US 11,843,117 B2
Anode for secondary battery, having optimized binder distribution, and secondary battery comprising same
Byoung-Wook Jo, Daejeon (KR); Hyun-Joong Jang, Daejeon (KR); and Min-Hwan Kim, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK INNOVATION CO., LTD., Seoul (KR)
Filed on Jan. 6, 2022, as Appl. No. 17/570,204.
Application 17/570,204 is a continuation of application No. 17/267,989, previously published as PCT/KR2019/011104, filed on Aug. 30, 2019.
Claims priority of application No. 10-2018-0103144 (KR), filed on Aug. 31, 2018; and application No. 10-2019-0100358 (KR), filed on Aug. 16, 2019.
Prior Publication US 2022/0131152 A1, Apr. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/62 (2006.01); C08L 9/06 (2006.01); H01M 4/48 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/622 (2013.01) [C08L 9/06 (2013.01); H01M 4/483 (2013.01); H01M 4/587 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An anode for a non-aqueous electrolyte secondary battery, the anode comprising:
an anode current collector; and
an anode mixture layer formed on the anode current collector, the anode mixture layer comprising an anode active material, a conductive material, a rubber-based binder and a water-soluble polymer-based binder,
wherein when the anode mixture layer is divided into 10 equal intervals in a thickness direction starting from the surface of the anode current collector, the 10 intervals defined by 11 interval parts 0 to 10 with interval part 0 denoting the surface of the current collector, interval part 1 denoting the end of the first interval, interval part 2 denoting the end of the second interval, interval part 3 denoting the end of the third interval and so on and so forth till interval part 10 denoting the end of the tenth interval,
CA,7-10 is a content ratio of the total amount of rubber-based binder in the intervals 8, 9, and 10 formed between interval parts 7 and 10 to a total amount of the rubber-based binder in all of intervals 1 to 10 formed between interval parts 0 to 10,
CB,7-10 is a content ratio of the total amount of water-soluble polymer-based binder in the intervals 8, 9, and 10 formed between interval parts 7 and 10 to a total amount of the water-soluble polymer-based binder in all of intervals 1 to 10 formed between interval parts 0 to 10,
the CA,7-10/CB,7-10 is 0.50 to 0.98, and the CA, 7-10 is 18 to 30%.