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US 12,614,725 B2Granted
Positive electrode for lithium secondary battery and positive electrode and lithium secondary battery comprising the same
AssigneeLG Energy Solution, Ltd.
InventorsJi-Hye Kim, Sang-Seung Oh, Hyun-Seok Lee, Sung-Hwan Cho
Life of this patent
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Abstract
A positive electrode for a lithium secondary battery comprising a multilayer structure of electrode active materials. The first positive electrode active material layer comprising a positive electrode active material particles and a conductive material on at least one surface of the current collector. The second positive electrode active material layer positioned on the first positive electrode active material layer and comprising positive electrode active material particles and a conductive material.
Claims15
A positive electrode for a lithium secondary battery, comprising:
- a current collector;
- a first positive electrode active material layer on a first surface of the current collector;
- and
- a second positive electrode active material layer on the first positive electrode active material layer,
- wherein the first positive electrode active material layer includes a first positive electrode active material particle and a conductive material, the first positive electrode active material particle including at least one of a primary macroparticle having an average particle size (D50) of 0.5 to 3 μm, a secondary particle having an average particle size (D50) of 3 to 7 μm formed by agglomeration of the primary macroparticle, or a mixture thereof,
- wherein the second positive electrode active material layer includes a second positive electrode active material particle and a conductive material, the second positive electrode active material particle including:
- a secondary microparticle having an average particle size (D50) of 1 to 7 μm formed by agglomeration of the primary macroparticle having an average particle size (D50) of 0.5 to 3 μm or by agglomeration of a primary microparticle having a smaller average particle size (D50) than the primary macroparticle, and
- a secondary macroparticle having an average particle size (D50) of 7 to 20 μm formed by agglomeration of the primary microparticle having the smaller average particle size (D50) than the primary macroparticle, wherein an average particle size (D50) of the secondary macroparticle is larger than the average particle size (D50) of the secondary microparticle,
- wherein the first and second positive electrode active material particles are a nickel-based lithium transition metal oxide positive electrode active material, and
- wherein the conductive material included in the second positive electrode active material layer includes a first single-walled carbon nanotube.
7 more elements
Dependencies are inferred from the claim text.