Lithium ion battery positive current collector, preparation method and lithium ion battery

A technology of lithium ion battery and positive current collector, applied in the direction of electrode carrier/current collector, battery electrode, secondary battery, etc., can solve the problems of affecting battery service life, low peel strength, increase battery resistance, etc. Radius, improving the problem of poor electrical conductivity, and improving the effect of wetting efficiency

Pending Publication Date: 2022-05-10
CHONGQING ZIJIAN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned composite safe positive electrode current collector can greatly improve the safety performance of lithium-ion batteries, but there are the following problems at the same time: 1) PET and metal of the composite foil have a large contact resistance, and at the same time, due to the introduction of media such as flame retardants, the resistance of the battery It will increase, and the power of the battery will decrease; 2) The peel strength between the positive electrode diaphragm and the composite safe positive electrode current collector is not large, and the diaphragm is easy to lose powder during the long-term cycle of the battery, which affects the service life of the battery

Method used

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  • Lithium ion battery positive current collector, preparation method and lithium ion battery
  • Lithium ion battery positive current collector, preparation method and lithium ion battery
  • Lithium ion battery positive current collector, preparation method and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Lithium-ion battery cathode current collector:

[0051] Weigh 50g of graphene oxide powder and add it to 6L of ethylene glycol solution, and ultrasonically vibrate for 2 hours to obtain a ethylene glycol-modified graphene oxide suspension; add the prepared ethylene glycol-modified graphene oxide suspension to the reaction kettle Liquid and 5kg of terephthalic acid and esterification reaction stabilizer trimethyl phosphate 1.5g, catalyst tetrabutyl tertate 1.5g (wherein, the mol ratio of ethylene glycol and terephthalic acid is 3:1), continue Introduce N2 / Ar at a rate of 20mL / min, heat and stir, and carry out esterification reaction. The reaction temperature is 250°C, and the time is 4h to obtain the initial product; The obtained polycondensation reaction prepolymer is fed into a twin-screw extruder for extrusion and granulation to form PET-based conductive composite particles.

[0052] The PET-based conductive composite particles are melted on the 3D printer; and, the ...

Embodiment 2

[0054] Weigh 450g of graphene oxide powder and add it to 6L of ethylene glycol solution, and ultrasonically vibrate for 2 hours to obtain a ethylene glycol-modified graphene oxide suspension; add the prepared ethylene glycol-modified graphene oxide suspension to the reaction kettle Liquid and 10kg of terephthalic acid and esterification reaction stabilizer phosphorous acid 1.2g, catalyst antimony trioxide 1.8g (wherein, the mol ratio of ethylene glycol and terephthalic acid is 1.5:1), continue feeding N2 / Ar, rate 20mL / min, heating, stirring, carry out esterification reaction, reaction temperature 230 ℃, time 6h, get the initial product; The prepolymer is fed into a twin-screw extruder for extrusion and granulation to form PET-based conductive composite particles.

[0055] The PET-based conductive composite particles are melted on the 3D printer; and, the thickness of the required PET porous film set on the 3D printer is 8 μm and the pore diameter is 8 μm and the shape of the ...

Embodiment 3

[0057] Weigh 200g of graphene oxide powder and add it to 8L of ethylene glycol solution, and ultrasonically vibrate for 2 hours to obtain a ethylene glycol-modified graphene oxide suspension; add the prepared ethylene glycol-modified graphene oxide suspension to the reaction kettle Liquid and 10kg of terephthalic acid and esterification reaction stabilizer trimethyl phosphate 1.5g, catalyst ethylene glycol antimony 1.5g (wherein, the mol ratio of ethylene glycol and terephthalic acid is 1.5:1), continue to pass Enter N2 / Ar at a rate of 20mL / min, heat and stir, and carry out esterification reaction. The reaction temperature is 250°C, and the time is 5h to obtain the initial product; The polycondensation reaction prepolymer is fed into a twin-screw extruder for extrusion and granulation to form PET-based conductive composite particles.

[0058] The PET-based conductive composite particles are melted on the 3D printer; and, the thickness of the required PET porous film is set on ...

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Abstract

The invention discloses a lithium ion battery positive electrode current collector, a preparation method and a lithium ion battery, the lithium ion battery positive electrode current collector comprises a first aluminum layer, a second aluminum layer and a PET layer located between the first aluminum layer and the second aluminum layer, and the PET layer is of a latticed structure and is composed of a PET substrate and a conductive agent. The positive current collector of the lithium ion battery has relatively high binding power and electronic conductivity, and ensures that a secondary battery has relatively low internal resistance, long-term cycle stability of the battery and relatively high safety performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery cathode current collector, a preparation method and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have entered our daily life with the advancement of technology and the improvement of environmental protection requirements. With the popularization of lithium-ion batteries, there will occasionally be safety problems caused by external force piercing lithium-ion batteries at the user end, and its safety performance has attracted more and more attention, especially the continuous fermentation of some mobile phone explosions, making Users, after-sales and lithium-ion battery manufacturers have all put forward new requirements for the safety performance of lithium-ion batteries. [0003] The current methods to improve the safety of lithium-ion batteries are all at the expense of the energy density of lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/667H01M4/668H01M4/661H01M10/0525
Inventor 陈启多程君程转霞林观荣
Owner CHONGQING ZIJIAN NEW ENERGY CO LTD
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