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Positive plate and lithium ion battery

A technology of positive electrode sheet and positive active material, which is applied in the field of positive electrode sheet and lithium-ion battery, can solve problems such as battery damage, and achieve the effect of avoiding battery damage and improving safety

Pending Publication Date: 2021-12-10
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the embodiments of the present invention is to provide a positive electrode sheet and a lithium-ion battery, aiming to solve the technical problem that the battery is damaged due to burrs on the electrode sheet and oxidation of the electrolyte during the preparation and use of the battery.

Method used

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  • Positive plate and lithium ion battery
  • Positive plate and lithium ion battery
  • Positive plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] An aluminum foil with a thickness of 10 microns was used as the positive electrode current collector, and the above positive electrode current collector had a multi-tab structure. The positive electrode active material coating is prepared by using the positive electrode active material, the conductive agent and the binder according to the ratio of 96:1.5:2.5. The mixed coating was prepared according to the ratio of ceramics and anti-oxidation components at 7:3.

[0061] The mixed coating is coated on the first coating area 10 of the positive current collector, and the positive active material coating is coated on the second coating area 20 of the positive current collector, wherein a coating device can be used on the positive current collector to simultaneously The first coating area 10 and the second coating area 20 are coated. The mixed coating is applied to the third coating area 31 of the tab 30 . Wherein, the width of the first coating area 10 is set to be 1.5 mm...

Embodiment 2

[0066] An aluminum foil with a thickness of 10 microns was used as the positive electrode current collector, and the above positive electrode current collector had a wound structure. The positive electrode active material coating is prepared by using the positive electrode active material, the conductive agent and the binder according to the ratio of 96:1.5:2.5. The mixed coating was prepared according to the ratio of ceramics and anti-oxidation components at 7:3.

[0067] The mixed coating is coated on the first coating area 10 of the positive electrode current collector, and the positive electrode active material coating is coated on the second coating area 20 of the positive electrode current collector. One coating area 10 is coated, and then the second coating area 20 of the positive current collector is coated. The width of the first coating area 10 is set to be 105 mm.

[0068] The positive electrode sheet is obtained after drying, rolling, slitting and die-cutting the...

Embodiment 3

[0072] An aluminum foil with a thickness of 10 microns was used as the positive electrode current collector, and the above positive electrode current collector had a multi-tab structure. The positive electrode active material coating is prepared by using the positive electrode active material, the conductive agent and the binder according to the ratio of 96:1.5:2.5. The mixed coating was prepared according to the ratio of ceramics and anti-oxidation components at 7:3.

[0073] Coating the positive electrode active material coating on the second coating area 20 of the positive electrode current collector, coating the mixed coating on the first sub-coating area 11 of the positive electrode current collector, and coating the second sub-coating area 12 of the positive electrode current collector Apply the mixed positive electrode active material coating and the mixed coating, and coat the mixed coating on the third coating area 31 of the tab 30 . Wherein, the width of the second ...

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Abstract

The invention provides a positive plate and a lithium ion battery, the positive plate comprises a current collector and a tab, the tab is arranged in at least one side of the current collector, the current collector comprises a first coating area arranged close to the tab and a second coating area arranged at one side of the first coating area far away from the tab, and the width of the first coating area is smaller than that of the second coating area; wherein the first coating area is coated with a mixed coating, the second coating area is coated with a positive active material coating, and the mixed coating comprises ceramic and an anti-oxidation component. In the embodiment of the invention, the second coating area is coated with the mixed coating, ceramic in the mixed coating can prevent burrs from being generated on the surface of the pole piece, and the anti-oxidation component in the mixed coating can absorb gas generated after the electrolyte is oxidized, so that the safety of the battery in the preparation and use process is improved, and the battery is prevented from being damaged.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode sheet and a lithium ion battery. Background technique [0002] During the process of slitting and die-cutting the positive electrode sheet, burrs are easily formed on the surface of the positive electrode sheet. In this way, after the battery is prepared, the burr may pierce the separator, resulting in an internal short circuit of the battery. At the same time, during the charging and discharging process of the battery, the electrolyte may oxidize and produce gas at the positive electrode, which may easily lead to a loose fit between the battery electrodes and may cause battery damage. [0003] To sum up, during the preparation and use of the battery, the burr on the pole piece and the oxidation of the electrolyte caused the battery to be damaged. Contents of the invention [0004] The main purpose of the embodiments of the present invention is to provid...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/13H01M4/70H01M50/531
CPCH01M4/02H01M4/13H01M4/70H01M50/531H01M2004/028Y02E60/10
Inventor 王洛
Owner ZHUHAI COSMX BATTERY CO LTD
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