Production of Si/C composite particles

US10968106B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Dennis Troegel · Maisach, DE
• Jelena Pantelic-Seidl · Germering, DE

Key dates

• Filing date: Aug 11, 2016
• Grant date: Apr 6, 2021
• Expiry date: Oct 28, 2036

Classification

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

Abstract

The invention provides processes for producing precomposite particles by mixing silicon particles, polyacrylonitrile and one or more carbon additives (C additives) based on one carbon polymorph, optionally one or more organic pore formers and optionally one or more inorganic additives, each in the form of a powder, wherein no solvent is added before and during the mixing, and the inorganic additives are selected from the group comprising halides of the alkali metals and alkaline earth metals, carbonates of the alkali metals, zinc oxide, magnesium carbonate and nickel sulfide, wherein the polyacrylonitrile, the silicon, particles and/or the C additives are wholly or partly initially charged prior to the mixing or are wholly or partly metered in during the mixing, with the proviso that, without polyacrylonitrile in the initial charge, the silicon particles and/or the C additives are at least partly metered in together with polyacrylonitrile or after addition of polyacrylonitrile. The invention further provides processes for producing Si/C composite particles, characterized in that the aforementioned precomposite particles are subjected to thermal treatment.