Method for manufacturing positive electrode active material for power storage device

A method for manufacturing an active material, comprising the steps of:

• performing a mixing treatment of a compound containing lithium, a compound containing a transition metal, and a compound containing silicon;
• performing first heat treatment on the mixture to form first particles after the mixing treatment;
• performing grinding treatment on the first particles to obtain second particles after the first heat treatment;
• and
• performing second heat treatment on the second particles at a temperature lower than a temperature of the first heat treatment to form third particles after the grinding treatment,
• wherein the grinding treatment is performed by a planetary ball mill after adding a solvent to the first particles,
• wherein the grinding treatment is performed for longer time than the mixing treatment, and
• wherein the active material comprises lithium metal silicate.

A method for manufacturing an active material, comprising the steps of:

• performing a first mixing treatment of a mixture material comprising a compound containing lithium, a compound containing a transition metal, and a compound containing silicon to obtain a first mixture;
• performing first heat treatment on the first mixture to form first particles after the first mixing treatment;
• performing grinding treatment on the first particles to obtain second particles after the first heat treatment;
• adding a carbon-based material to the second particles and performing a second mixing treatment to obtain a second mixture;
• and
• performing second heat treatment on the second mixture at a temperature lower than a temperature of the first heat treatment to form third particles after the second mixing treatment,
• wherein the grinding treatment is performed by a planetary ball mill after adding a solvent to the first particles,
• wherein the grinding treatment is performed for longer time than the first mixing treatment, and
• wherein the active material comprises a lithium metal silicate.