Active material composite, positive electrode active material layer, positive electrode for secondary battery and secondary battery
The active material composite with a radially bound conductive agent and second binder addresses the challenge of achieving high energy density and tensile strength in secondary batteries, particularly with lithium salts like NCA or NCM, improving battery performance and stability.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SAMSUNG SDI CO LTD
- Filing Date
- 2025-01-07
- Publication Date
- 2026-07-17
AI Technical Summary
Existing secondary batteries face challenges in achieving high energy density and high tensile strength in self-supporting electrode sheets, particularly in the manufacturing process using dry methods without solvents, where attaching the electrode composite sheet to the current collector is necessary for productivity and handling.
An active material composite is developed with particulate positive electrode active material, a conductive agent, and a first binder, where the conductive agent is bound radially to the active material surface via the binder, forming a chestnut-like structure, and a second binder is used to enhance mechanical strength, resulting in a self-supporting electrode sheet with improved conductivity and tensile strength.
The composite provides good battery performance and high tensile strength, enhancing the energy density and thermal stability of secondary batteries, particularly when using lithium salts of ternary transition metal oxides like NCA or NCM, reducing metal leaching and improving long-term reliability.
Smart Images
Figure 2026119648000001_ABST