Abstract: The invention relates to composite core-shell particles wherein the core is a porous, carbon-based matrix which contains silicon particles enclosed in pores of the matrix; the pores containing the silicon particles have a diameter of ?60 nm as determined by scanning electron microscopy (SEM); the shell can be obtained by carbonizing one or more carbon precursors selected from among the group comprising tars, pitches, hard carbon, soft carbon and hydrocarbons having 1 to 20 carbon atoms, resulting in a non-porous shell.

Abstract: The invention relates to methods for producing Si/C composite particles, characterised in that mixtures containing silicon particles, one or more oxygen-free polymers, one or more carbon additives based on a carbon modification and one or more liquid dispersing agents are dried by spray drying and the pre-composite particles thus obtained are thermally treated.

Abstract: Composite Si/C particles containing silicon particles located within pores of a carbonaceous matrix are prepared by coating silicon particles with a sacrificial coating layer followed by coating with an organic carbon precursor to form precomposite particles. Thermal treating of the precomposite particles carbonizes the organic carbon precursor and releases the sacrificial material. The composite particles are useful in lithium ion battery anodes.

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.

Abstract: The invention relates to methods for producing Si/C composite particles by a) coating silicon particles with one or more organic or inorganic sacrificial materials, b) coating the products from step a) with one or more organic carbon precursors to form pre-composites, c) thermally treating the pre-composites from step b), wherein the coating based on organic carbon precursors that was produced in step b) is carbonized and the organic or inorganic sacrificial material is partially or completely released from the pre-composites to form porous composites, and d) coating the porous composites from step c) with one or more carbon coatings, which leads to the Si/C composite particles.

Abstract: The invention relates to silicon/graphite/carbon composites (Si/G/C-composites), containing graphite (G) and non-aggregated, nanoscale silicon particles (Si), wherein the silicon particles are embedded in a carbon matrix (C). The invention also relates to a method for producing said type of composite, electrode material for lithium ion batteries containing said type of composite and to a lithium ion battery.

Abstract: The invention relates to methods for producing Si/C composite particles, characterised in that mixtures containing silicon particles, one or more oxygen-free polymers, one or more carbon additives based on a carbon modification and one or more liquid dispersing agents are dried by spray drying and the pre-composite particles thus obtained are thermally treated.

Abstract: The invention relates to composite core-shell particles wherein the core is a porous, carbon-based matrix which contains silicon particles enclosed in pores of the matrix; the pores containing the silicon particles have a diameter of ?60 nm as determined by scanning electron microscopy (SEM); the shell can be obtained by carbonizing one or more carbon precursors selected from among the group comprising tars, pitches, hard carbon, soft carbon and hydrocarbons having 1 to 20 carbon atoms, resulting in a non-porous shell.

Abstract: The invention relates to silicon/graphite/carbon composites (Si/G/C-composites), containing graphite (G) and non-aggregated, nanoscale silicon particles (Si), wherein the silicon particles are embedded in a carbon matrix (C). The invention also relates to a method for producing said type of composite, electrode material for lithium ion batteries containing said type of composite and to a lithium ion battery.

Abstract: The invention relates to a process for producing an Si/C composite, which includes providing an active material containing silicon, providing lignin, bringing the active material into contact with a C precursor containing lignin and carbonizing the active material by converting lignin into inorganic carbon at a temperature of at least 400° C. in an inert gas atmosphere. The invention further provides an Si/C composite, the use thereof as anode material in lithium ion batteries, an anode material for lithium ion batteries which contains such an Si/C composite, a process for producing an anode for a lithium ion battery, in which such an anode material is used, and also a lithium ion battery which includes an anode having an anode material according to the invention.

Abstract: The aluminum content of neopentasilane is reduced by treatment with organic compounds D which contain N, O, and/or S atoms and which have free electron pairs on these atoms.

Abstract: The aluminum content of neopentasilane is reduced by treatment with organic compounds D which contain N, O, and/or S atoms and which have free electron pairs on these atoms.