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Electrodes and Batteries

A technology of electrode sheets and batteries, which is applied in the direction of secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of low liquid storage capacity of batteries, easy deformation of batteries, and small expansion space of wound electrode sheets. Achieve the effect of ensuring volumetric energy density, improving flatness, and reducing expansion and deformation

Active Publication Date: 2022-04-12
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present application provides an electrode sheet and a battery to solve the problem that the winding electrode sheet has a small expansion space, which makes the cell easily deformed during the cycle and the battery cell has a low liquid storage capacity.

Method used

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  • Electrodes and Batteries
  • Electrodes and Batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this embodiment, the electrode sheet is a negative electrode sheet. The active material layer 20 is at least one of graphite, silicon, silicon oxide, and silicon carbon. The current collector 10 is copper foil. The bump layer 30 is composed of organic conductive particles and a binder, and the organic particles include at least one of conductive carbon black, polyethylene, polypropylene, polyacetylene, polypropylene, and polystyrene; the binder The binder is sodium carboxymethyl cellulose, polystyrene butadiene rubber, polyacrylic acid, styrene butadiene rubber SBR, nitrile rubber, butadiene rubber, modified styrene butadiene rubber, sodium polyacrylate PAANa, water-based polyacrylonitrile copolymer at least one of .

[0045] Furthermore, said A=5um, B=1um, and C=0.2um. Wherein, A represents the thickness of the protruding point layer 30 near the end of the tab 40, B represents the thickness of the protruding point layer 30 away from the end of the tab 40, and C r...

Embodiment 2

[0054] In this embodiment, the electrode sheet is a positive electrode sheet. The active material layer 20 is at least one of lithium cobalt oxide and lithium nickel cobalt manganese oxide. The current collector 10 is aluminum foil. The bump layer 30 is composed of organic conductive particles and a binder, and the organic particles include at least one of conductive carbon black, polyethylene, polypropylene, polyacetylene, polypropylene, and polystyrene; the binder The binder is polyvinyl difluoride.

[0055] Furthermore, said A=5um, B=1um, and C=0.2um. Wherein, A represents the thickness of the first end of the protruding point layer, B represents the thickness of the second end of the protruding point layer, and the first end of the protruding point layer is close to the first end of the current collector Set, the second end of the protruding point layer is set away from the first end of the current collector.

[0056] The preparation method of the negative electrode sh...

Embodiment 3

[0064] The electrode sheet in this embodiment is basically the same as the electrode sheet provided in Example 1, and the battery in this example is basically the same as the battery provided in Example 1. The difference is that in this example, the A=7um , B=1um, C=0.2um.

[0065] A cycle test was performed on the battery provided in Example 3. At 25°C, the battery was charged to the rated voltage at a rate of 1C and then discharged at a rate of 1C. Both charge and discharge were cut off at a rate of 0.05C, and the number of cycles was 600 times. The test results are shown in the table below, where the liquid retention capacity is determined by measuring the weight of the battery before liquid injection and after two seals:

[0066] Liquid retention (g) Energy density (Wh / L) Capacity retention Is the cycle battery deformed? 5.67 758 86.9％ Undeformed

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Abstract

The present application provides an electrode sheet and a battery, the electrode sheet includes a current collector, the current collector includes a first surface and a second surface opposite to each other, at least one of the first surface and the second surface An active material layer is provided, and the side of the active material layer away from the current collector is provided with a protruding point layer, and the thickness of the protruding point layer is from the first end of the current collector to the second end of the current collector. The two ends are decreasing, the first end of the current collector and the second end of the current collector are two opposite ends of the current collector. The embodiment of the present application can solve the problem that the winding electrode sheet has a small expansion space, which makes the cell easily deformed during the cycle and the battery cell has a low liquid storage capacity.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to an electrode sheet and a battery. Background technique [0002] As we all know, lithium-ion batteries have become energy storage devices for mainstream electronic products. With the improvement of people's requirements for batteries, a lithium-ion battery with excellent performance must have a high energy density and a long cycle life. At present, the process of preparing lithium-ion batteries is usually to wind the positive and negative electrode sheets into a core, after hot pressing, inject liquid, and form. In order to increase the energy density as much as possible, the positive and negative electrode sheets and the separator are usually bonded together. It is more compact, but this will result in less expansion space for the electrode sheet, making the cell easily deformed during the cycle, and the liquid storage capacity of the cell is lower. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M10/0525H01M10/0587
CPCH01M4/13H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 韦世超彭冲陈博李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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