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Electrode plate, electrochemical device and electronic device

An electrode pole piece and electrode assembly technology, which is applied in the field of electrochemistry and can solve problems such as cracking and powder dropping.

Active Publication Date: 2021-03-19
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present application provides an electrode pole piece, an electrochemical device and an electronic device, so as to improve the problems of powder dropping, cracking and wrinkling caused by the bending of the electrode pole piece, thereby improving the performance and safety of the electrochemical device

Method used

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  • Electrode plate, electrochemical device and electronic device
  • Electrode plate, electrochemical device and electronic device
  • Electrode plate, electrochemical device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] (1) Preparation of negative electrode sheet

[0095]Negative active material graphite (Graphite), conductive carbon black (Super P), and styrene-butadiene rubber (SBR) were mixed according to a weight ratio of 96:1.5:2.5, and deionized water (H 2 O) as a solvent, prepared into a slurry with a solid content of 0.7, and stirred evenly.

[0096] The slurry is evenly coated on one side of the 10 μm thick negative electrode current collector copper foil, and dried at 110°C; then, the slurry is evenly coated on the other side of the negative electrode current collector copper foil, and dried at 110°C. A sheet having a thickness of 100 μm was obtained.

[0097] The above-mentioned sheet was cut into a plurality of sheet-shaped units with a size of 41 mm×61 mm.

[0098] Laser cleaning is used to etch N grooves on one side of the cut sheet unit, and the N grooves extend along the width direction of the sheet unit and are arranged in sequence along the long side direction of th...

Embodiment 2-20

[0115] In Example 2-20, the preparation process is similar to that of Example 1, except that the values ​​of some parameters are adjusted according to the following Table 1.

Embodiment 21

[0117] (1) Preparation of negative electrode sheet

[0118] Negative active material graphite (Graphite), conductive carbon black (Super P), and styrene-butadiene rubber (SBR) were mixed according to a weight ratio of 96:1.5:2.5, and deionized water (H 2 O) as a solvent, prepared into a slurry with a solid content of 0.7, and stirred evenly.

[0119] The slurry is evenly coated on one side of the 10 μm thick negative electrode current collector copper foil, and dried at 110°C; then, the slurry is evenly coated on the other side of the negative electrode current collector copper foil, and dried at 110°C. A sheet having a thickness of 100 μm was obtained.

[0120] The above-mentioned sheet was cut into a plurality of sheet-shaped units with a size of 41 mm×61 mm.

[0121] Laser cleaning is used to etch N grooves on one side of the cut sheet unit, and the N grooves extend along the long side direction of the sheet unit and are arranged in sequence along the width direction of t...

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Abstract

The invention provides an electrode plate, an electrochemical device and an electronic device. The electrode plate comprises: a current collector which comprises a first surface and a second surface which are located in a bending area, wherein the first surface is concave inwards, and the second surface is convex outwards; and a first active material layer which is located on the first surface andcomprises at least two first units when the bending area is in a flat state, wherein the at least two first units are sequentially arranged in the first direction, and a groove is formed between anytwo adjacent first units. The bending area satisfies the following conditions: 0.7 x R2 / (R2+H) <= L' / L <= R1 / (R1+H), and H is the thickness of the first active material layer; R1 and R2 are the maximum curvature radius and the minimum curvature radius of the surface of the first active material layer respectively; L is the length of the bending area along the first direction when the bending areais in a flat state; and L' is the sum of the lengths of the non-groove regions on the surface of the first active material layer along the first direction when the bending area is in a flat state.

Description

technical field [0001] The present application relates to the field of electrochemical technology, in particular to an electrode pole piece, an electrochemical device and an electronic device. Background technique [0002] As an electrochemical device, a lithium-ion battery mainly relies on the movement of lithium ions between the positive and negative electrodes to work. In recent years, with the development trend of diversification and miniaturization of mobile electronic devices, on the one hand, the volumetric energy density of lithium-ion batteries has become larger and larger; on the other hand, more requirements have been put forward for the shape adaptability of lithium-ion batteries. High requirements, in order to meet product design requirements, curved lithium-ion batteries came into being. [0003] The inventors of the present application have found that the positive pole piece and the negative pole piece of the arc-shaped lithium-ion battery are in a curved sta...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M10/0525H01M10/058
CPCH01M4/13H01M10/0525H01M10/058H01M2004/021Y02E60/10Y02P70/50
Inventor 张楠张益博彭涛胡乔舒
Owner NINGDE AMPEREX TECH
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