元の名称記録: SK On Co., Ltd.

Embodiments of the present disclosure provide a cathode active material for a lithium secondary battery. The cathode active material for a lithium secondary battery includes lithium-transition metal oxide particles having a nickel oxidation number ratio of 0.24 to 0.98, as defined by Equation 1. By adjusting the nickel oxidation number ratio of the lithium-transition metal oxide particles, a lithium secondary battery with improved cycle life characteristics and capacity characteristics may be provided.

A lithium secondary battery according to the present disclosure includes: a cathode which includes a cathode active material layer including a lithium transition metal oxide; an anode disposed opposite to the cathode and including an anode active material layer, and an electrolyte which includes a lithium salt, a solvent including a carbonate solvent and an ether solvent, and lithium nitrate (LiNO). In the electrolyte, a lithium nitrate dissolution ratio, defined by Equation 1, in the electrolyte is 0.01 to 0.07.

The present disclosure provides battery cell including: an electrode assembly; a cell case in which an accommodation space for accommodating the electrode assembly is formed and one side thereof is open and; a cap plate covering an open portion of the cell case and coupled to the cell case; and a magnetic member providing magnetic force to the cap plate so that the cap plate may maintain an aligned position with respect to the cell case, wherein the magnetic member is disposed on at least one of the electrode assembly, the cell case or the cap plate.

A battery device according to the present disclosure may include: a cell assembly having a plurality of battery cells arranged in a first direction; a case having an accommodation space in which the cell assembly is accommodated; and a surface pressure member disposed between the cell assembly accommodated in the accommodation space and the case, wherein the surface pressure member may include: an outer cover having a sealed inner space and formed of a flexible material; a support member disposed in the inner space of the outer cover; and a reinforcing frame coupled to both ends of the outer cover.

Provided are a battery cell and a battery module. The battery cell includes a cell assembly including at least one electrode assembly and a current collecting assembly disposed on at least one side of the cell assembly and including a first current collecting portion electrically connected to an electrode tab of the electrode assembly, wherein the first current collecting portion is formed stepwise and contacts the electrode tab on a first surface facing the cell assembly.

A battery cell includes an electrode assembly including a positive electrode, a negative electrode, and a separator; a case having an internal space in which the electrode assembly is accommodated; and a current collector electrically connected to an electrode tab of the electrode assembly, wherein the current collector includes a through-hole through which the electrode tab of the electrode assembly passes.