US 11,658,287 B2
Rechargeable lithium battery
Jaehwan Ha, Yongin-si (KR); Kijun Kim, Yongin-si (KR); Junghyun Nam, Yongin-si (KR); Hoyong An, Yongin-si (KR); Heeeun Yoo, Yongin-si (KR); Yeonhee Yoon, Yongin-si (KR); Kyuseo Lee, Yongin-si (KR); Dongmyung Lee, Yongin-si (KR); and Seung-Hun Han, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Apr. 30, 2020, as Appl. No. 16/862,866.
Claims priority of application No. 10-2019-0052571 (KR), filed on May 3, 2019.
Prior Publication US 2020/0350566 A1, Nov. 5, 2020
Int. Cl. H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/58 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01); H01M 50/417 (2021.01)
CPC H01M 4/364 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/5825 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01); H01M 50/417 (2021.01); H01M 2004/021 (2013.01)] 20 Claims
 
1. A rechargeable lithium battery, comprising:
a negative electrode comprising:
a negative current collector;
a negative active material layer disposed on the negative current collector; and
a negative electrode functional layer disposed on the negative active material layer; and
a positive electrode comprising:
a positive current collector; and
a positive active material layer disposed on the positive current collector,
wherein the negative electrode functional layer comprises:
flake-shaped polyethylene particles,
wherein the positive active material layer comprises:
a first positive active material comprising at least one of a composite oxide of a metal selected from cobalt, manganese, nickel, and a combination thereof and lithium;
a second positive active material including a compound represented by Chemical Formula 1,
LiaFe1−x1Mx1 PO4
wherein, in Chemical Formula 1, 0.90≤a≤1.8, 0≤x1≤0.7, and M is Mn, Co, Ni, or a combination thereof; and
carbon nanotubes, which have an average length of 30 μm to about 100 μm,
wherein an aspect ratio of average length over average diameter of the carbon nanotubes is 1,000 to 5,400.
 
19. A rechargeable lithium battery, comprising:
a negative electrode comprising:
a negative current collector;
a negative active material layer disposed on the negative current collector; and
a negative electrode functional layer disposed on the negative active material layer; and
a positive electrode comprising:
a positive current collector; and
a positive active material layer disposed on the positive current collector,
wherein the negative electrode functional layer comprises:
flake-shaped polyethylene particles,
wherein the positive active material layer comprises:
a first positive active material comprising at least one of a composite oxide of a metal selected from cobalt, manganese, nickel, and a combination thereof and lithium;
a second positive active material including a compound represented by Chemical Formula 1,
LiaFe1−x1Mx1PO4  Chemical Formula 1
wherein, in Chemical Formula 1, 0.90≤a≤1.8, 0x1≤0.7, and M is Mn, Co, Ni, or a combination thereof; and
carbon nanotubes, which have an average length of 30 μm to about 100 μm,
wherein the positive active material layer further comprises a positive electrode conductive material, and
wherein the positive electrode conductive material is included in an amount of about 0.1 wt % to about 0.6 wt % based on a total weight of the positive active material layer.