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US 10,483,544 B2Granted
Lithium secondary batteries
AssigneeSK Innovation Co., Ltd.
InventorsJee Hee Lee, Sang Jin Kim, Hyo Sang Kim, Jung Hwan Kim
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Abstract
Provided is a lithium secondary battery including an anode containing agglomerate artificial graphite having pores with an average diameter of 80 to 150 nm; and an electrolyte solution having a viscosity of 5.0 cP or less at 25° C. The lithium secondary battery according to the present invention may have excellent life characteristics, high temperature storage characteristics and output characteristics.
Claims7
A lithium secondary battery comprising:
- an anode containing agglomerate artificial graphite having pores with an average diameter of 80 to 150 nm;
- and an electrolyte solution having a viscosity of 5.0 cP or less at 25° C.,
- wherein the agglomerate artificial graphite satisfies the following Equation 1:
- 0.1≤ΔHA/HA≤0.4
- wherein HA is an average particle diameter (μm) of the agglomerate artificial graphite;
- and ΔHA is an average particle diameter variation (μm) of the agglomerate artificial graphite when applying a pressure of 4 mN/cm2,
- wherein the electrolyte solution contains a first solvent including ethylmethyl carbonate, diethyl carbonate or a mixed solution thereof and a second solvent including at least one selected from dimethyl carbonate (DMC), dipropyl carbonate (DPC), methylpropyl carbonate (MPC), ethylpropyl carbonate (EPC), ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC).
4 more elements
A lithium secondary battery comprising:
- an anode containing agglomerate artificial graphite having pores with an average diameter of 80 to 150 nm;
- and an electrolyte solution having a viscosity of 5.0 cP or less at 25° C.,
- wherein the agglomerate artificial graphite has a true density of 2 to 2.5 g/cm3, and a specific surface area of 0.5 to 5 m2/g,
- wherein the electrolyte solution contains a first solvent including ethylmethyl carbonate, diethyl carbonate or a mixed solution thereof, and a second solvent including at least one selected from dimethyl carbonate (DMC), dipropyl carbonate (DPC), methylpropyl carbonate (MPC), ethylpropyl carbonate (EPC), ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC).
1 more element
Dependencies are inferred from the claim text.