Interconnected silicon porous structure for anode active material

US11223036B2 · kind B2 · utility

Assignee

• Apple Inc. · US

Inventors

• Zuqin Liu · Sunnyvale, US
• Richard M. Mank · Los Altos, US
• Hyea Kim · Atlanta, US
• Hongli Dai · Los Altos, US
• Sunho Kang · San Jose, US
• Ji-Guang Zhang · Richland, US
• Ran Yi · Richland, US
• Qiuyan Li · Richland, US
• Xiaolin Li · San Diego, US
• Wu Xu · Richland, US
• Rajankumar Patel · Pasco, US
• Hyung-Seok Lim · Richland, US
• Chongmin Wang · Richland, US
• Langli Luo · Richland, US
• Yang He · Sichuan, CN

Key dates

• Filing date: Nov 18, 2019
• Grant date: Jan 11, 2022
• Expiry date: Jul 29, 2040

Classification

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

Abstract

An anode active material comprises a silicon-carbon secondary particle comprising a composite having an exterior conformal carbon coating and formed of type I primary particles. Each type I primary particle comprises a core particle of interconnected silicon, the interconnected silicon formed of nano-sized silicon particles each connected to at least one other particle, inner pores internal to the core particle and defined by the interconnected silicon, an internal carbon coating on internal wall surfaces of the inner pores and a conformal carbon coating on the core particle.