Annealed garnet electrolyte separators

US11581576B2 · kind B2 · utility

Assignee

• QUANTUMSCAPE BATTERY, INC. · US

Inventors

• Arnold Allenic · San Jose, US
• Cheng-Chieh Chao · San Jose, US
• Lei Cheng · Kunshan, CN
• Niall Donnelly · San Jose, US
• William H. Gardner · Waltham, US
• Tim Holme · San Jose, US
• Sriram Iyer · Cupertino, US
• Shuang Li · Sunnyvale, US

Key dates

• Filing date: Sep 28, 2021
• Grant date: Feb 14, 2023
• Expiry date: Sep 28, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/50
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Set forth herein are pellets, thin films, and monoliths of lithium-stuffed garnet electrolytes having engineered surfaces. These engineered surfaces have a list of advantageous properties including, but not limited to, low surface area resistance, high Li+ ion conductivity, low tendency for lithium dendrites to form within or thereupon when the electrolytes are used in an electrochemical cell. Other advantages include voltage stability and long cycle life when used in electrochemical cells as a separator or a membrane between the positive and negative electrodes. Also set forth herein are methods of making these electrolytes including, but not limited to, methods of annealing these electrolytes under controlled atmosphere conditions. Set forth herein, additionally, are methods of using these electrolytes in electrochemical cells and devices. The instant disclosure further includes electrochemical cells which incorporate the lithium-stuffed garnet electrolytes set forth herein.