Secondary battery and electronic device

By designing the positive electrode structure and adjusting the coverage area ratio S and contact angle θ of the protective layer, and using oleophobic materials to form the protective layer, the corrosion problem of positive electrode tabs and current collectors by fluorosulfonyl group compounds was solved, thereby improving the safety performance and electrochemical stability of lithium-ion batteries.

CN121709690APending Publication Date: 2026-03-20XIAMEN AMPACE TECH LTD
0 Cites 0 Cited by

Patent Information

Application Number
CN202511908647.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-17
Publication Date
2026-03-20

AI Technical Summary

Technical Problem

When compounds containing fluorosulfonyl groups are used in lithium-ion battery electrolytes, they can corrode the positive electrode tabs and positive electrode current collectors, leading to a deterioration in the electrochemical performance of lithium-ion batteries and increasing safety risks.

Method used

The positive electrode structure is designed, a protective layer is set to cover the tab area, and the coverage area ratio S of the protective layer and the contact angle θ with the electrolyte are adjusted within a specific range. An oleophobic material is used to form the protective layer to reduce the contact between the positive electrode tab and the positive current collector and the electrolyte.

Benefits of technology

It reduces the corrosion of the positive electrode tab and positive electrode current collector by the electrolyte, extends the service life of the secondary battery, improves safety performance, reduces the risk of thermal runaway and local overheating, and enhances electrochemical stability.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides a secondary battery and an electronic device. The secondary battery comprises a positive pole piece and electrolyte, the positive pole piece comprises a positive current collector, a positive material layer and a protective layer, the positive material layer and the protective layer are both located on at least one surface of the positive current collector, the positive current collector comprises a main body area and a tab area in the width direction of the positive current collector, the positive material layer is arranged in the main body area, and the tab area is arranged in the main body area. The protective layer is arranged in the tab area; the area proportion of the protective layer covering the tab region is S, 0.6 < = S < = 1, and the contact angle theta between the protective layer and the electrolyte is greater than 90 degrees and less than or equal to 165 degrees. The secondary battery provided by the invention has good safety performance.
Need to check novelty before this filing date? Find Prior Art