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Electrode sheet and electrochemical device

An electrode sheet and non-electrode technology, which is applied in the field of electrochemical energy storage devices, can solve problems such as weak adhesion between the active material layer and the current collector, affecting the cycle performance of the electrochemical device, and limited improvement in the safety of the electrochemical device. Achieve the effects of improving conductivity and energy density, preventing fire and explosion, and preventing coating peeling

Active Publication Date: 2022-03-01
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main means to improve the safety of electrochemical devices include introducing an active material layer with poor conductivity into the positive electrode sheet, and using a composite current collector with a polymer layer added, etc., but the current solutions will affect the performance of the electrochemical device such as cycleability , and the bonding force between the active material layer and the current collector is weak, and the improvement of the safety of the electrochemical device is also relatively limited.

Method used

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  • Electrode sheet and electrochemical device
  • Electrode sheet and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Preparation of positive electrode sheet

[0052] Add carbon black, polyacrylic acid, and polytetrafluoroethylene particles into the planetary mixer in sequence, and add water as a solvent to it, and disperse evenly to make the first slurry; among them, carbon black, polyacrylic acid, polytetrafluoroethylene The mass ratio of ethylene particles is 20:50:30;

[0053] Then use a 150-mesh gravure coater to coat the first slurry on the front and back surfaces of the aluminum foil at a coating speed of 50m / min. After the coating is completed, place it in an oven and dry at 95°C to form a first coat;

[0054] Add lithium iron phosphate, barium sulfate, carbon black, carbon tubes, and PVDF into the planetary mixer in sequence, and add N-methylpyrrolidone (NMP) therein as a solvent, and after dispersing evenly, make a second slurry; , the mass ratio of lithium iron phosphate, barium sulfate, carbon black, carbon tube and PVDF is 70:22:2:1:5;

[0055]Then use a 110-mesh gra...

Embodiment 2～ Embodiment 6

[0063] The difference between embodiment 2 and embodiment 1 is that the thickness of the first coating is 0.7 μm, and all the other conditions are basically the same as embodiment 1;

[0064] The difference between embodiment 3 and embodiment 1 is that the thickness of the first coating is 1.8 μm, and all the other conditions are basically the same as embodiment 1;

[0065] The difference between embodiment 4 and embodiment 1 is that aluminum oxide is used to replace barium sulfate, and all the other conditions are basically the same as embodiment 1;

[0066] The difference between embodiment 5 and embodiment 1 is that the mass ratio of carbon black, polyacrylic acid, and polytetrafluoroethylene particles is 40:30:30, and all the other conditions are substantially the same as embodiment 1;

[0067] The difference between Example 6 and Example 1 is that the mass ratio of carbon black, polyacrylic acid, and polytetrafluoroethylene particles is 10:60:30, and the rest of the condi...

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Abstract

The invention provides an electrode plate and an electrochemical device, the electrode plate comprises a current collector and a functional coating located on at least one surface of the current collector, and the functional coating comprises a first coating, a second coating and an active material layer which are sequentially stacked on the surface of the current collector; the first coating comprises a conductive agent, a binder and a first functional filler; the second coating comprises a conductive agent, a binder and a second functional filler; the mass ratio of the binder in the first coating to the first coating is a1, the mass ratio of the binder in the second coating to the second coating is a2, the mass ratio of the binder in the active substance layer to the active substance layer is a3, and a1 > a2 > a3. According to the invention, the safety, cyclicity and other performances of the electrochemical device can be improved.

Description

technical field [0001] The invention relates to an electrode sheet and an electrochemical device, belonging to the field of electrochemical energy storage devices. Background technique [0002] At present, electrochemical devices such as lithium-ion batteries have been widely used in consumer electronics, travel tools, and energy storage. Among them, lithium-ion batteries have the advantages of high energy density, fast charge and discharge speed, and long service life, and have gradually become the current mainstream. Research hotspots. However, in recent years, electrochemical devices such as lithium-ion batteries have been frequently exposed to fire and failure, and there are certain safety hazards. The electrochemical device generally includes a positive electrode sheet, a negative electrode sheet, and a diaphragm separating the positive electrode sheet and the negative electrode sheet. Wherein, the contact short circuit between the positive electrode sheet and the nega...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/48H01M4/60H01M4/62H01M4/66
CPCH01M4/13H01M4/66H01M4/621H01M4/602H01M4/48Y02E60/10H01M4/136H01M4/131H01M4/625H01M4/623H01M2004/028H01M4/366H01M2004/021H01M10/4235H01M4/62H01M4/622H01M4/139H01M10/0525
Inventor 杨帆翟艳云张健谢孔岩刘芬杨锦帅彭冲
Owner ZHUHAI COSMX BATTERY CO LTD
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