Elektrochemische Vorrichtung und Elektronische Vorrichtung

Details

Veröffentlichungs-Nr.

EP4738521

Anmeldetag

22. Mai 2024

Veröffentlichung

2. Januar 2025

Rechtsraum

EP

Abstract

This application provides an electrochemical device and an electronic device, where the electrochemical device includes an electrode assembly and an electrolyte, where the electrode assembly includes a negative electrode plate, the negative electrode plate includes a negative electrode active material layer, the negative electrode active material layer includes a negative electrode active material and a negative electrode binder, the negative electrode binder includes an ester substance and a non-ester substance, and based on a mass of the negative electrode binder, a mass percentage of the ester substance is x; the electrolyte includes fluoroethylene carbonate and a high-kinetic solvent, the high-kinetic solvent includes at least one of ethyl propionate, propyl propionate, or diethyl carbonate, and a ratio of a mass percentage of fluoroethylene carbonate to a mass percentage of the high-kinetic solvent in the electrolyte is y; and the electrochemical device satisfies: 17% ≤ x + y ≤ 53%, y is from 0.4% to 14%, and based on a mass of the electrolyte, a mass percentage of fluoroethylene carbonate is from 0.1% to 10%. By synergistically controlling x and y, this application mitigates volume expansion and capacity fade during cycling in fast-charging systems, thereby improving cycle performance.

Anmelder

Firma

Ningde Amperex Technology Limited

Land

🇨🇳 China