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Electrochemical device and electronic device

An electrochemical, edge zone technology, applied in the field of electronics, to avoid the risk of spontaneous combustion or explosion, improve safety, and prolong service life

Pending Publication Date: 2022-03-01
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, electrochemical devices, such as lithium-ion batteries, are widely used in various fields. With the change of operating conditions, the requirements for the safety of electrochemical devices are gradually increasing. The safety of current electrochemical devices is expected to be further improved. Improve

Method used

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  • Electrochemical device and electronic device
  • Electrochemical device and electronic device
  • Electrochemical device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of the positive electrode: Dissolve the positive electrode material lithium cobaltate (gram capacity: 181mAh / g), conductive carbon black, and binder polyvinylidene fluoride (PVDF) in N-formazan at a weight ratio of 97.6:1.1:1.3 In the base pyrrolidone (NMP) solution, the positive electrode slurry was formed. Using aluminum foil as the positive electrode collector, the positive electrode slurry is coated on the positive electrode collector, and the coating amount is 18.69mg / cm 2 , after drying, cold pressing, and cutting, the positive electrode is obtained. The compacted density of the positive active material layer during the cold pressing process is 4.15g / cm 3 , the width W4 of the positive electrode after slitting is 92mm.

[0047] Preparation of negative electrode sheet: 20% SiO x Material (gram capacity is 1545mAh / g) and 80% graphite material (gram capacity is 355mAh / g), dispersant (sodium carboxymethyl cellulose) and binder acrylate, conductive agent ...

Embodiment 2

[0052] The difference between Example 2 and Example 1 lies in the preparation of the negative electrode, and the rest of the steps are the same.

[0053] Embodiment 2 40% SiOx material (gram capacity is 1545mAh / g) and 60% graphite material (gram capacity is 355mAh / g), dispersant (sodium carboxymethyl cellulose) and binder acrylate, conductive agent ( Conductive carbon black, CNT) is dissolved in deionized water at a ratio of 93.0:1.0:5.5:0.5 by weight to form slurry 1; 100% graphite material (355mAh / g in gram capacity), binder styrene-butadiene rubber, The conductive agent (conductive carbon black, CNT) was dissolved in deionized water at a weight ratio of 97.7:0.6:0.7 to form slurry 2. Copper foil with a thickness of 10 μm was used as the negative electrode current collector, and slurry 2 was preferentially coated on the negative electrode current collector, and the coating amount was 9.83 mg / cm 2 , dried to obtain the negative electrode active material layer 2, and then the...

Embodiment 3

[0055] The difference between Example 3 and Example 1 lies in the preparation of the negative electrode, and the rest of the steps are the same.

[0056] Embodiment 3 80% SiOx material (gram capacity is 1545mAh / g) and 20% graphite material (gram capacity is 355mAh / g), dispersion agent (sodium carboxymethyl cellulose) and binding agent acrylate, conductive agent ( Conductive carbon black, CNT) is dissolved in deionized water according to the ratio of 88.5:1.5:8.0:2.0 by weight to form slurry 1; 100% graphite material (gram capacity is 355mAh / g), binder styrene-butadiene rubber, The conductive agent (conductive carbon black, CNT) was dissolved in deionized water at a weight ratio of 97.7:0.6:0.7 to form slurry 2. Copper foil with a thickness of 10 μm was used as the negative electrode current collector, and slurry 2 was preferentially coated on the negative electrode current collector, and the coating amount was 9.83 mg / cm 2 , dried to obtain the negative electrode active mater...

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Abstract

The invention provides an electrochemical device and an electronic device. In some embodiments of the present disclosure, an electrochemical device is presented, comprising: a negative electrode comprising a negative electrode current collector and a negative electrode active material layer on one side or both sides of the negative electrode current collector; in the width direction of the negative electrode current collector, the negative electrode active material layer comprises an edge region and a target region, and the edge region is close to the side edge of the negative electrode current collector; the capacity per unit area of the edge area is A, the capacity per unit area of the target area is B, and A is greater than B. According to the embodiment of the invention, the safety of the electrochemical device can be improved.

Description

technical field [0001] The present disclosure relates to the field of electronic technology, and in particular to an electrochemical device and an electronic device. Background technique [0002] At present, electrochemical devices, such as lithium-ion batteries, are widely used in various fields. With the change of operating conditions, the requirements for the safety of electrochemical devices are gradually increasing. The safety of current electrochemical devices is expected to be further improved. Improve. Contents of the invention [0003] In view of the disadvantages of the prior art described above, an object of the present disclosure is to provide an electrochemical device and an electronic device. [0004] In some embodiments of the present disclosure, an electrochemical device is proposed, comprising: a negative electrode, the negative electrode includes a negative electrode current collector and a negative electrode active material layer located on one side or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525H01M50/40
CPCH01M4/13H01M10/0525H01M50/40Y02E60/10
Inventor 王强
Owner NINGDE AMPEREX TECH
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