US 12,406,991 B2
Lithium-sulfur battery
Bong-Soo Kim, Daejeon (KR); Da-Young Kang, Daejeon (KR); So-Young Kim, Daejeon (KR); and Jung-Hoon Han, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Filed by LG Energy Solution, Ltd., Seoul (KR)
Filed on Dec. 18, 2023, as Appl. No. 18/544,234.
Claims priority of application No. 10-2023-0066600 (KR), filed on May 23, 2023.
Prior Publication US 2024/0396041 A1, Nov. 28, 2024
Int. Cl. H01M 4/58 (2010.01); H01M 4/02 (2006.01); H01M 4/136 (2010.01); H01M 4/587 (2010.01); H01M 10/052 (2010.01); H01M 50/105 (2021.01)
CPC H01M 4/5815 (2013.01) [H01M 4/136 (2013.01); H01M 4/587 (2013.01); H01M 10/052 (2013.01); H01M 50/105 (2021.01); H01M 2004/028 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A lithium-sulfur battery comprising:
a positive electrode comprising a sulfur-carbon composite;
a negative electrode;
a separator disposed between the positive electrode and the negative electrode; and
an electrolyte,
wherein the lithium-sulfur battery has an energy density of 300 Wh/kg or more at 2.0 C discharge rate,
wherein the lithium-sulfur battery has a ratio R(1.0 C/0.5 C) according to the following Equation 1 of 80% or more,

OG Complex Work Unit Math
wherein A(DoD 100)1.0 C is an amount of lithium sulfide (Li2S) present at 100% depth of discharge state (DoD 100) of the lithium-sulfur battery discharged at 1.0 C,
A(DoD 100)0.5 C is an amount of lithium sulfide (Li2S) present at DoD 100 of the lithium-sulfur battery discharged at 0.5 C,
wherein the amount of the lithium sulfide (Li2S) is a weight, a volume, or a number of moles of the lithium sulfide (Li2S), and
the ratio R(1.0 C/0.5 C) is determined based on a ratio of peak intensities of the lithium sulfide (Li2S) in a scattering vector (q) region of from 1.85 to 1.92 Å−1 in an X-ray diffraction (XRD) spectrum of the lithium-sulfur battery.