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US 12,586,780 B2Granted
Cathode active material for lithium secondary battery, cathode including the same and lithium secondary battery including the same
AssigneeSK On Co., Ltd.
InventorsSang Wook Lee, Young Hoon Do, Young Uk Park, Yong Hyun Cho, Seung Ok Lee, Ji Sun Lee
Life of this patent
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Abstract
A cathode active material for a lithium secondary battery according to an embodiment of the present invention includes a lithium metal oxide particle containing nickel, and a coating material formed on at least a portion of a surface of the lithium metal oxide particle. The coating material includes a metalloid element or a metal element. A surface coating level of the cathode active material is 0.3 or more.
Claims9
A cathode active material for a lithium secondary battery, comprising:
- a lithium metal oxide particle containing nickel;
- and
- a coating material formed on at least a portion of a surface of the lithium metal oxide particle, the coating material comprising a metalloid element or a metal element, and
- wherein a surface coating level expressed as SCL1 in Equation 1 is 0.6 to 3.0, and a surface residual ratio of the coating material is from 40% to 90%,
- wherein the coating material comprises at least one selected from the group consisting of Al, Ti, Ba, Zr, Si, B, Mg, P, Sr, W and La:
- SCL
-
- 1
- =
- residual
-
- ratio
-
- of
-
- coating
-
- material
- ×
- surface
-
- coverage
- ×
- BET
- 1,000
- [
- Equation
-
- 1
- ]
- wherein, in Equation 1, the surface residual ratio of the coating material is a percentage equal to a weight of the coating material when the cathode active material is dissolved in a 2 wt % hydrochloric acid solution for a time corresponding to 8% of a time for completely dissolving the cathode active material relative to a weight of the coating material when the cathode active material is completely dissolved in the 2 wt % hydrochloric acid solution,
- the coverage is a percentage equal to an area in which a content of the coating material is 0.8 wt % or more based on 100 wt % of total detected elements relative to an area from which Ni is detected based on an energy-dispersive X-ray spectroscopy (EDS) mapping image of a surface of the cathode active material measured by an EDS, and
- the BET is a specific surface area of the cathode active material measured by a gas adsorption/desorption method.
30 more elements
A cathode for a lithium secondary battery, comprising:
- a cathode current collector;
- and
- a cathode active material layer formed on the cathode electrode current collector, wherein the cathode active material layer comprises:
- a lithium metal oxide particle containing nickel;
- and
- a coating material formed on at least a portion of a surface of the lithium metal oxide particle, the coating material comprising a metalloid element or a metal element,
- wherein a surface coating level of the cathode active material layer expressed as SCL2 in Equation 2 is 1.0 to 4.0, and a surface residual ratio of the coating material is from 50% to 80%,
- wherein the coating material comprises at least one selected from the group consisting of Al, Ti, Ba, Zr, Si, B, Mg, P, Sr, W and La:
- S
-
- C
-
- L
-
- 2
- =
- surface
-
- residual
-
- ratio
-
- of
-
- coating
-
- material
- ×
- coveragae
- ×
- B
-
- E
-
- T
- 1
-
- ,
- 000
- [
- Equation
-
- 2
- ]
- wherein, in Equation 2, the surface residual ratio of the coating material is a percentage equal to a weight of the coating material when the cathode active material layer is dissolved in a 2 wt % hydrochloric acid solution for a time corresponding to 8% of a time for completely dissolving the cathode active material layer relative to a weight of the coating material when the cathode active material layer is completely dissolved in the 2 wt % hydrochloric acid solution,
- the coverage is a percentage equal to an area in which a content of the coating material is 0.8 wt % or more based on 100 wt % of total detected elements relative to an area from which Ni is detected based on an energy-dispersive X-ray spectroscopy (EDS) mapping image of a surface of the cathode active material layer measured by an EDS, and
- the BET is a specific surface area of the cathode active material layer measured by a gas adsorption/desorption method.
44 more elements
Dependencies are inferred from the claim text.