Abstract: According to an embodiment of the present invention, a method for preparing a graphite-titanium oxide composite comprises (S1) a surface-modifying graphite with benzyl alcohol or a cellulose-based material using a sol-gel method, (S2) distributing the surface-modified graphite in a solvent, adding a titanium precursor to the solvent, and mixing the titanium precursor with the surface-modified graphite to obtain a graphite-titanium mixture, and (S3) thermally treating the graphite-titanium mixture to grow a titanium oxide on a surface of the graphite.

Abstract: A method of preparing a silicon oxide (Six)-carbon composite for a negative-electrode active material of a lithium secondary battery, includes mixing silicon (Si) particles and a polymer material with an organic solvent, thus preparing a mixture solution, optionally electrospinning the mixture solution thus preparing a composite having a one-dimensional structure, and heat-treating the mixture solution or the composite having a one-dimensional structure. The silicon oxide (SiOx)-carbon composite can reduce volume expansion upon lithium ion insertion and can increase ionic conductivity and electronic conductivity and thus can maintain high capacity, making it possible to apply it to a lithium ion battery to thus improve electrochemical characteristics of the battery.

Abstract: The present invention relates to a positive electrode active material for a lithium ion battery and, more specifically, to a positive electrode active material for a lithium ion battery, having improved initial capacitance and charging and discharging efficiency due to increased electrical conductivity or ion conductivity. The positive electrode active material for a lithium ion battery of the present invention contains lithium vanadium phosphate (Li3V2(PO4)3) and lithium zirconium phosphate (Li3Zr2(PO4)3) formed on an external surface of the lithium vanadium phosphate. The positive electrode active material for a lithium ion battery comprising lithium vanadium zirconium phosphate (Li3V2-xZrx(PO4)3) particles, which is prepared by a preparation method of the present invention, has excellent structural stability and ion conductivity as well as high capacitance.

Abstract: A negative active material for rechargeable lithium batteries and a method of manufacturing the negative active material are provided. The negative active material for rechargeable lithium batteries includes at least one generally spherical assembly having flake-shaped materials that are capable of doping and dedoping lithium, and are arranged in a generally spherical shape defining a central pore. The negative active material imparts improved cycle-life characteristics.

Abstract: According to an embodiment of the present disclosure, a multi-acid anionic material-carbon fiber composite comprises carbon nanofibers and multi-acid anionic crystals stuck in the carbon nanofibers. Some of the multi-acid anionic crystals are exposed to an outside of the carbon nanofibers.

Abstract: Provided is a floating assembly. The floating assembly of the present invention comprises a plurality of containers having buoyancy by the air which fills the internal spaces of the containers by means of injection ports formed in one end of each container, an injection port lid which has a check valve for supplying air in one direction into the inside of the container, wherein the check valve arranged at the bottom surface of a lid member is coupled to the injection port, and which seals the injection port, and a container fixing unit having a plurality of fixing holes for the insertion and fixation of the containers, wherein the container fixing unit fixes the plurality of containers arranged in the vicinity of each other.

Abstract: The present invention relates to a lithium secondary battery comprising: a negative electrode to which a silicon-carbon composite is applied, the expansion of the volume of the silicon-carbon composite when a lithium ion is inserted being low and the silicon-carbon composite having excellent ion conductivity and electric conductivity to consistently maintain a high capacity; and an electrolyte for improving the electrochemical properties of the negative electrode. The lithium secondary battery of the present invention uses the silicon-carbon composite for a negative electrode active material so as to achieve the complexation of silicon and carbon fibers, and involves the coating of the surface of silicon particles with amorphous silica so as to reduce the expansion of volume when a lithium ion is inserted. The lithium secondary battery of the present invention has excellent ion conductivity and electric conductivity to consistently maintain high capacity.

Abstract: Disclosed is a silicon-carbon composite for a negative active material of a lithium secondary battery, including carbon nanofibers and silicon particles, wherein the silicon particles are coated with amorphous silica. In the silicon-carbon composite of the invention, silicon is provided in the form of a composite with carbon fibers and the surface of silicon particles is coated with amorphous silica, thereby reducing volume expansion upon lithium ion insertion and exhibiting superior ionic conductivity and electrical conductivity to thus maintain high capacity, and also, amorphous silica-coated silicon is positioned inside the carbon fibers having a one-dimensional structure, thus ensuring a large specific surface area and a stable composite structure.

Abstract: The present invention relates to negative active materials for rechargeable lithium batteries, manufacturing methods thereof, and rechargeable lithium batteries including the negative active materials. A negative active material for a rechargeable lithium battery includes a core including a material capable of carrying out reversible oxidation and reduction reactions and a coating layer formed on the core. The coating layer has a reticular structure.

Abstract: An embodiment of the present invention provides an electrode for a rechargeable lithium battery, including: a current collector; and an active material layer on the current collector, wherein the active material layer includes an active material adapted to reversibly intercalate and deintercalate lithium ions, a binder, and a pore-forming polymer.

Abstract: Negative active materials for rechargeable lithium batteries are provided. One negative active material includes a metal matrix, and an intermetallic compound including a Si active metal and an additive metal dispersed in the metal matrix. The additive metal may be Ca, Mg, Na, K, Sr, Rb, Ba, Cs, or a combination thereof. The metal matrix may comprise Cu and Al. The negative active material may comprise a X(aM-bSi)—Y(cCu-dAl) material, where X is from about 30 to about 70 wt %, Y is from about 30 to about 70 wt %, X+Y is 100 wt %, a+b is 100 wt %, a is from about 20 to 80 wt %, b is from about 20 to 80 wt %, c+d is 100 wt %, c is from about 80 to about 95 wt %, d is from about 5 to about 20 wt %, and M may be Ca, Mg, Na, K, Sr, Rb, Ba, Cs, or a combination thereof.

Abstract: Negative active materials and rechargeable lithium batteries including the negative active materials are provided. The negative active material includes an intermetallic compound of Si and a metal, and a metal matrix including Cu and Al. The negative active material may provide a rechargeable lithium battery having high capacity and excellent cycle-life and cell efficiency.

Abstract: A negative electrode for rechargeable lithium batteries includes a current collector, a porous active material layer having a metal-based active material disposed on the current collector, and a high-strength binder layer on the porous active material layer. The high-strength binder layer has a strength ranging from 5 to 70 MPa. The negative active material for a rechargeable lithium battery according to the present invention can improve cycle-life characteristics by suppressing volume expansion and reactions of an electrolyte at the electrode surface.

Abstract: Disclosed is a silicon-carbon composite for a negative active material of a lithium secondary battery, including carbon nanofibers and silicon particles, wherein the silicon particles are coated with amorphous silica. In the silicon-carbon composite of the invention, silicon is provided in the form of a composite with carbon fibers and the surface of silicon particles is coated with amorphous silica, thereby reducing volume expansion upon lithium ion insertion and exhibiting superior ionic conductivity and electrical conductivity to thus maintain high capacity, and also, amorphous silica-coated silicon is positioned inside the carbon fibers having a one-dimensional structure, thus ensuring a large specific surface area and a stable composite structure.

Abstract: A negative active material for a rechargeable lithium battery includes Si active particles, and a 3-component to 7-component metal matrix that surrounds the active fine particles without reacting therewith. The negative active material shows high capacity and improved cycle-life characteristics.

Abstract: A negative active material for a lithium rechargeable battery is provided. The negative active material includes an active metal core and a crack inhibiting layer disposed on a surface of the active metal core. The crack inhibiting layer includes a metal oxide.

Abstract: Negative active materials for rechargeable lithium batteries, methods of manufacturing the negative active materials, and rechargeable lithium batteries including the negative active materials are provided. One negative active material includes an active metal core and a crack inhibiting layer formed on the core. The crack inhibiting layer includes a carbon-based material.

Abstract: The negative electrode for a rechargeable lithium battery includes a current collector and a negative active material layer disposed on the current collector. The negative active material layer includes a metal-based negative active material and sheet-shaped graphite and has porosity of 20 to 80 volume %. The negative electrode for a rechargeable lithium battery can improve cell characteristics by inhibiting volume change and stress due to active material particle bombardment during charge and discharge, and by decreasing electrode resistance.

Abstract: The present invention relates to an active material for a rechargeable lithium battery and a rechargeable lithium battery including the same. The active material includes an active material and a fiber-shaped or tube-shaped carbon conductive material attached to the surface of the active material. The active material includes a conductive shell including a fiber-shaped or tube-shaped carbon conductive material and increases discharge capacity due to improved conductivity and improves cycle-life efficiency by maintaining paths between active material particles during charge and discharge cycles.

Abstract: The present invention relates to negative active materials for rechargeable lithium batteries, manufacturing methods thereof, and rechargeable lithium batteries including the negative active materials. A negative active material for a rechargeable lithium battery includes a core including a material capable of carrying out reversible oxidation and reduction reactions and a coating layer formed on the core. The coating layer has a reticular structure.