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Positive current collector, preparation method thereof, positive plate, battery cell and battery

A technology for positive current collectors and batteries, which is applied in the field of battery pole pieces and can solve the problems of low electrical conductivity and current conductivity of positive current collectors

Pending Publication Date: 2022-01-28
XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of this application is to provide a positive electrode collector and its preparation method, positive electrode sheet, battery cell and battery, so as to improve the technical problems of the positive electrode collector's electrical conductivity and low current conductivity

Method used

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  • Positive current collector, preparation method thereof, positive plate, battery cell and battery
  • Positive current collector, preparation method thereof, positive plate, battery cell and battery
  • Positive current collector, preparation method thereof, positive plate, battery cell and battery

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preparation example Construction

[0062] The present application also provides a method for preparing a positive electrode current collector, comprising: forming an adhesive layer on the first surface of the base film, forming a diversion layer with inconsistent thickness on the adhesive layer, and forming a reinforcement layer on the diversion layer . The preparation method of the positive electrode current collector will be described in detail below.

[0063] Preparation of the adhesive layer.

[0064] Before preparing the adhesive layer, the base film may be pretreated, including: performing corona treatment on the first surface and the second surface of the base film. Then, an adhesive layer is formed on the surface of the base film by vapor deposition. The bonding layer is non-metal, optional, non-metal is SiC, Si 3 N 4 , SiO x (1.5≤x≤2) and AlO x At least one of (1≤x≤1.5).

[0065] In some embodiments of the present application, the method for forming the adhesive layer includes:

[0066] Put the...

Embodiment 1

[0091] This embodiment provides a positive electrode current collector and a preparation method thereof, comprising the following steps:

[0092] S1. First, corona treatment is carried out on the surface of the base film to be coated. The thickness of the base film is 12 μm, and then the roll base film is placed in the vacuum chamber of the vacuum coating machine, the vacuum chamber is sealed, and the vacuum is gradually evacuated until the vacuum degree reaches 5 ×10 -2 Pa, use the oxygen ventilation structure near the evaporation source to introduce compressed oxygen, and the ventilation volume is 4000sccm and 3500sccm. Evaporation source The raw material for evaporation is metal aluminum wire or aluminum ingot with purity ≥99.9%. A layer of Al 2 o 3 The oxide layer, ie the bonding layer, is about 10nm thick.

[0093] S2. Put the film with adhesive layer on the surface obtained in S1 into the vacuum chamber of a single-sided or double-sided reciprocating evaporation coat...

Embodiment 2

[0101] This embodiment provides a positive electrode current collector and a preparation method thereof, the only difference from Embodiment 1 is:

[0102] When coating perfluoropolyether oil in S2, the thickness of the coating is gradually reduced from the surface corresponding to the first coating section of the adhesive layer to the surface corresponding to the second functional section. After vapor deposition, an aluminum-coated layer with inconsistent thickness is formed on the surface of the bonding layer, and the thickness of the aluminum-coated layer changes gradually.

[0103] The unequal thickness positive electrode current collector obtained in this embodiment, the structure of the positive electrode current collector is as follows Image 6 .

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Abstract

The invention provides a positive current collector, a preparation method thereof, a positive plate, a battery cell and a battery, and relates to the technical field of battery pole pieces. The positive current collector comprises a base film and a functional layer arranged on the surface of the base film, and the first functional layer comprises an adhesive layer, a diversion layer and a protective layer which are sequentially laminated on the first surface. The first functional layer is divided into a first functional section and a second functional section, and the thickness of the first functional section is larger than that of the second functional section. And the surface of the second functional layer is a coating region, so that the coating region can be coated with more active substances, and the energy density of the positive current collector is improved. The first functional layer comprises a tab section, and a first coating section is arranged among the tab section, the first coating section and the second functional section, so that the thickness of the first coating section is equal to that of the tab section. According to the structure, by increasing the thickness of the functional layer at the joint of the coating region and a tab region, the conductivity and the flow conductivity at the joint of the coating region and the tab region are improved, and the comprehensive overcurrent capacity of the positive electrode current collector is improved.

Description

technical field [0001] The present application relates to the technical field of battery pole pieces, in particular, to a positive electrode current collector, a preparation method thereof, a positive electrode piece, an electric cell, and a battery. Background technique [0002] As an important part of lithium-ion batteries, the current collector plays the role of supporting active materials and conducting current. The positive current collector generally includes a membrane segment coated with positive active material and an ear segment welded to the top cover. The foil material of the current positive electrode current collector is of equal thickness, and this structure has the problems of material waste and high cost. It has been reported that the thickness of the diaphragm area is reduced to reduce the cost, but the structure has the problems of reduced electrical conductivity and reduced conduction capacity. Contents of the invention [0003] The purpose of the pre...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/667H01M4/661H01M10/0525Y02E60/10
Inventor 张芹
Owner XIAMEN HAICHEN NEW ENERGY TECH CO LTD
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