	US 11,996,561 B2
	Anode for lithium ion secondary battery, method for preparing the same and lithium ion secondary battery comprising the same
Sung Jun Park, Daejeon (KR); Byoung Wook Jo, Daejeon (KR); Byung Chan Kang, Daejeon (KR); and Yong Hee Kang, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Nov. 1, 2021, as Appl. No. 17/515,609.
Claims priority of application No. 10-2020-0144518 (KR), filed on Nov. 2, 2020.
Prior Publication US 2022/0140343 A1, May 5, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/583 (2010.01); H01M 4/04 (2006.01); H01M 4/133 (2010.01); H01M 4/134 (2010.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 10/0525 (2010.01); H01M 50/171 (2021.01); H01M 4/02 (2006.01)

CPC H01M 4/583 (2013.01) [H01M 4/0404 (2013.01); H01M 4/0435 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/366 (2013.01); H01M 4/386 (2013.01); H01M 10/0525 (2013.01); H01M 50/171 (2021.01); H01M 2004/021 (2013.01)]

9 Claims

1. An anode for a lithium ion secondary battery, the anode for a lithium ion secondary battery comprising an anode mixture layer on at least one surface of an anode current collector,

wherein the anode mixture layer comprises a binder,

wherein pores inside the anode mixture layer have a Z-tensor value of 0.33 or more,

wherein the Z-tensor value is measured by:

obtaining a three-dimensional structure inside the anode mixture layer using an X-ray microscope,

three-dimensional rendering of an image of the three-dimensional structure inside the anode mixture layer to convert into a three-dimensional image of an internal pore structure of the anode mixture layer, and

evaluating the three dimensional structure for each pore in three axes of X, Y, and Z, and

wherein the anode mixture layer has an electrode density of 1.50 g/cc or more on one side.