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US 2022/0045327 A1Published application
Anode active material and lithium secondary battery including the same
AssigneeSK Innovation Co., Ltd.
InventorsHae Suk HWANG, Hee Gyoung KANG, Hyo Sang Kim, So Hyun PARK, Jong Hyuk Lee
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Abstract
An anode active material according to an embodiment of the present invention includes a first graphite particle and a second graphite particle having a different particle diameter from that of the first graphite particle. A ratio of a pellet density relative to a. tap density of the anode active material is from 1.3 to 1.45. A particle deformation of the anode is suppressed to achieve a lithium secondary battery having improved long-term and high-energy properties.
Claims11
An anode active material, comprising:
- a first graphite particle;
- and
- a second graphite particle having a different particle diameter from at of the first graphite particle,
- wherein a pellet density and a tap density of the anode active material satisfy a relation of Equation 1:
- 1.3≤DP/DT≤1.45 [Equation 1]
- wherein, in Equation 1, DP is the pellet density (g/cm3) of the anode active material, and DT is the tap density (g/cm3) of the anode active material, wherein, the pellet density is calculated using a height difference measured after putting 1 g of the anode active material into a cylindrical pelletizer with a diameter of 13 mm and pressurizing the pelletizer with 3 metric ton for 10 seconds,
- wherein the tap density is measured from a volume and a weight of a sample obtained after filling the sample of log of the anode active material in 25 ml measuring cylinder, and then tapping with a stroke length of 10 mm 3,000 times.
4 more elements
Dependencies are inferred from the claim text.