Electrode material for lithium secondary battery and lithium secondary battery

A lithium secondary battery which repeatingly absorbs and discharges lithium ions by immersing or penetrating an organic electrolyte into a group of electrodes, said electrodes are wound or layered one upon another between a positive-electrode material in contact with a positive-electrode plate and a negative-electrode material in contact with a negative-electrode plate through an intermediary of a separator,

• wherein said positive-electrode material contains a component (d) and a component (e), each of said components (d) and (e) has at least one phase selected from among a graphene phase and an amorphous phase as a surface phase, and said positive-electrode material contains a composite positive-electrode active substance obtained by calcining in a reducing atmosphere to form a fused surface phase;
• said component (d) is Olivine-type lithium metal phosphate coated with a carbon material and has at least one phase selected from among said graphene phase and said amorphous phase, having a thickness of 1-10 nm, on at least a surface thereof;
• said component (e) is a carbon material other than a graphite-based carbon material and has at least one phase selected from among said graphene phase and said amorphous phase on at least a surface thereof,
• said fused surface phase having a thickness of 1-10 nm of said components (d) and (e) comprises a carbon material obtained by treating said surface phase with a gas or a liquid containing carbon hydride to form coated component (d) and thereafter calcining said coated component (d) in a reducing atmosphere.

A lithium secondary battery which repeatingly absorbs and discharges lithium ions by immersing or penetrating an organic electrolyte into a group of electrodes, said electrodes are wound or layered one upon another between a positive-electrode material in contact with a positive-electrode plate and a negative-electrode material in contact with a negative-electrode plate through an intermediary of a separator,

• wherein said negative-electrode material is an electrode material which contains a component (a), a component (b), and a component (c), each of said components (a), (b), and (c) has at least one phase selected from among a graphene phase and an amorphous phase as a surface phase, and said negative-electrode material contains a composite negative-electrode active substance obtained by calcining in a reducing atmosphere to form a fused surface phase;
• said component (a) is at least one active substance, having an average particle diameter of 100 to 500 nm, selected from among a metal oxide containing metal and an alloy material each of which has at least one phase selected from among said graphene phase and said amorphous phase, on at least a surface thereof, and said active substance is a powder of tin oxide containing metallic tin or a powder of silicon oxide containing metallic silicon;
• said component (b) is a graphite-based carbon material having at least one phase selected from among said graphene phase and said amorphous phase on at least a surface thereof and the mixing ratio of said component (b) to the entire material composing the negative-electrode material is set to 60 to 90 mass %;
• said component (c) is a carbon material other than said graphite-based carbon material and has at least one phase selected from among said graphene phase and said amorphous phase on at least a surface thereof and the mixing ratio of said component (c) to the entire material composing the negative-electrode material is set to 1 to 12 mass %;
• wherein said positive-electrode material contains a component (d) and a component (e), each of said components (d) and (e) has at least one phase selected from among a graphene phase and an amorphous phase as a surface phase, and said positive-electrode material contains a composite positive-electrode active substance obtained by calcining in a reducing atmosphere to form a fused surface phase;
• said component (d) is Olivine-type lithium metal phosphate has at least one phase selected from among said graphene phase and said amorphous phase, on at least a surface thereof;
• said component (e) is a carbon material other than a graphite-based carbon material and has at least one phase selected from among said graphene phase and said amorphous phase on at least a surface thereof,
• said fused surface phase having a thickness of 1-10 nm of said components (d) and (e) comprises a carbon material obtained by treating said surface phase with a gas or a liquid containing carbon hydride and thereafter forming said fused surface phase by calcining said components (d) and (e) in a reducing atmosphere.