Lithium-ion secondary battery with a negative electrode containing vanadium
View Patent ↗The lithium-ion secondary battery includes a positive electrode containing an active material made of a compound including lithium and a transition metal; an electrolyte containing 5 to 30 ppm of hydrofluoric acid; and a negative electrode containing 1 to 100 ppm of vanadium.
1. A lithium-ion secondary battery comprising:
a positive electrode containing an active material made of a compound including lithium and a transition metal;
an electrolyte containing 5 to 30 ppm of hydrofluoric acid; and
a negative electrode containing 1 to 100 ppm of vanadium,
wherein when the negative electrode contains graphite as an active material, the negative electrode is obtained by mixing graphite with a vanadium source.
2. The lithium-ion secondary battery according to claim 1 ,
wherein the positive electrode contains an active material of Li a (M) b (PO 4 ) c F d (M=VO or V, 0.9≤a≤3.3, 0.9≤b≤2.2, 0.9≤c≤3.3, 0≤d≤2.0).
3. The lithium-ion secondary battery according to claim 1 ,
wherein the negative electrode contains graphite as an active material.
4. The lithium-ion secondary battery according to claim 1 ,
wherein the negative electrode contains a mixture of silicon and silicon oxide as an active material.
5. The lithium-ion secondary battery according to claim 1 ,
wherein the negative electrode contains a mixture of graphite, silicon and silicon oxide as an active material.
6. The lithium-ion secondary battery according to claim 1 ,
wherein the electrolyte contains 5 to 15 ppm of hydrofluoric acid.
7. The lithium-ion secondary battery according to claim 1 ,
wherein the electrolyte contains 20 to 30 ppm of hydrofluoric acid.
8. The lithium-ion secondary battery according to claim 1 ,
wherein the positive electrode contains LiVOPO 4 as an active material.
9. The lithium-ion secondary battery according to claim 1 ,
wherein V 2 O 5 is a source for the vanadium.