US 11,909,037 B2
Positive electrode and lithium battery including the same
Hongsoo Choi, Seoul (KR); Hyeokjo Gwon, Hwaseong-si (KR); Soyeon Kim, Suwon-si (KR); Hyunseok Kim, Suwon-si (KR); and Wonseok Chang, Seoul (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-Do (KR); and SAMSUNG SDI CO., LTD., Gyeonggi-Do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR); and Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Dec. 1, 2022, as Appl. No. 18/060,681.
Application 18/060,681 is a continuation of application No. 16/675,359, filed on Nov. 6, 2019, granted, now 11,575,128.
Claims priority of application No. 10-2018-0167890 (KR), filed on Dec. 21, 2018.
Prior Publication US 2023/0104445 A1, Apr. 6, 2023
Int. Cl. H01M 4/48 (2010.01); H01M 4/525 (2010.01); H01M 4/505 (2010.01); H01M 10/05 (2010.01); H01M 10/0525 (2010.01); H01M 4/38 (2006.01); H01M 10/0565 (2010.01); C08F 12/26 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/382 (2013.01) [C08F 12/26 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 10/0565 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A positive electrode for a lithium battery comprising:
a composite material comprising
a positive active material as a core of the composite material, and
a coating layer located on a surface of the positive active material forming a shell on the core of the composite material,
wherein the coating layer comprises a copolymer comprising a first repeating unit represented by Formula 1, and a second repeating unit represented by Formula 2:

OG Complex Work Unit Chemistry
wherein in Formula 1,
Ar1 is a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C6-C30 heteroarylene group,
R1, R2, and R3 are each independently hydrogen, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C6-C30 aryl group, or a substituted or unsubstituted C3-C30 heteroaryl group,
A is a bond, a substituted or unsubstituted C1-C30 alkylene group, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C3-C30 heteroarylene group, a substituted or unsubstituted C4-C30 cycloalkylene group, or a substituted or unsubstituted C3-C30 heterocycloalkylene group,

OG Complex Work Unit Chemistry
is a 3-membered to 31-membered ring system comprising 2 to 30 carbon atoms, and X is —S, —N(R), or —P(R′),
R and R′ are each independently hydrogen, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C1-C30 heteroalkyl group, a substituted or unsubstituted C1-C30 alkoxy group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C7-C30 arylalkyl group, a substituted or unsubstituted C6-C30 aryloxy group, a substituted or unsubstituted C3-C30 heteroaryl group, a substituted or unsubstituted C4-C30 heteroarylalkyl group, a substituted or unsubstituted C3-C30 cycloalkyl group, a substituted or unsubstituted C2-C30 alkenyl group, or a substituted or unsubstituted C3-C30 alkynyl group, and
Y− is an anion,

OG Complex Work Unit Chemistry
wherein in Formula 2,
A1 is —C(═O)O—(CH2CH2O)a—R7, wherein R7 is hydrogen, a substituted or unsubstituted C1-C30 alkyl group, or a substituted or unsubstituted C6-C30 aryl group, and a is an integer of 1 to 10, and
R4, R5, and R6 are each independently hydrogen, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C6-C30 aryl group, or a substituted or unsubstituted C3-C30 heteroaryl group, and
in Formulae 1 and 2, m and n are mole fractions of the first repeating unit represented by Formula 1 and the second repeating unit represented by Formula 2, respectively, wherein a sum of m and n is 1, and m and n are each independently greater than 0 and less than 1.