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Pole piece and preparation method thereof, battery cell and battery

A pole piece and cell technology, which is applied in the field of pole piece and its preparation, battery cell and battery, can solve the problems of micro-short circuit of positive and negative pole pieces, increase mass energy density, avoid internal short circuit, and reduce specific gravity Effect

Inactive Publication Date: 2020-12-04
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the separator in the battery is damaged due to foreign objects inside or external punctures, the positive and negative electrodes on both sides of the damaged part may be conducted and a micro-short circuit occurs

Method used

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  • Pole piece and preparation method thereof, battery cell and battery
  • Pole piece and preparation method thereof, battery cell and battery
  • Pole piece and preparation method thereof, battery cell and battery

Examples

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Comparison scheme
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preparation example Construction

[0044] 2. Preparation method of pole piece

[0045] A second aspect of the present invention provides a method for preparing a pole piece, comprising the following steps:

[0046] preparing a first self-supporting layer and a second self-supporting layer;

[0047] Depositing a first conductive metal layer on one side of the first self-supporting layer, and depositing a second conductive metal layer on one side of the second self-supporting layer;

[0048] The first metal conductive layer and the second metal conductive layer are pasted together and rolled to form pole pieces.

[0049] In some embodiments, before the first metal conductive layer and the second metal conductive layer are laminated, a metal foil strip is placed between the two, so that at least a part of the metal foil strip is exposed to the first metal conductive layer and / or The second metal conductive layer is rolled to form a pole piece. The metal foil strip can be arranged on one edge of the first metal ...

Embodiment 1

[0059] Preparation of positive electrode sheet:

[0060] Mix NCM523 powder, SP conductive carbon black, VGCF carbon nanofibers and PTFE in a ratio of 92:3:3:2, then stir and mix evenly at 350°C under inert gas protection to form a block, and place the block in Press on a heating plate at 350°C to a thickness of 55 μm to make the first self-supporting layer of the positive electrode and the second self-supporting layer of the positive electrode, with a weight per unit area of ​​17.8 mg / cm 2 ;

[0061] On one side of the first self-supporting layer of the positive electrode, the first metal conductive layer (metal aluminum layer) with a thickness of 1 μm is vacuum evaporated, and the second metal conductive layer (metal aluminum layer) with a thickness of 1 μm is vacuum evaporated on one side of the second self-supporting layer of the positive electrode. aluminum layer);

[0062] A metal foil strip (aluminum foil) is set between the first metal conductive layer and the second ...

Embodiment 2

[0068] The difference with embodiment 1 is:

[0069] Preparation of positive electrode sheet:

[0070] Mix NCM523 powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE at a ratio of 92:3:3:2, dissolve in a solvent and stir evenly to form a slurry, and coat the slurry on a positive electrode current collector with a thickness of 12 μm On the aluminum foil, dry and roll to form a pole piece with a thickness of 120μm, wherein the coating amount of the slurry per unit area is 17.8mg / cm 2 .

[0071] Preparation of negative electrode sheet:

[0072] Mix artificial graphite powder, SP conductive carbon black, VGCF carbon nanofiber and PTFE in a ratio of 95:1:2:2, then stir and mix evenly at 350°C under inert gas protection conditions to form a block, and put the block Press on a heating plate at 350°C to a thickness of 51 μm to make the first self-supporting layer of the negative electrode and the second self-supporting layer of the negative electrode, with a weight p...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a pole piece which comprises a first self-supporting layer, a first metal conductive layer, a second metal conductive layer and a second self-supporting layer which are sequentially laminated. The first self-supporting layer and the second self-supporting layer respectively comprise an active substance, a conductive agent and a binder. In addition, the invention also relates to a preparation method of the pole piece, a battery cell and a battery. Compared with the prior art, the battery provided by the invention has good safety performance while having high energy density.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a pole piece and a preparation method thereof, a battery cell and a battery. Background technique [0002] Due to its outstanding advantages such as high energy density, excellent cycle life, high working voltage, low self-discharge rate, and environmental friendliness, lithium-ion batteries have become ideal power sources for electric vehicles and energy storage. However, with the improvement of the energy density of positive and negative electrode materials, the safety of lithium-ion batteries has gradually become an important issue restricting its further promotion. [0003] Single cells with high energy density and high capacity are prone to thermal runaway under abuse conditions such as overcharging, overheating, and puncture, which can lead to fire or even explosion accidents, seriously threatening the personal safety of users. The thermal runaway of batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/134H01M4/139H01M4/1395H01M4/62H01M4/66H01M10/0525
CPCH01M4/13H01M4/134H01M4/139H01M4/1395H01M4/621H01M4/624H01M4/667H01M10/0525Y02E60/10
Inventor 姚毅姜斌江柯成
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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