	US 12,244,012 B2
	Lithium secondary battery
Min Wook Lee, Daejeon (KR); Joo Hwan Sung, Daejeon (KR); Hee Chang Youn, Daejeon (KR); Ju Young Yun, Daejeon (KR); Seok Jin Oh, Daejeon (KR); and Ji Min Park, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Filed by LG Energy Solution, Ltd., Seoul (KR)
Filed on Jun. 7, 2024, as Appl. No. 18/737,102.
Claims priority of application No. 10-2023-0074461 (KR), filed on Jun. 9, 2023.
Prior Publication US 2024/0413325 A1, Dec. 12, 2024
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/583 (2010.01); H01M 10/052 (2010.01); H01M 10/0568 (2010.01); H01M 50/204 (2021.01)

CPC H01M 4/525 (2013.01) [H01M 4/0404 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 4/583 (2013.01); H01M 10/052 (2013.01); H01M 10/0568 (2013.01); H01M 50/204 (2021.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)]

20 Claims

1. A lithium secondary battery comprising:

a positive electrode including a positive electrode active material;

a negative electrode including a negative electrode active material; and

an electrolyte,

wherein:

the lithium secondary battery has a nominal voltage of 3.68 V or greater; and

the lithium secondary battery is configured so that V_Prepresented by Equation (1) below is 4 mbar·Ah⁻¹·sec⁻¹or less:

V_P=ΔP/(t_max×C) Equation (1)

wherein,

ΔP is the difference between a maximum pressure P_maxin a chamber, which is measured by charging the lithium secondary battery to 4.35 V, placing the lithium secondary battery in the chamber of an inert atmosphere, and heating, thereby exploding the lithium secondary battery, and an initial pressure P₀in the chamber,

t_maxis time taken to reach P_max, and

C is a discharge capacity measured by CC-CV charging and CC discharging the lithium secondary battery in a voltage range of 2.5 V to 4.35 V at 0.33 C at 25° C.