Abstract: A lithium secondary battery, and a method of making the same, including a positive electrode, a separator and a negative electrode, in which the positive electrode includes a lithium composite transition metal compound including nickel (Ni) and cobalt (Co), the negative electrode includes a silicon-based active material and a carbon-based active material, the efficiency constants of the silicon-based active material and the carbon-based active material and the efficiency constant of the lithium composite transition metal compound satisfy an efficiency balance defined by Equation 1.

Abstract: A negative electrode for a secondary battery, including: a current collector; a first negative electrode active material layer provided on the current collector; and a second negative electrode active material layer provided on the first negative electrode active material layer, in which the first and second negative electrode active material layers include a silicon-based active material and natural graphite, the natural graphite has an average particle diameter (D50) of 10 ?m or less, and the OI (004/110) of the first and second negative electrode active material layers is 8 or less, and a secondary battery including the same.

Abstract: A positive electrode material comprising: a first positive electrode active material in the form of single particles; and a second positive electrode active material in the form of single particles which has a lager particle diameter than that of the first positive electrode active material, wherein at least one of the first or second positive electrode active materials has a coating layer comprising boron (B) and cobalt (Co) provided on at least a portion of a surface of the single particle, and a positive electrode and a secondary battery including the same.

Abstract: A negative electrode for a secondary battery, including: a current collector; a first negative electrode active material layer provided on the current collector; and a second negative electrode active material layer provided on the first negative electrode active material layer, in which at least one of the first and second negative electrode active material layers includes a lithium-substituted carboxymethyl cellulose, and the second negative electrode active material layers includes a silicon-based active material, and a secondary battery including the same.

Abstract: A negative electrode material including natural graphite particles having a BET specific surface area ranging from 1.0 m2/g to 2.4 m2/g, and artificial graphite particles having a BET specific surface area ranging from 0.5 m2/g to 2.0 m2/g. An average particle diameter (D50) of the natural graphite particles is larger than an average particle diameter (D50) of the artificial graphite particles.

Abstract: The present invention relates to a composite negative electrode material for a secondary battery, and a negative electrode and a lithium secondary battery which include the same, and particularly to a composite negative electrode material for a secondary battery, which includes a graphene sheet, and two or more coating layers formed on both sides of the graphene sheet, wherein the two or more coating layers include at least one polymer coating layer and at least one pitch coating layer, and the graphene sheet and the two or more coating layers are included in a weight ratio of greater than 1:greater than 0.01 to less than 0.1, and a negative electrode and a lithium secondary battery which include the same.

Abstract: A negative electrode for secondary battery includes a negative electrode current collector; a first active material layer in which a first negative electrode slurry containing a first negative electrode active material is coated onto the negative electrode current collector; and a second active material layer in which a second negative electrode slurry containing a second negative electrode active material is coated onto the first active material layer, wherein the first negative electrode active material contains natural graphite having an mesopore volume of 0.6*10?3 cm3/g or more and 2.5*10?3 cm3/g or less, and the second negative electrode active material contains artificial graphite.

Abstract: A spheronized carbonaceous negative electrode active material and a method of preparing a spheronized carbonaceous negative electrode active material, which has an average particle diameter (D50) of 8.5-10.5 ?m, a minimum particle diameter (Dmin) of 2.3 ?m or more, and a tap density of 1.00-1.20 g/cc.

Abstract: A negative electrode active material including artificial graphite secondary particles comprising artificial graphite primary particles having an average particle diameter (D50) of 10 nm to 9 ?m, said artificial graphite secondary particles being formed by granulating said artificial graphite primary particles, wherein a value (V1) obtained by dividing a minimum particle diameter (Dmin) of the secondary particles by the average particle diameter (D50) of the initial particles is 0.50 to 0.8, and a value (V2) obtained by dividing the minimum particle diameter (Dmin) of the secondary particles by an average particle diameter (D50) of the secondary particles is 0.23 to 0.4.

Abstract: A negative electrode active material for an electrochemical device which has improved quick charging characteristics. The negative electrode active material includes two types of graphite particles having a different particle diameter and shows a bimodal distribution, wherein the ratio of the average particle diameter (D50) of the first graphite particles to the average particle diameter (D50) of the second graphite particles is larger than 1.7.

Abstract: A negative electrode for a lithium secondary battery including a negative electrode active material layer. The negative electrode active material layer is formed by steps of coating a negative electrode mixture slurry including spheroidized natural graphite particles as a negative electrode active material on at least one surface of a negative electrode current collector, followed by drying and pressing the negative electrode mixture slurry on the at least one surface of the negative electrode current collector. The spheroidized natural graphite particles include a plurality of pores. The negative electrode active material layer has a Brunauer-Emmett-Teller (BET) specific surface area of the negative electrode active material layer after the pressing is larger than a BET specific surface area of the negative electrode active material layer before pressing. A difference in the BET specific surface area before and after pressing ranges from 0.9 m2/g to 1.2 m2/g.

Abstract: A negative electrode active material including artificial graphite secondary particles comprising artificial graphite primary particles having an average particle diameter (D50) of 10 nm to 9 ?m, said artificial graphite secondary particles being formed by granulating said artificial graphite primary particles, wherein a value (V1) obtained by dividing a minimum particle diameter (Dmin) of the secondary particles by the average particle diameter (D50) of the initial particles is 0.50 to 0.8, and a value (V2) obtained by dividing the minimum particle diameter (Dmin) of the secondary particles by an average particle diameter (D50) of the secondary particles is 0.23 to 0.4.

Abstract: The present invention relates to a negative electrode and a secondary battery including the same, and particularly, to a negative electrode which includes a negative electrode active material layer including first active material particles each in the form of a secondary particle in which a plurality of primary particles are agglomerated; and second active material particles, wherein the second active material particles have an average particle size (D50) equal to or less than an average particle size (D50) of the primary particles, the first active material particle is artificial graphite, and the second active material particle is a graphite-based particle, and a secondary battery, a battery module, and a battery pack including the same.

Abstract: A negative electrode active material for an electrochemical device which has improved quick charging characteristics. The negative electrode active material includes two types of graphite particles having a different particle diameter and shows a bimodal distribution, wherein the ratio of the average particle diameter (D50) of the first graphite particles to the average particle diameter (D50) of the second graphite particles is larger than 1.7.

Abstract: The present invention relates to a negative electrode and a secondary battery including the same, and particularly, to a negative electrode which includes a negative electrode active material layer including first active material particles each in the form of a secondary particle in which a plurality of primary particles are agglomerated; and second active material particles, wherein the second active material particles have an average particle size (D50) equal to or less than an average particle size (D50) of the primary particles, the first active material particle is artificial graphite, and the second active material particle is a graphite-based particle, and a secondary battery, a battery module, and a battery pack including the same.

Abstract: The present invention relates to a composite negative electrode material for a secondary battery, and a negative electrode and a lithium secondary battery which include the same, and particularly to a composite negative electrode material for a secondary battery, which includes a graphene sheet, and two or more coating layers formed on both sides of the graphene sheet, wherein the two or more coating layers include at least one polymer coating layer and at least one pitch coating layer, and the graphene sheet and the two or more coating layers are included in a weight ratio of greater than 1:greater than 0.01 to less than 0.1, and a negative electrode and a lithium secondary battery which include the same.

Abstract: The present invention relates to the microsphere whose surface is covered with hot spots and the method for identifying chemicals through Surface Enhanced Raman Scattering (SERS) using the same. The microsphere having hot spots, according to the present invention, includes a microsphere and metal networks as a shell which covers the surface of the microsphere, and nano-sized pores are distributed randomly on the surface or in the interstitial space of the metal networks. The microsphere having hot spots, according to the present invention, can be individually manipulated under a conventional optical microscope. SERS spectra of the monolayer of molecules on Pt or Au can be measured using single microsphere having hot spots mentioned as a sensitive probe. The microsphere having hot spots can be applied for decoding the microspheres with Raman tags flowing in a microfluidic system.