US 12,394,783 B2
Anode for secondary battery and lithium secondary battery including the same
Yong Seok Lee, Daejeon (KR); Jae Yun Min, Daejeon (KR); Jae Ram Kim, Daejeon (KR); Jung Hwan Kim, Daejeon (KR); Sang Won Bae, Daejeon (KR); Ji Hee Bae, Daejeon (KR); Myung Ro Lee, Daejeon (KR); and Jae Yeong Lee, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Jan. 6, 2022, as Appl. No. 17/569,905.
Claims priority of application No. 10-2021-0038955 (KR), filed on Mar. 25, 2021.
Prior Publication US 2022/0310991 A1, Sep. 29, 2022
Int. Cl. H01M 4/36 (2006.01); H01M 4/133 (2010.01); H01M 4/48 (2010.01); H01M 4/485 (2010.01); H01M 4/587 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [H01M 4/133 (2013.01); H01M 4/483 (2013.01); H01M 4/485 (2013.01); H01M 4/587 (2013.01); H01M 4/625 (2013.01); H01M 10/0525 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An anode for a secondary battery, comprising:
an anode current collector, wherein the anode current collector is a single metal layer including gold, stainless steel, nickel, aluminum, titanium, copper, or an alloy thereof; and
an anode active material layer comprising a first anode active material layer and a second anode active material layer sequentially stacked from a surface of the anode current collector so that the first anode active material layer is disposed directly on the anode current collector and the second anode active material layer is disposed directly on a top surface of the first anode active material layer,
wherein the first anode active material layer is a single layer,
wherein the second anode active material layer is a single layer,
wherein each of the first anode active material layer and the second anode active material layer comprising a carbon-based active material and a silicon-based active material as an anode active material, and a carbon nanotube as a conductive material that is physically mixed with the anode active material,
wherein a content of the silicon-based active material in the second anode active material layer is from 6 wt % to 10 wt % and a content of the silicon-based active material in the first anode active material layer is from 1 wt % to 5 wt %,
a Raman R value of the carbon nanotube comprised in the second anode active material layer is smaller than a Raman R value of the carbon nanotube comprised in the first anode active material layer, and
the Raman R value is defined as a ratio (ID/IG) of an intensity (ID) of a D band and an intensity of a G band (IG) in a Raman spectrum obtained by a Raman spectroscopy.