Composite electrode and lithium-ion battery comprising same and method for producing the composite electrode

US10637045B2 · kind B2 · utility

Assignee

• Bayerische Motoren Werke Aktiengesellschaft · DE

Inventors

• Thomas Woehrle · Munich, DE
• Matthias Tschech · Munich, DE
• Thomas Hoefler · Stuttgart, DE
• Sung Jin Kim · Suwon-si, KR
• Sebastian SCHARNER · Fürstenfeldbruck, DE
• Jens Vetter · Würenlingen, CH
• Jan-Oliver ROTH · Erding, DE
• Tobias Zeilinger · Palo Alto, US
• Matthias Wagner · Cambridge, US

Key dates

• Filing date: Jul 19, 2017
• Grant date: Apr 28, 2020
• Expiry date: Dec 10, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/10
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A composite electrode is provided having a collector, the collector is coated with an electrode composition containing an active electrode material, a binding agent, and a conductivity additive such as conductive carbon black. The electrode composition has a concentration gradient along the direction of the electrode thickness in respect of the active electrode material and the conductivity additive, with the concentration gradient of the active electrode material increasing toward the collector, and the concentration gradient of the conductivity additive and the binder decreasing toward the collector. Two different methods of producing the composite electrode are also provided. A lithium-ion battery is further provided which includes a composite electrode having a collector, the collector is coated with an electrode composition containing an active electrode material, a binding agent, and a conductivity additive.