Hyundai Motor Company

Kia Motors Corporation

Ulsan National Institute of Science and Technology

Kia Corporation

Unist, Inc.

Jung Young Cho

Yoon Sung Lee

Seung-Min Oh

Ik Kyu Kim

Sung Min Choi

Yeolmae Yeo

Woo Jin Shin

Ikkyu Kim

Hong Seok Min

Sang Mok Park

Seung Ho Ahn

Sangjin Park

Jung Je Woo

SungHoon Lim

Shinkook Kong

Jieun Lee

Dongjun Kim

Young Woo Lee

Sang Jin Park

Sa Heum Kim

Sung Ho Ban

Seyoung Lee

Yoon Ji Lee

Donghui Kim

KiSeok Koh

Shin Kook Kong

Nam-Soon Choi

Sang Joon Lee

Koeun Kim

Sungmin Choi

Byung Jo Jeong

Se Jung Oh

Hoi Suk Han

Juyeon Lee

Sung Ji Park

Sunghoon Lim

A method for checking defects in a lithium ion secondary battery includes primarily charging and degassing the lithium ion secondary battery after manufacture of the secondary battery, secondarily charging and discharging the secondary battery and then measuring one or more of OCVs and IRs of lithium ion secondary battery cells; pressurizing and aging the secondary battery by aging the secondary battery in a state in which a pressure of a designated magnitude or more is applied to the secondary battery, and checking whether or not the secondary battery cells are defective by re-measuring the one or more of OCVs and IRs of the secondary battery cells and then comparing the re-measured one or more of the OCVs and the IRs to the previously measured one or more of the OCVs and the IRs.

Method for checking defects in lithium ion secondary battery and lithium ion secondary battery manufactured thereby

Disclosed is a lithium secondary battery having an improved lifetime. The lithium secondary battery may include: a cathode including a cathode active material; an anode including an anode active material; a separator disposed between the cathode and the anode; and an electrolyte including bis(trimethylsilyl) 2,2-thiodiacetate.

Lithium secondary battery

Disclosed are an electrolyte for a lithium secondary battery and a lithium secondary battery including the same. The electrolyte for the lithium secondary battery includes a lithium salt, a solvent component and an additive including one or more of the following compounds, wherein each of R, Rand Ris independently hydrogen, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms, or an arylalkyl group having 6 to 30 carbon atoms.

Electrolyte for lithium secondary battery, lithium secondary battery containing the same

Provided are a silicon-based composite anode active material for a secondary battery and an anode including the same. The anode active material for a secondary battery may be a silicon-based composite anode active material, which may include a graphite and a silicon component including two or more selected from the group consisting of Si, Si-M, SiO, and SiC. The Si-M may be a silicon alloy, and the M may include at least one selected from the group consisting of a transition metal, an alkaline earth metal, a group 13 element, a group 14 element, and a rare earth element.

Silicon-based composite anode active material for secondary battery, anode comprising same

Disclose are an electrolyte composite for a lithium secondary battery having an improved output; a cathode including a protective film on its surface; and a lithium secondary battery comprising the same.

Electrolyte for lithium secondary battery and lithium secondary battery including the same

Disclosed is a lithium secondary battery capable of preventing the battery life from being reduced. The lithium secondary battery includes a cathode, an anode including silicon, a separator positioned between the cathode and the anode, and an electrolyte including flouoroethylene carbonate (FEC), wherein a weight ratio of the silicon to the FEC is about 0.4 to about 0.8.

Provided are a method of manufacturing an all-solid battery and an all-solid battery manufactured by the method. The all-solid batter may have edge portions that can be more effectively insulated. In particular, the all-solid battery may include a cathode layer, an anode layer, and an electrolyte layer, a first insulator disposed at an edge of the cathode layer and a second insulator disposed between the cathode layer and the first insulator, thereby forming a membrane of the second insulator for preventing contact between the cathode layer and the anode layer in pressing.

All-solid battery and method for manufacturing the same

A battery cell includes: an electrode assembly; a pouch case accommodating the electrode assembly therein; and an electrode lead including an outer lead protruding to an outside of the pouch case and an inner lead disposed between the outer lead and the electrode assembly, accommodated in the pouch case, bent plural times in a direction in which it connects the electrode assembly and the outer lead to each other, and cut by expansion force of the pouch case.

Battery cell

A battery cell includes: an electrode assembly; a pouch case accommodating the electrode assembly therein; and an electrode lead including an outer lead protruding to an outside of the pouch case and an inner lead disposed between the outer lead and the electrode assembly, accommodated in the pouch case, and cut by expansion force of the pouch case.

A pouch cell includes a battery unit and a structure mounted on the battery unit. The structure is configured to limit an expansion of the battery unit and accommodate an electrolyte.

Pouch cell

Growing community of inventors

Seoul, South Korea

Jung Young Cho