Substance and battery including the same
View Patent ↗A substance includes an oxide including at least one element selected from the group including cobalt Co, nickel Ni, manganese Mn, iron Fe, and copper Cu; and silicon Si chemically bonded to the surface of the oxide. Also, a battery includes a cathode, an anode, and an electrolyte, wherein the cathode includes an oxide including at least one selected from the group including cobalt Co, nickel Ni, manganese Mn, iron Fe, and copper Cu; and a substance including silicon Si chemically bonded to the surface of the oxide.
1. A cathode active material comprising:
oxide particles, the oxide including an element selected from the group consisting of cobalt, nickel, manganese, iron, and copper; and
silicon chemically bonded to a surface of said oxide particles,
wherein a bonding state of silicon on the surface of said oxide particles is M1-O—Si—R or M 1 -O—Si—O, wherein M1 represents the element included in the oxide and R represents a carbon chain or a carbon chain having a functional group,
wherein an element ratio of said silicon on the surface of said oxide particles is 3% or more and 90% or less, and
wherein the average particle size of the oxide particles is 0.005 μm or more and 0.5 μm or less.
2. The cathode active material according to claim 1 , wherein said oxide is cobalt oxide.
3. The cathode active material according to claim 1 , wherein said element included in said oxide is reduced to have a valence of 1 or less by electrochemical oxidation reduction reaction with lithium.
4. The cathode active material according to claim 1 , wherein said silicon is bonded in a state of SiO 2 .
5. The cathode active material according to claim 1 , wherein carbon is uniformly distributed on the surface of said oxide particles.
6. The cathode active material according to claim 1 , wherein the oxide is selected from the group consisting of CoO, FeO, CuO, NiO, Fe 2 O 3 , CO 3 O 4 , Li 2 CoO, Ni x Mg 6-x MnO 8 , LiNiVO 4 , Co 2 SnO 4 , and Mn 3 O 4 .
7. The cathode active material according to claim 1 , wherein the bonding state of silicon on the surface of said oxide particles is associated with a discharge capacity retention ratio of 93% or more.
8. The cathode active material according to claim 1 , wherein the bonding state of silicon on the surface of said oxide particles is associated with an initial discharge capacity of 761 mAh/g or more.
9. A battery comprising a cathode, an anode, and an electrolyte, wherein said cathode includes a cathode active material comprising:
oxide particles, the oxide including an element selected from the group consisting of cobalt, nickel, manganese, iron, and copper; and
silicon chemically bonded to a surface of said oxide particles,
wherein a bonding state of silicon on the surface of said oxide particles is M1-O—Si—R or M1-O—Si—O, wherein M1 represents the element included in the oxide and R represents a carbon chain or a carbon chain having a functional group,
wherein an element ratio of said silicon on the surface of said oxide particles is 3% or more and 90% or less, and
wherein the average particle size of said oxide particles is 0.005 μm or more and 0.5 μm or less.
10. The battery according to claim 9 , wherein said oxide is cobalt oxide.
11. The battery according to claim 9 , wherein the element included in said oxide is reduced to have a valence of 1 or less by electrochemical oxidation reduction reaction with lithium.
12. The battery according to claim 9 , wherein said silicon is bonded in the state of SiO 2 .
13. The battery according to claim 9 , wherein carbon is uniformly distributed on the surface of said oxide particles.
14. The battery according to claim 9 , wherein the oxide is selected from the group consisting of CoO, FeO, CuO, NiO, Fe 2 O 3 , Co 3 O 4 , Li 2 CoO, Ni x Mg 6-x MnO 8 , LiNiVO 4 , Co 2 SnO 4 , and Mn 3 O 4 .
15. The battery according to claim 9 , wherein the bonding state of silicon on the surface of said oxide particles is associated with a discharge capacity retention ratio of 93% or more.
16. The battery according to claim 9 , wherein the bonding state of silicon on the surface of said oxide particles is associated with an initial discharge capacity of 761 mAh/g or more.