A method for producing forsterite microparticles having a primary particle size of 1, to 50 nm, as determined through electron microscopy. The method includes spray-drying, in an atmosphere of 50° C. or higher and lower than 300° C., a solution containing a water-soluble magnesium salt and colloidal silica at a mole ratio of magnesium atoms to silicon atoms (Mg/Si) of 2; and subsequently, firing the spray-dried product in air at 800 to 1,000° C.

A method for producing forsterite microparticles having a primary particle size of 1, to 50 nm, as determined through electron microscopy. The method includes spray-drying, in an atmosphere of 50° C. or higher and lower than 300° C., a solution containing a water-soluble magnesium salt and colloidal silica at a mole ratio of magnesium atoms to silicon atoms (Mg/Si) of 2; and subsequently, firing the spray-dried product in air at 800 to 1,000° C.

Methods for making a synthetic mineral and methods for making synthetic mineral precursors and the products of said methods.

Methods for making a synthetic mineral and methods for making synthetic mineral precursors and the products of said methods.

Provided are a silicon composite negative electrode material and a preparation method therefor, and a lithium ion battery. The silicon composite negative electrode material comprises silicon composite particles and a carbon coating layer, wherein the carbon coating layer is coated on at least part of the surface of the silicon composite particle; and the silicon composite particle comprises silicon, a silicon oxide SiO.sub.x and a silicate containing the metal element M, wherein 0<x<2. The method comprises: condensing a silicon source vapor and a vapor containing the metal element M at 700-900° C. under a vacuum to obtain a silicon composite, the silicon composite comprising a silicon oxide SiO.sub.x and a silicate, wherein 0<x<2; and post-processing the silicon composite to obtain a silicon composite negative electrode material.

Provided are a silicon composite negative electrode material and a preparation method therefor, and a lithium ion battery. The silicon composite negative electrode material comprises silicon composite particles and a carbon coating layer, wherein the carbon coating layer is coated on at least part of the surface of the silicon composite particle; and the silicon composite particle comprises silicon, a silicon oxide SiO.sub.x and a silicate containing the metal element M, wherein 0<x<2. The method comprises: condensing a silicon source vapor and a vapor containing the metal element M at 700-900° C. under a vacuum to obtain a silicon composite, the silicon composite comprising a silicon oxide SiO.sub.x and a silicate, wherein 0<x<2; and post-processing the silicon composite to obtain a silicon composite negative electrode material.

Provided is a negative electrode active material for a lithium secondary battery which includes: a silicon-silicon oxide-magnesium silicate composite comprising a silicon oxide (SiO.sub.x, 0<x≤2) matrix; and silicon (Si) crystal grains, MgSiO.sub.3 crystal grains and Mg.sub.2SiO.sub.4 crystal grains present in the silicon oxide matrix, wherein the MgSiO.sub.3 crystal grains have a crystal size of 5-30 nm and the Mg.sub.2SiO.sub.4 crystal grains have a crystal size of 20-100 nm in the silicon-silicon oxide-magnesium silicate composite, and the content ratio of MgSiO.sub.3 crystal grains to Mg.sub.2SiO.sub.4 crystal grains is 2:1-1:1 on the weight basis. A method for preparing the negative electrode active material for a lithium secondary battery is also provided.

A method of forming a polyanion active material that includes providing a carbon source, providing a mobile ion source, providing an active metal material, providing a network material, providing a flux material, and mixing the various materials. In one aspect, the mixing step may include grinding or pulverizing materials to a uniform fine mixture. In one aspect, a ball mill may be utilized to mix the components. Following the mixing of the materials, the mixture is heated to a predetermined temperature in a non-oxidizing atmosphere to form a reaction product. In one aspect, the mixture is heated to a temperature above a melting temperature of the flux material. In this manner, the flux material provides a medium in which the various reactants may react to form the desired reaction product. Following the heating of the mixture the reaction product is washed, forming a carbon coated polyanion active material. Also disclosed is a polyanion active material that includes the in situ reaction product of a carbon source, mobile ion source, active metal material, network material, and a flux material wherein the polyanion active material includes a carbon coating formed thereon.

A method of forming a polyanion active material that includes providing a carbon source, providing a mobile ion source, providing an active metal material, providing a network material, providing a flux material, and mixing the various materials. In one aspect, the mixing step may include grinding or pulverizing materials to a uniform fine mixture. In one aspect, a ball mill may be utilized to mix the components. Following the mixing of the materials, the mixture is heated to a predetermined temperature in a non-oxidizing atmosphere to form a reaction product. In one aspect, the mixture is heated to a temperature above a melting temperature of the flux material. In this manner, the flux material provides a medium in which the various reactants may react to form the desired reaction product. Following the heating of the mixture the reaction product is washed, forming a carbon coated polyanion active material. Also disclosed is a polyanion active material that includes the in situ reaction product of a carbon source, mobile ion source, active metal material, network material, and a flux material wherein the polyanion active material includes a carbon coating formed thereon.

The present invention relates to methods for producing mixtures comprising noble metal and phyllomineral, and compositions obtained from said methods.