ZnO nanoparticle coated exfoliated graphite composite, method of producing composite and use in Li-ion battery

US11594723B2 · kind B2 · utility

Assignee

• ECKART GmbH · DE

Inventors

• Olga Isakin · Hartenstein, DE
• Kerstin Schindler · Rederscheid, DE
• Ralph Schneider · Achern, DE
• Ralf Moos · Friedrichshafen, DE
• Monika Willert-Porada · Bayreuth, DE

Key dates

• Filing date: Dec 21, 2017
• Grant date: Feb 28, 2023
• Expiry date: Dec 21, 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

Composites comprising an exfoliated graphite support material having a degree of graphitization g in an range of 50 to 93%, obtained by XRD Rietveld analysis, which is coated with ZnO nanoparticles. These composites are produced by three different methods: A) (syn) the method comprises the following consecutive steps: i) a Zn(II)salt is dissolved in a solvent ii) graphite and a base are added simultaneously iii) the mixture is stirred under impact of ultrasound iv) the solvent is removed from the suspension or B) (pre) the method comprises the following consecutive steps: i) graphite is suspended in a solvent and exfoliated via impact of ultrasound ii) a Zn(II)salt and a base are added simultaneously forming nano-ZnO particles iii) the mixture is stirred iv) the solvent is removed from the suspension or C) (post) the method comprises the following steps: i) a Zn(II)salt and a base are mixed in a solvent in a first reactor forming nano-ZnO particles ii) graphite is exfoliated via impact of ultrasound in a second reactor iii) both suspensions of i) and ii) are mixed together iv) after step iii) the solvent is removed from the suspension. These coated composites may be tempered in a f…