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Copper foil composite material, preparation method thereof, negative pole piece and lithium ion battery

A composite material and copper foil technology, which is applied in battery electrodes, secondary batteries, metal material coating processes, etc. Industrialized production, alleviation of chalking problems, and the effect of strong cohesion

Inactive Publication Date: 2021-04-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to provide a copper foil composite material to solve the problem that when silicon-based materials are used as negative electrode active materials in the prior art, the capacity of silicon-based materials decays quickly in the early stage and the silicon-based materials are easy to decompose from the current collector copper foil in the later stage. The problem of falling off and leaking copper

Method used

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  • Copper foil composite material, preparation method thereof, negative pole piece and lithium ion battery
  • Copper foil composite material, preparation method thereof, negative pole piece and lithium ion battery
  • Copper foil composite material, preparation method thereof, negative pole piece and lithium ion battery

Examples

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Effect test

Embodiment 1

[0066] S1) Preparation of copper foil composite material A1:

[0067] Dissolve 5ml of N-(aminoethyl)-γ-aminopropyltrimethoxysilane and 5ml of deionized water in 90ml of absolute ethanol solution, and react with constant stirring at 20°C for 90min to obtain a volume fraction of 5% aminosilane coupling agent solution; soak the copper foil in the obtained solution, take it out after 2 minutes, and then place it at 100° C. for 1 hour in vacuum treatment to obtain the copper foil composite material, denoted as A1.

[0068] S2) making of pole piece N1:

[0069] Mix 15 parts by mass of polyacrylic acid (abbreviated as PAA), 15 parts by mass of binder Super P and 70 parts by mass of active material nano-silicon with a mortar, then add 0.2ml of secondary water to obtain negative electrode slurry ; Evenly coat the negative electrode slurry on the modified copper foil composite material A1, and the solid coating amount is 1mg / cm 2 , and then dried in a vacuum oven at 100° C. for 12 hou...

Embodiment 2

[0075] S1) Preparation of copper foil composite material A2:

[0076] Dissolve 3ml of N-(aminoethyl)-γ-aminopropyltrimethoxysilane and 3ml of deionized water in 94ml of absolute ethanol solution, and react with constant stirring at 20°C for 90min to obtain a volume fraction of 3% aminosilane coupling agent solution; soak the copper foil in the obtained solution, take it out after 2 minutes, and then place it at 100° C. for 1 hour in vacuum treatment to obtain the copper foil composite material, which is designated as A2.

[0077] S2) making of negative electrode sheet N2:

[0078] Mix 15 parts by mass of polyacrylic acid (abbreviated as PAA), 15 parts by mass of binder Super P and 70 parts by mass of active material nano-silicon with a mortar, then add 0.2ml of secondary water to obtain negative electrode slurry ; Evenly coat the negative electrode slurry on the modified copper foil composite material A2, and the solid coating amount is 1mg / cm 2 , and then dried in a vacuum ...

Embodiment 3

[0082] S1) Preparation of copper foil composite material A3:

[0083] Dissolve 1ml of N-(aminoethyl)-γ-aminopropyltrimethoxysilane and 1ml of deionized water in 98ml of absolute ethanol solution, and react with constant stirring at 20°C for 90min to obtain a volume fraction of 1%. aminosilane coupling agent solution; soak the copper foil in the obtained solution, take it out after 2 minutes, and then place it at 100°C for 1 hour in vacuum treatment to obtain the copper foil composite material, which is designated as A3.

[0084] S2) making of pole piece N3:

[0085] Mix 15 parts by mass of polyacrylic acid (abbreviated as PAA), 15 parts by mass of binder Super P and 70 parts by mass of active material nano-silicon with a mortar, then add 0.2ml of secondary water to obtain negative electrode slurry ; Evenly coat the negative electrode slurry on the modified copper foil composite material A3, the solid coating amount is 1mg / cm 2 , and then dried in a vacuum oven at 100° C. for...

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Abstract

The invention provides a copper foil composite material, a preparation method thereof, a negative pole piece and a lithium ion battery, and relates to the field of batteries. The copper foil composite material comprises a copper foil, and the surface of the copper foil is modified by an amino silane coupling agent. By utilizing the copper foil composite material, the problems that in the prior art, when a silicon-based material is used as a negative electrode active material, the capacity of the silicon-based material is rapidly attenuated in the early cycle and foil leakage occurs in the later cycle can be solved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a copper foil composite material and a preparation method thereof, a negative pole piece and a lithium ion battery. Background technique [0002] At present, in commercial lithium-ion batteries, the active material of the anode is mainly graphite. However, due to the limited mass specific capacity of graphite, there is little room for improvement in volume specific capacity. Lithium-ion batteries using graphite as the anode active material cannot meet the needs of future high-capacity, small volume / mass electronic devices. [0003] Through research, it has been found that silicon is one of the most promising materials as an anode material for lithium-ion batteries. The theoretical gram capacity of silicon-based materials can be as high as 4200mAh / g, and the theoretical volume specific capacity can be as high as 7200mAh / cm 3 . However, during the delithiation / intercalation process of s...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/134H01M10/0525C23C22/05
CPCC23C22/05C23C2222/20H01M4/134H01M4/661H01M4/665H01M4/667H01M10/0525Y02E60/10
Inventor 凌敏孟祥娟徐天乐郑俊超
Owner ZHEJIANG UNIV
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