obtain ordinary LiFePO 4 Positive pole sheet A and LiFePO of the present invention 4 Positive pole piece B.

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Abstract

The invention provides a battery positive pole piece, a lithium ion battery using the same and a method for reducing interface resistance. The positive electrode sheet of the battery includes: a positive electrode current collector, the positive electrode current collector includes a graphene composite aluminum foil material layer; an electrode active material formed on the surface of the positive electrode current collector, including an electrode positive electrode material, a binder and a conductive additive; Wherein, the graphene composite aluminum foil material layer includes: an aluminum foil base, a plane graphene layer parallel to the surface of the aluminum foil base, and a vertical graphene layer vertically located on the plane graphene layer; the content of the conductive additive The mass percentage of the content of the electrode active material is 2%-12%. By using the graphene composite aluminum foil with vertical graphene layer as the current collector material of the positive electrode sheet, the interface resistance of the positive electrode sheet can be effectively reduced.

Description

technical field [0001] The invention relates to battery material technology, in particular to a battery positive pole piece, a lithium ion battery using the same and a method for reducing interface resistance. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and environmental friendliness. They have not only been widely used as power sources for portable electronic devices such as mobile phones, notebook computers, digital cameras, and video cameras, but also in pure electric vehicles, hybrid electric vehicles and other fields. A good application prospect. Among them, the electrode pole piece is the core component of the lithium-ion battery. The electrode sheet is obtained by coating the electrode material on the current collector. The commonly used lithium ion battery positive current collector is aluminum foil, and the negative current collector is copper foil. However, due to the generally large interfacia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 彭海琳王铭展杨皓刘忠范
Owner BEIJING GRAPHENE INST