Kokam Co., Ltd.

Daejung Em Co., Ltd.

Kokam Engineering Co., Ltd.

Eagelpicher Kokam Co., Ltd.

Ji-Jun Hong

Yoon-Jeong Heo

Sung-Tae Ko

Woo-Seong Kim

Seong-Bae Kim

In-Beom Hwang

Sung-Wook Moon

Yoo-Jung Kwon

Pan-Kyu Park

Ki-Hong Park

Choong-Yeon Chong

Kwang-Hyun Kim

Sung-Tae Koh

Ki-Sup Song

Duk-Hyung Yum

Disclosed is an electrode active material including a core formed from one selected from the group consisting of lithium-containing transition metal oxide, a carbon material, a lithium metal, and a metal compound, or mixtures thereof, and a shell formed on a surface of the core and including lithium metal oxide particles and polymer, and a lithium secondary battery using the same.

Lithium secondary battery having improved safety and stability

Provided are an anode active material for a lithium secondary battery, a method of preparing the same and a lithium secondary battery comprising the same. The anode active material for a lithium secondary battery includes a carbonaceous material core; and a shell formed outside of the carbonaceous material core. The shell includes a plurality of spinel-type lithium titanium oxide particles, and a plurality of metal oxide particles, wherein the metal belongs to group 4 or 13 of the periodic table, the metal oxide particles filling voids formed by the carbonaceous material and the plurality of spinel-type lithium titanium oxide particles. The anode active material for a lithium secondary battery has the metal oxide shell, and thus has the improved conductivity, a high output density, and consequently excellent electrical characteristics. The lithium secondary battery manufactured using the anode active material ensures safety sufficiently.

Anode active material for lithium secondary battery, method for preparing the same and lithium secondary battery comprising the same

Disclosed is a high heat resistance composite separator including a porous substrate having a plurality of pores, an inorganic coating layer formed on one surface of the porous substrate, the inorganic coating layer including a plurality of inorganic particles and a binder polymer disposed on a portion or all of surfaces of the inorganic particles to connect and bind the inorganic particles, and a high heat resistance polymer coating layer formed on the other surface of the porous substrate, the high heat resistance polymer coating layer including a high heat resistance polymer and inorganic particles dispersed in the high heat resistance polymer.

High heat resistance composite separator for lithium secondary battery and lithium secondary battery including same

Disclosed is a connecting structure and method between a grid and an electrode tab of a secondary battery, which may ensure stable connection between the grid and the electrode tab of an electrode assembly and allow improved productivity. The connecting structure includes a grid integrally extending from an electrode plate of a secondary battery, an electrode tab connected to the grid, and a laser welding portion connecting the grid and the electrode tab. Also, a connecting method between a grid and an electrode tab of a secondary battery includes (a) fixing the grid with a jig, (b) cutting the grid, and (c) stacking the grid and the electrode tab and connecting the grid and the electrode tab by means of laser welding.

Connecting structure and method between grid and electrode tab of secondary battery

The present invention relates to a core-shell type anode active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery comprising the same. The anode active material for a lithium secondary battery according to the present invention comprises a carbon based material core portion; and a shell portion formed outside of the carbon based material core portion by coating the carbon based material core portion with a spinel-type lithium titanium oxide. The anode active material for a lithium secondary battery according to the present invention has the metal oxide shell portion, and thus has the improved conductivity, a high output density, and consequently excellent electrical characteristics.

Core-shell type anode active material for lithium secondary battery, method for preparing the same and lithium secondary battery comprising the same

The present invention relates to a lithium secondary battery. More specifically, according to embodiments of the present invention the lithium battery, which includes a cathode, an anode, and a separate membrane inserted between the cathode and the anode, is characterized in that the separator membrane is a polyolefin porous membrane which has an aramid coating layer; and the cathode includes a lithium metal oxide cathode active material which has an olivine-type iron phosphate lithium coating layer, or the anode includes a carbon anode active material which has a spinel-type lithium titanium oxide coating layer. The lithium secondary battery in accordance with embodiments of the present invention has excellent basic electric performance and improved stability.

Lithium secondary battery

Disclosed is a separator for a lithium secondary battery and a lithium secondary battery comprising the same. The separator may include a thermoplastic polyolefin-based polymer porous sheet and an aramid-based non-woven fabric sheet stacked on at least one surface of the polyolefin-based polymer porous sheet, wherein the polyolefin-based polymer sheet and the aramid-based non-woven fabric sheet are adhered with an adhesive, and the adhesive loses an adhesive performance at 80&#xb0; C. or more to separate the two sheets. The separator has a shut-down function and excellent high-temperature shape stability.

Separator for lithium secondary battery and lithium secondary battery comprising the same

Provided are a core-shell type anode active material for lithium secondary batteries including a carbonaceous material core; and a shell formed outside the carbonaceous material core, the shell including a PTC (Positive Temperature Coefficient) medium. The core-shell type anode active material for lithium secondary batteries has the shell including the PTC medium, and thus has the improved conductivity and high output density, exhibiting excellent electrical characteristics. And, a lithium secondary battery manufactured using the anode active material has excellent safety, in particular safety against overcharge and external short circuit.

Core-shell type anode active material for lithium secondary batteries, method for preparing the same and lithium secondary batteries comprising the same

The present invention relates to a cathode active material for lithium secondary batteries with high safety, a method of preparing the same and lithium secondary batteries comprising the same. The cathode active material of the present invention comprises a lithium metal oxide secondary particle core portion formed by aggregation of lithium metal oxide primary particles; and a shell portion formed by coating the secondary particle core portion with an olivine-structured lithium iron phosphate oxide. The cathode active material of the present invention allows to manufacture lithium secondary batteries with improved safety, especially overcharge characteristics.

Cathode active material for lithium secondary batteries with core of lithium metal oxide and shell of lithium iron phosphate oxide, method of preparing the same, and lithium secondary batteries comprising the same

Disclosed are a cathode active material for lithium secondary batteries, a method for preparing the same, and lithium secondary batteries comprising the same. The cathode active material for lithium secondary batteries comprises a lithium metal oxide secondary particle core formed by aggregation of a plurality of lithium metal oxide primary particles; a first shell formed by coating the surface of the secondary particle core with a plurality of barium titanate particles and a plurality of metal oxide particles; and a second shell formed by coating the surface of the first shell with a plurality of olivine-type lithium iron phosphate oxide particles and a plurality of conductive material particles. The cathode active material for lithium secondary batteries allows manufacture of lithium secondary batteries having excellent thermal stability, high-temperature durability and overcharge safety.

Cathode active material for lithium secondary batteries, method for preparing the same, and lithium secondary batteries comprising the same

A cathode active material for a lithium secondary battery includes a lithium metal oxide secondary particle core formed by agglomerating lithium metal oxide primary particles; and a shell formed by coating the secondary particle core with barium titanate and metal oxide. This cathode active material allows making a lithium secondary battery having improved safety, particularly in thermal stability and overcharging characteristics.

Cathode active material for lithium secondary batteries with high safety, method of preparing the same and lithium secondary batteries comprising the same

A lithium secondary battery capable of preventing explosion or firing caused by the increase of inner pressure due to misusage is disclosed. The lithium secondary battery includes an electrode assembly having an anode plate, a cathode plate and a separator, a package having a receiving portion for receiving the electrode assembly and sealed and filled with electrolyte together with the electrode assembly, and an adhesive layer at least partially formed on an outer surface of the package. The lithium secondary battery functions as an explosion-proof safety device for preventing the package from exploding due to abrupt breakage of the package when the package is expanded due to the increase of inner pressure of the battery over a critical value.

Lithium secondary battery with high safety and manufacturing method thereof

An packing apparatus for an automated manufacturing system of a secondary lithium battery is disclosed. The packing apparatus comprises: a frame; a base member which is installed at the frame, and is provided with a receiving rack for receiving a batch of separator both surfaces of which are laminated with positive electrode plates and negative electrode plates in a predetermined pattern; a stopper member installed at the frame to be linearly movable so as to selectively approach one end of the base member for preventing the separator being supplied to the base member from being separated from the receiving rack; a folder member installed at the frame to be linearly movable with respect to the receiving rack so that the folder can press the separator supplied to a receiving space formed by the receiving rack and the stopper member for predetermined duration, and fold the separator so that both side sections of the folded separator can have the shape of 'Z', and the positive electrode plates and the negative electrode plates can alternate with each other; and a cutting/taping member for moving the separator folded in the shape of 'Z' to a predetermined area, cutting the separator at a non-electrode plate area to which no electrode plate is attached, and taping the folded and cut piece of separator.

Packing apparatus for an automated manufacturing system of lithium secondary battery

A method for treating electrode tabs of a crude cell for a lithium secondary battery, crude cell for a lithium secondary battery manufactured according to the method, and a lithium secondary battery employing the crude cell are disclosed. The method for treating electrode tabs of a crude cell provided with a plurality of anode plates having respective anode grids, a plurality of anode plates having respective anode grids, and a separator strip interposed, in a fold/fold manner, between the anode plates and the cathode plates which are disposed alternately, includes the steps of: (a) gathering the anode grids and the cathode grids, respectively, so that the grids can be close to a first surface and be substantially parallel to the first surface, and cutting the end portions of the anode grids and the cathode grids so that the anode grids and the cathode grids can have the shortest length required for being welded to respective tab members; (b) welding an anode tab member and a cathode tab member to respective end portions of the anode grids and the cathode grids to form an anode side welded portion and a cathode side welded portion having lengths as short as possible; (c) attaching insulating tape to the anode side welded portion and the cathode side welded portion so that the insulating tape can wrap the welded portions; (d) bending the anode grids and the cathode grids at respective first bend portions so that the grids can be close to a second surface which is opposite to the first surface, and be substantially perpendicular to the second surface; (e) bending the respective tab members at respective second bend portions so that the tab members can be close to the respective first bend portion, and be substantially parallel to the first surface.

Method for treating electrode tabs of crude cell for lithium secondary battery, and crude cell and lithium secondary battery according to the method

An automated manufacturing system of a secondary lithium battery is disclosed. The automated manufacturing system comprises: a frame; a supply unit having a separator roller installed at the frame to be rotatable so that a separator can be released from the separator roller, and can travel along a separator travel path; an adhesive applying unit disposed to have the separator travel path through the adhesive applying unit so as to continuously apply adhesive to both surfaces of the separator in a predetermined pattern; a lamination unit installed at the frame for laminating one adhesive applied surface of the separator with a plurality of positive electrode plates, and the other adhesive applied surface of the separator with a plurality of negative electrode plates simultaneously so that the electrode plates can correspond to the above pattern; a transporting unit installed at the frame to be rotatable while contacting the separator so as to cause the separator supplied from the supply unit to travel along the travel path at a predetermined speed and during predetermined time intervals via the adhesive applying unit and the lamination unit; a packing unit installed at the frame for folding and packing a batch of the separator which is laminated with the electrode plates by the lamination unit in a predetermined pattern and is transported by the transporting unit so that the positive electrode plates and the negative electrode plates can alternate with each other, and both side sections of the folded separator can have the shape of 'Z'; and an unloading unit installed at the frame to be movable for unloading the packed separator to a tray unit.

Growing community of inventors

Seoul, South Korea

Ji-Jun Hong