Abstract: A gadget for retroreflected signal measurement is disclosed. The gadget for measuring the retroreflected signal includes a partitioning wall; a portable terminal receiving portion disposed on one surface of the partitioning wall; a biosensor receiving portion disposed on the other surface of the partitioning wall and constructed to receive a biosensor therein; a light exit channel defined in the partitioning wall and at one side thereof; and a light-receiving channel adjacent to the light exit channel and defined in the partitioning wall, wherein light passes through the light exit channel and then is reflected from the biosensor, and then is incident into the light-receiving channel.

Abstract: A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer formed on the cathode current collector. The cathode active material layer includes cathode active material particles. The cathode active material particles include a lithium metal oxide particle containing nickel and having a mole fraction of cobalt of 0.02 or less among all elements except lithium and oxygen.

Abstract: A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer formed on the cathode current collector. The cathode active material layer includes a cathode active material and a conductive material ID/IG is in a range from 0.5 to 1.25 in a Raman spectrum of the cathode active material layer. The cathode active material includes lithium metal oxide particles containing nickel and manganese and having a content of cobalt of less than 2 mol % among all elements except for lithium and oxygen.

Abstract: An anode for a secondary battery includes a first anode mixture layer disposed on an anode current collector and a second anode mixture layer disposed on a surface of the anode, wherein the first and second anode mixture layers include a graphite-based anode active material of graphite secondary particles, at least the second anode mixture layer includes a graphite-based anode active material of graphite primary particles, and a content [A2] of graphite primary particles included in the second anode mixture layer is greater than a content [A1] of graphite primary particles included in the first anode mixture layer.

Abstract: An anode active material for a lithium secondary battery according to embodiments of the present invention includes a carbon-based active material and a silicon-based active material including silicon-based active material particles having a particle size distribution in a range from 1 ?m to 19 ?m. A lithium secondary battery having improved life-span and rapid charge/discharge properties at room temperature is provided.

Abstract: Lithium secondary batteries for improving life span and resistance properties are disclosed. In an aspect, a cathode composition for a lithium secondary battery includes a cathode active material that includes a first cathode active material particle having a secondary particle shape and a second cathode active material particle having a single particle shape, and a conductive material including a linear-type conductive material.

Abstract: Provided are a negative electrode for a secondary battery including: a current collector; a first coating layer including a point-type conductive material and a binder, formed on the current collector; and a second coating layer including a silicon-based active material, formed on the first coating layer, and a lithium secondary battery including the same.

Abstract: An anode for a secondary battery includes an anode current collector, and an anode active material layer including a first anode active material layer and a second anode active material layer sequentially stacked from a surface of the anode current collector. Each of the first anode active material layer and the second anode active material layer includes a carbon-based active material and a silicon-based active material as an anode active material, and a carbon nanotube as a conductive material. A content of the silicon-based active material in the second anode active material layer is greater than a content of the silicon-based active material in the first anode active material layer. A Raman R value of the carbon nanotube included in the second anode active material layer is smaller than a Raman R value of the carbon nanotube included in the first anode active material layer.

Abstract: Provided is a positive electrode for a lithium secondary battery including: a current collector; and a positive electrode active material layer including a positive electrode active material and carbon nanotubes, placed on the current collector, wherein the carbon nanotubes have ID/IG of 0.10 or less, the ID/IG being a ratio of a peak intensity of a D band divided by a peak intensity of a G band in a Raman spectrum.

Abstract: The present invention provides an anode for a secondary battery, which includes an anode current collector and an anode active material layer which is formed on the anode current collector, and includes a silicon-based active material and a conductive material including single-walled carbon nanotubes. The single-walled carbon nanotube has a Raman R value (a D band peak intensity (Id)/a G band peak intensity (Ig)) of 0.01 to 0.1.