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Electrochemical devices and electronic devices

An electrochemical and conductive layer technology, applied in the field of energy storage, can solve problems such as reducing the safety of cells

Active Publication Date: 2021-07-06
DONGGUAN POWERAMP TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium dendrites will puncture the separator between the negative pole piece and the positive pole piece, resulting in direct contact between the positive pole piece and the negative pole piece, resulting in an electrochemical short circuit, thereby reducing the safety of the cell

Method used

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  • Electrochemical devices and electronic devices
  • Electrochemical devices and electronic devices
  • Electrochemical devices and electronic devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9 and comparative example 1-9

[0111] Embodiments 1-9 only relate to the subregional arrangement of the positive pole piece, but not the subregional arrangement of the negative pole piece. Through sub-area setting, Embodiments 1-9 satisfy that the impedance value of the first positive region is greater than the impedance value of the second positive region.

Embodiment 1

[0113] (1) Preparation of slurry

[0114] Positive single crystal / polycrystalline LiNi 0.8 co 0.1 mn 0.1 o 2 Slurry: the positive active ingredient LiNi 0.8 co 0.1 mn 0.1 o 2 Single crystal / polycrystalline particles, conductive agent Super-P and binder polyvinylidene fluoride PVDF are mixed in a weight ratio of 97%:1.5%:1.5%, and diluted with an appropriate amount of N-methylpyrrolidone, and then mixed in a vacuum mixer Stir to form a homogeneous cathode slurry.

[0115] Negative electrode graphite slurry: mix positive active component graphite, binder styrene-butadiene rubber SBR and dispersant carboxymethyl cellulose CMC by 97%: 1%: 2% by weight, and dilute with appropriate amount of distilled water, then in a vacuum mixer Stir to form a uniform negative electrode slurry.

[0116] (2) Positive electrode partition coating

[0117] Positive electrode partition coating: perform partition coating as follows,

[0118] A, the single crystal LiNi prepared in the step (1)...

Embodiment 2-9

[0130] The difference between embodiment 2-9 and embodiment 1 is only: adopt the active material (embodiment 2) of different particle size, through the active material (embodiment 3) of different carbon content coating, add the conductive agent of different content ( Examples 4 and 5), positive electrode active materials with different kinetic properties (Examples 6-8) and different conductive layers (Example 9) respectively form the positive electrode first region and the positive electrode second region, please refer to Table 1 for details.

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Abstract

An electrochemical device includes an electrode assembly. The electrode assembly includes a negative pole piece, a positive pole piece and a separator. Negative electrode sheet, separator and positive electrode sheet are stacked and wound. The negative electrode sheet includes a negative electrode current collector, and the negative electrode current collector includes a first part and a second part. A first negative electrode active material layer is provided on one side of the first part. The second negative electrode active material layer and the third negative electrode active material layer are respectively provided on both sides of the second part. The positive pole piece includes a positive current collector, and the positive current collector includes a third part and a fourth part. The first positive electrode active material layer is arranged on the third part, and the second positive electrode active material layer is arranged on the fourth part. The ratio of the impedance values ​​of the negative first region to the positive first region is smaller than the impedance ratio of the negative second region to the positive second region. The application also provides an electronic device. The present application can reduce the risk of lithium analysis by coating on one side of the head of the negative pole piece.

Description

technical field [0001] The present application relates to the field of energy storage technology, in particular to an electrochemical device and an electronic device. Background technique [0002] With the popularity of consumer electronics products such as notebook computers, mobile phones, handheld game consoles, tablet computers, power banks and drones, people have increasingly stringent requirements on electrochemical devices (eg, lithium-ion batteries). [0003] However, the safety of electrochemical devices still cannot be effectively guaranteed. For example, after a long-term charge-discharge cycle of a lithium-ion battery, lithium will precipitate on the surface of the electrode sheet of the lithium-ion battery, especially the surface of the negative electrode sheet, forming lithium dendrites. Lithium dendrites will puncture the separator between the negative pole piece and the positive pole piece, resulting in direct contact between the positive pole piece and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 王慧鑫丰炳梅卞春花汪颖
Owner DONGGUAN POWERAMP TECH LTD