Lithium-ion battery
A lithium-ion battery with high safety is provided. A lithium-ion battery 20 includes an electrode group 6 , an electrolyte, and a battery container 5 that contains the electrode group 6 and the electrolyte. The electrode group 6 is formed by stacking a positive electrode and a negative electrode via a separator. The positive electrode contains a composite oxide of lithium, nickel, manganese, and cobalt as a main positive active material. The negative electrode contains amorphous carbon as a main negative active material. The lithium-ion battery 20 has a discharge capacity of 20 Ah or more. The ratio (the value of Y/X) of a volume Y occupied by the electrolyte to a volume X of a void space in the battery container 5 is 0.65 or more.
1. A lithium-ion battery comprising an electrode group, an electrolyte, and a battery container that contains the electrode group and the electrolyte, the electrode group being formed by stacking a positive electrode and a negative electrode via a separator, the positive electrode containing a composite oxide of lithium, nickel, manganese, and cobalt as a main positive active material, the negative electrode containing amorphous carbon as a main negative active material, and the lithium-ion battery having a discharge capacity of 20 Ah or more, wherein
a ratio (a value of Y/X) of a volume Y occupied by the electrolyte to a volume X of a void space in the battery container, with the electrode group being placed in the battery container, is 0.65 or more and 0.94 or less.
2. The lithium-ion battery according to claim 1 , wherein
the composite oxide of lithium, nickel, manganese, and cobalt is a layered composite oxide of lithium, nickel, manganese, and cobalt.
3. The lithium-ion battery according to claim 1 , wherein
the amorphous carbon is easily graphitizable carbon.
4. The lithium-ion battery according to claim 1 , wherein
the electrolyte is prepared by dissolving lithium hexafluorophosphate in a mixed solution prepared by mixing ethylene carbonate, dimethyl carbonate, and ethylmethyl carbonate.
5. The lithium-ion battery according to claim 1 , wherein
the discharge capacity is 20 Ah or more and less than 99 Ah.
6. The lithium-ion battery according to claim 1 , wherein
the electrode group is a wound electrode group.
7. The lithium-ion battery according to claim 2 , wherein
the amorphous carbon is easily graphitizable carbon.
8. The lithium-ion battery according to claim 2 , wherein
the electrolyte is prepared by dissolving lithium hexafluorophosphate in a mixed solution prepared by mixing ethylene carbonate, dimethyl carbonate, and ethylmethyl carbonate.
9. The lithium-ion battery according to claim 3 , wherein
the electrolyte is prepared by dissolving lithium hexafluorophosphate in a mixed solution prepared by mixing ethylene carbonate, dimethyl carbonate, and ethylmethyl carbonate.
10. The lithium-ion battery according to claim 2 , wherein
the discharge capacity is 20 Ah or more and less than 99 Ah.
11. The lithium-ion battery according to claim 3 , wherein
the discharge capacity is 20 Ah or more and less than 99 Ah.
12. The lithium-ion battery according to claim 4 , wherein
the discharge capacity is 20 Ah or more and less than 99 Ah.
13. The lithium-ion battery according to claim 2 , wherein
the electrode group is a wound electrode group.
14. The lithium-ion battery according to claim 3 , wherein
the electrode group is a wound electrode group.
15. The lithium-ion battery according to claim 4 , wherein
the electrode group is a wound electrode group.
16. The lithium-ion battery according to claim 5 , wherein
the electrode group is a wound electrode group.