NOVELTY - A water-oil-water type, solid-oil-water type or oil-water type emulsion is manufactured by water-oil type emulsion formation process which adds polar liquid which contains polysilane derivative in organic solvent containing polymerizable monomer, and solid-oil type suspension formation process which disperses polysilane derivative to organic solvent containing polymerizable monomer, dissolves polysilane derivative in organic solvent containing polymerizable monomer and allows to pass through membrane or hole of partition which has hole for the liquid.    USE - Manufacture of water-oil-water type, solid-oil-water type or oil-water type emulsion for microcapsule used for active material particle (all claimed) for lithium ion secondary battery of domestic electrical appliances e.g. personal computer and mobile communication apparatus, office apparatus and industrial apparatus.    ADVANTAGE - Low dispersion of particle size of active material particle is suppressed. Dispersion in battery capacity for every electrode can be suppressed.    DETAILED DESCRIPTION - A water-oil-water type, solid-oil-water type or oil-water type emulsion is manufactured by water-oil type emulsion formation process which adds polar liquid which contains polysilane derivative in organic solvent containing polymerizable monomer, solid-oil type suspension formation process which disperses polysilane derivative to organic solvent containing polymerizable monomer, dissolves polysilane derivative in organic solvent containing polymerizable monomer and allows to pass through membrane or hole of partition which has hole for the liquid and 1st emulsion formation process which disperses liquid which passed through 1st hole passing stage to polar continuous compatible liquid. INDEPENDENT CLAIMS are included for:    (1) manufacture of microcapsule which involves polymerizing polymerizable monomer in water-oil-water type, solid-oil-water type or oil-water type emulsion;    (2) manufacture of active material particle which involves baking the microcapsule;    (3) water-oil-water type or solid-oil-water type emulsion comprising solid phase containing inner water phase containing polysilane derivative or polysilane derivative, oil phase containing polymerizable monomer, and outer water phase;    (4) oil-water type emulsion comprising oil phase containing polysilane derivative and polymerizable monomer and outer water phase;    (5) microcapsule comprising oil phase containing polysilane derivative and polymer; and    (6) spherical active material particle comprising silicon single-piece and carbon.