Electrode sheet and lithium-ion battery

The electrode sheet with grooved active layers and optimized material properties addresses the challenge of maintaining high cycle performance during fast charging by reducing the active layer thickness around the tab connection, thereby reducing the charging risk and improving the cycle retention rate of lithium-ion batteries.

JP7763232B2Active Publication Date: 2025-10-31ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Application Number
JP2023500035
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-12-30
Filing Date
2021-12-30
Publication Date
2025-10-31
Estimated Expiration
2041-12-30

AI Technical Summary

Technical Problem

Existing lithium-ion batteries face challenges in maintaining high cycle performance while supporting fast charging due to increased current density around the tab position, leading to lithium ion precipitation and degradation.

Method used

The electrode sheet design includes a first and second active layer with grooves, where the second groove covers the first, and a tab is connected to the current collector within the first groove, with specific dimensions and material properties to reduce active layer thickness and improve cycle performance.

Benefits of technology

The design effectively reduces charging risks and enhances cycle retention rates of lithium-ion batteries during fast charging by minimizing active layer thickness around the tab connection.

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Abstract

The present invention provides an electrode sheet and a lithium-ion battery. The electrode sheet provided in a first aspect of the present invention includes a current collector and a first active layer and a second active layer stacked in order on the surface of the current collector, where a first groove is formed in the first active layer and a second groove is formed in the second active layer, the vertical projection of the second groove onto the current collector covers the vertical projection of the first groove onto the current collector, and a tab is provided in the first groove and electrically connected to the current collector. The electrode sheet provided in the present invention effectively reduces charging risk at the tab connection position and improves the cycle retention rate of the lithium-ion battery under conditions of maintaining high-speed charging.
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