Positively charged silicon for lithium-ion batteries

US10340516B2 · kind B2 · utility

Assignee

• UMICORE · BE

Inventors

• Stijn Put · Olmen, BE
• Jan Gilleir · Mortsel, BE
• Kris Driesen · Olen, BE
• Jean-Sébastien BRIDEL · Daeheung-dong, KR
• Nicolas MARX · Geel, BE
• Delphine Longrie · Wondelgem, BE
• Dan V. Goia · Potsdam, US
• John I. Njagi · Potsdam, US

Key dates

• Filing date: Mar 9, 2017
• Grant date: Jul 2, 2019
• Expiry date: Dec 29, 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

This invention relates to a negative electrode material for lithium-ion batteries comprising silicon and having a chemically treated or coated surface influencing the zeta potential of the surface. The active material consists of particles or particles and wires comprising a core comprising silicon, wherein the particles have a positive zeta potential in an interval between pH 3.5 and 9.5, and preferably between pH 4 and 9.5. The core is either chemically treated with an amino-functional metal oxide, or the core is at least partly covered with OySiHx groups, with 1<x<3, 1≤y≤3, and x>y, or is covered by adsorbed inorganic nanoparticles or cationic multivalent metal ions or oxides.