Abstract: An anode active material including a porous silicon having pores with a uniform average pore diameter, wherein the average pore diameter of the pores is in a range of about 50 nm to about 80 nm, a method of preparing the anode active material, and a lithium secondary battery including an anode including the anode active material.

Abstract: A positive active material for a rechargeable lithium battery includes a positive active material compound including a metal compound for intercalating and deintercalating lithium, a coating particle having an embedded portion embedded into the active material compound and a protruding portion protruding from the surface of the active material, and a rechargeable lithium battery including the positive active material.

Abstract: An electrode for a lithium secondary battery including a silicon-based alloy having an expansion coefficient of 10% or greater and an electrochemically inactive whisker, and a lithium secondary battery using the electrode for a lithium secondary battery.

Abstract: An electrode active material for a lithium secondary battery, a method of preparing the electrode active material, an electrode for a lithium secondary battery which includes the same, a lithium secondary battery using the electrode. The electrode active material includes a core active material and a coating layer including magnesium aluminum oxide (MgAlO2) and formed on the core active material. 1s binding energy peaks of oxygen (O) in the electrode active material measured by x-ray photoelectron spectroscopy (XPS) are shown at positions corresponding to 529.4±0.5 eV, about 530.7 eV, and 531.9±0.5 eV, and a peak intensity at the position corresponding to 529.4±0.5 eV is stronger than a peak intensity at the position corresponding to about 530.7 eV.

Abstract: A negative active material, a negative electrode, a lithium battery including the negative active material, and a method of manufacturing the negative active material, the negative electrode, and the lithium battery. The negative active material includes a silicon-based alloy including Si, Ti, Ni, and Fe components. The silicon-based alloy includes a Ti2Ni phase as an inactive phase and active silicon having a lower content than that of typical silicon-based alloys. The negative active material may improve discharge capacity and lifetime characteristics of lithium batteries.

Abstract: Disclosed is a solid electrolyte including particles comprising Li(1+x)Ti(2-x)Alx(PO4)3 (0?x?1) having a true density of about 2.20 to about 2.50 g/cm3.

Abstract: A negative active material, a lithium battery including the negative active material, and a method of preparing the negative active material. The negative active material includes a silicon-based alloy including Si, Al, and Fe. The silicon-based alloy includes an active phase of silicon nanoparticles and an inactive phase of Si3Al3Fe2 and Si2Fe in a ratios suitable to improve the lifespan of the lithium battery.

Abstract: A positive active material for a rechargeable lithium battery, a method of manufacturing the same, and a rechargeable lithium battery using the same, the positive active material including a secondary particle formed of a plurality of primary particles, the primary particles being made of a metal compound capable of intercalating/deintercalating lithium; and a coating layer on a surface of the secondary particle in an island arrangement, the coating layer including a metal oxide, wherein the secondary particle includes pores formed by the primary particles, the pores including a surface pore on the surface of the secondary particle and an internal pore inside the secondary particle, and the metal oxide of the coating layer fills a portion of the surface pore of the secondary particle.

Abstract: In an aspect, an electrode active material for a lithium secondary battery, the electrode active material including a silicon-based alloy and a coating film containing a polymer that includes a 3,4-ethylenedioxythiophene repeating unit and an oxyalkylene repeating unit, coated on the surface of the silicon-based alloy are provided.

Abstract: An anode active material including a porous silicon having pores with a uniform average pore diameter, wherein the average pore diameter of the pores is in a range of about 50 nm to about 80 nm, a method of preparing the anode active material, and a lithium secondary battery including an anode including the anode active material.

Abstract: Disclosed is a rechargeable lithium battery including: a positive electrode; a negative electrode including a negative current collector including a copper foil having elongation of about 5% to about 10% and a particle size of about 1 ?m to about 20 ?m, and a negative active material layer provided on the negative current collector; and an electrolyte solution.

Abstract: An anode active material, a lithium battery including the anode active material, and a method of preparing the anode active material are provided. The anode active material includes an alloy containing silicon (Si), titanium (Ti) and nickel (Ni) elements, wherein the alloy includes a Si phase and an alloy phase, and a peak intensity ratio (I(111)/I(220)) of Si(111) to Si(220) plane in a X-ray diffraction spectrum of the Si phase is from about 1.0 to about 1.5.

Abstract: A negative active material, a negative electrode, a lithium battery including the negative active material, and a method of manufacturing the negative active material, the negative electrode, and the lithium battery. The negative active material includes a silicon-based alloy including Si, Ti, Ni, and Fe components. The silicon-based alloy includes a Ti2Ni phase as an inactive phase and active silicon having a lower content than that of typical silicon-based alloys. The negative active material may improve discharge capacity and lifetime characteristics of lithium batteries.

Abstract: A solid electrolyte for a rechargeable lithium battery includes a compound represented by Li1+xTi2?xAlxMy(PO4)3-y, and a glass-based oxide selected from LiPO3, Li2O—B2O3, and combinations thereof. A rechargeable lithium battery includes the solid electrolyte.

Abstract: A solid electrolyte includes a sulfide-based electrolyte and a coating film including a water-resistant, lithium conductive polymer on a surface of the sulfide-based electrolyte, a method of preparing the solid electrolyte, and a lithium battery including the solid electrolyte.

Abstract: A negative active material, a lithium battery including the negative active material, and a method of preparing the negative active material. The negative active material includes a silicon-based alloy including Si, Al, and Fe. The silicon-based alloy includes an active phase of silicon nanoparticles and an inactive phase of Si3Al3Fe2 and Si2Fe in a ratios suitable to improve the lifespan of the lithium battery.

Abstract: An electrode for a lithium secondary battery including a silicon-based alloy having an expansion coefficient of 10% or greater and an electrochemically inactive whisker, and a lithium secondary battery using the electrode for a lithium secondary battery.

Abstract: A composite includes a compound selected from the group consisting of a lithium lanthanum zirconium oxide and a lithium lanthanum tantalum oxide; a lanthanum oxide; and an oxide selected from the group consisting of a lanthanum zirconium oxide and a lanthanum tantalum oxide. An electrode active material for a secondary lithium battery may include such composite. Methods of preparing the composite, an electrode for a secondary lithium battery including the electrode active material, and a secondary lithium battery including the electrode are disclosed.

Abstract: In an aspect, an electrode active material for a lithium secondary battery, the electrode active material including a silicon-based alloy and a coating film containing a polymer that includes a 3,4-ethylenedioxythiophene repeating unit and an oxyalkylene repeating unit, coated on the surface of the silicon-based alloy are provided.

Abstract: A composite anode active material, an anode including the composite anode active material, a lithium battery including the anode, and a method of preparing the composite anode active material, the composite anode active material including a core including a ternary alloy, the ternary alloy being capable of intercalating and deintercalating lithium; and a carbonaceous coating layer on the core.