Negativelektrodenfolie, Sekundärbatterie und Elektrische Vorrichtung

Details

Veröffentlichungs-Nr.

EP4769507

Anmeldetag

23. Februar 2024

Veröffentlichung

17. April 2025

Rechtsraum

EP

Abstract

The present application provides a negative electrode sheet, a secondary battery, and an electric device. The negative electrode sheet includes a negative electrode current collector, a buffer layer, and an active layer, where the buffer layer is located between the negative electrode current collector and the active layer; the buffer layer includes a first binder; and an active material of the active layer includes silicon-carbon composite particles, and the silicon-carbon composite particles include a porous carbon material and a silicon material located in pores of the porous carbon material. The introduction of the silicon-carbon composite particles in the active layer can provide a good basis for improving the energy density of a battery. In addition, the buffer layer including the first binder is disposed between the negative electrode current collector and the active layer, so that an acting force of the silicon-carbon composite particles on the negative electrode current collector in a cold pressing process can be buffered, a risk of damage to the negative electrode current collector caused by the silicon-carbon composite particles can be reduced, and then the negative electrode current collector can maintain good structural stability, thereby improving cycle performance of the battery.

Anmelder

Firma

Contemporary Amperex Technology Co., Limited

Land

🇨🇳 China