All-solid-state lithium ion secondary battery
Disclosed is an all-solid-state lithium ion secondary battery excellent in cycle characteristics. The battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises anode active material particles, an electroconductive material and a solid electrolyte; wherein the anode active material particles comprise at least one active material selected from the group consisting of elemental silicon and SiO; and wherein, for the anode active material particles, a value A obtained by the following formula (1) is 6.1 or more and 54.8 or less: A=S BET ×d med ×D Formula (1) where S BET is a BET specific surface area (m 2 /g) of the anode active material particles; d med is a median diameter D50 (μm) of the anode active material particles; and D is a density (g/cm 3 ) of the anode active material particles.
1. An all-solid-state lithium ion secondary battery,
wherein an anode comprises anode active material particles, an electroconductive material and a solid electrolyte;
wherein the anode active material particles comprise at least one active material selected from the group consisting of elemental silicon and SiO; and
wherein, for the anode active material particles, a value A obtained by the following formula (1) is 6.1 or more and 54.8 or less:
A=S BET ×d med ×D Formula (1)
where S BET is a BET specific surface area (m 2 /g) of the anode active material particles; d med is a median diameter D50 (μm) of the anode active material particles; and D is a density (g/cm 3 ) of the anode active material particles.
2. The all-solid-state lithium ion secondary battery according to claim 1 , wherein a value obtained by dividing, by the value A, a volume percentage (%) of the electroconductive material when a volume of the anode is determined as 100 volume %, is 0.05 or more and 0.50 or less.
3. An all-solid-state lithium ion secondary battery,
wherein an anode is formed by using an anode mixture comprising anode active material particles, an electroconductive material and a solid electrolyte;
wherein the anode active material particles comprise at least one active material selected from the group consisting of elemental silicon and SiO; and
wherein, for the anode active material particles, a value A obtained by the following formula (1) is 6.1 or more and 54.8 or less:
A=S BET ×d med ×D Formula (1)
where S BET is a BET specific surface area (m 2 /g) of the anode active material particles; d med is a median diameter D50 (μm) of the anode active material particles; and D is a density (g/cm 3 ) of the anode active material particles.
4. The all-solid-state lithium ion secondary battery according to claim 3 , wherein a value obtained by dividing, by the value A, a volume percentage (%) of the electroconductive material when a volume of the anode mixture is determined as 100 volume %, is 0.05 or more and 0.50 or less.
5. The all-solid-state lithium ion secondary battery according to claim 1 , wherein the solid electrolyte is a sulfide-based solid electrolyte.
6. The all-solid-state lithium ion secondary battery according to claim 3 , wherein the solid electrolyte is a sulfide-based solid electrolyte.
7. The all-solid-state lithium ion secondary battery according to claim 1 , wherein the electroconductive material is at least one carbonaceous material selected from the group consisting of carbon black, carbon nanotube and carbon nanofiber.
8. The all-solid-state lithium ion secondary battery according to claim 3 , wherein the electroconductive material is at least one carbonaceous material selected from the group consisting of carbon black, carbon nanotube and carbon nanofiber.