Abstract: A method for preparing a negative electrode active material, which includes mixing green coke particles, calcined coke particles, and a binder to obtain a mixture, and graphitizing the mixture through heat treatment to form an artificial graphite particles in the form of a secondary particle in which primary artificial graphite particles are bonded to each other, wherein an average particle diameter (D50) of the green coke particles is greater than an average particle diameter (D50) of the calcined coke particles.

Abstract: A negative electrode active material for a secondary battery including: natural graphite particles; and a carbon coating layer on a surface and in an inside of the natural graphite particles. The negative electrode active material for a secondary battery has a porosity of 3% to 13%.

Abstract: A method for preparing a graphene nanosheet, wherein the method includes preparing an electrode assembly comprising a negative electrode, wherein the negative electrode comprises artificial graphite, a lithium metal counter electrode opposing the negative electrode, and a separator interposed between the negative electrode and the lithium metal counter electrode, and immersing the electrode assembly in an electrolyte, electrochemically charging the immersed electrode assembly to form a charged electrode assembly, separating the artificial graphite from the charged electrode assembly to form separated artificial graphite, and de-laminating a graphene nanosheet from the separated artificial graphite, wherein the initial discharge capacity of the negative electrode is 350 mAh/g or greater, and the electrolyte comprises an organic solvent comprising a cyclic carbonate and a linear carbonate, and a lithium salt.

Abstract: Disclosed is a negative electrode, including: a negative electrode current collector; and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector, and having a lower layer region containing a first active material and a first binder polymer, and an upper layer region disposed on the lower layer region and containing a second active material and a second binder polymer, wherein the first active material includes primary particles of artificial graphite, the second active material includes secondary particles of artificial graphite and a carbon coating layer disposed on the secondary particles, and the weight percentage (wt %) of the first binder polymer in the lower layer region is larger than the weight percentage (wt %) of the second binder polymer in the upper layer region. Also disclosed are a method for manufacturing the negative electrode and a lithium secondary battery including the negative electrode.

Abstract: The present invention provides a negative electrode for a lithium secondary battery, which includes a negative electrode current collector; and a negative electrode active material layer which is formed on the negative electrode current collector and includes a negative electrode active material including a silicon-based material, wherein the negative electrode active material includes lithium intercalated by pre-lithiation, and the extent of pre-lithiation of the negative electrode active material, calculated by a specific equation, is 5 to 50%.

Abstract: A negative electrode including a negative electrode current collector, and a negative electrode active material layer on at least one surface of the negative electrode current collector is disclosed. The negative electrode active material layer includes a negative electrode active material, which includes a first negative electrode active material and a second negative electrode active material. The first negative electrode active material is coated artificial graphite particles including primary artificial graphite particles and an amorphous carbon coating layer on a surface of the primary artificial graphite particles. The second negative electrode active material is uncoated artificial graphite particles in the form of secondary particles in which two or more primary artificial graphite particles are assembled. A ratio of an average particle diameter (D50) of the second negative electrode active material to an average particle diameter (D50) of the first negative electrode active material ranges from 1.

Abstract: A negative electrode including a negative electrode active material layer including a negative electrode active material, wherein the negative electrode active material includes a core and a coating layer disposed on the core. The core includes natural graphite and an amorphous carbon layer on the natural graphite, wherein the natural graphite has an average particle diameter, D50, of 10 ?m to 14 ?m.ONH The negative electrode active material includes 1,500 ppm wt % to 2,000 ppm wt % of oxygen, 200 ppm wt % to 300 ppm wt % of nitrogen, and 200 ppm wt % to 300 ppm wt % of hydrogen as measured by an ONH analysis, and the coating layer includes carbon nanofibers.

Abstract: A method for manufacturing negative electrode active material including the steps of manufacturing a pellet by extruding a mixture of lithium metal and negative electrode active material, immersing the pellet in an electrolyte comprising an SEI film-forming additive, and manufacturing the pellet into powder form by grinding, washing and drying same. A negative electrode and a lithium rechargeable battery manufactured using the lithium-active material powder has an SEI film that is uniformly formed by having lithium uniformly doped in the negative electrode. During initial charging, the SEI film is stably formed, and thus an effect is achieved whereby the initial efficiency of the lithium rechargeable battery is improved.

Abstract: A negative electrode active material including secondary particles wherein at least two primary particles are aggregated, wherein the primary particles include primary natural graphite particles and an amorphous carbon coating layer on at least a portion of a surface of the primary natural graphite particles. The negative electrode active material has a pore volume of 0.06 mL/g to 0.15 mL/g as measured by a Hg porosimeter.

Abstract: In the case in which a lithium metal is used in order to increase the capacity of a lithium secondary battery, reversibility of charging and discharging is reduced due to dendrite, etc. A lithium metal having LiF deposited thereon exhibits high stability, whereby reversibility of charging and discharging is increased. In addition, in the case in which LiF is deposited, the lithium metal, which is a negative electrode material, is not consumed, and the shape of a lithium metal electrode is not greatly changed.

Abstract: A method of producing a negative electrode for a lithium secondary battery. The production method of the present invention includes a process of charging the negative electrode at a low current during pre-lithiation and a process of aging the negative electrode after the pre-lithiation for a sufficient time, thereby producing a negative electrode for a lithium secondary battery having excellent cycle performance.

Abstract: Disclosed is a negative electrode, including: a negative electrode current collector; and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector, and having a lower layer region containing a first active material and a first binder polymer, and an upper layer region disposed on the lower layer region and containing a second active material and a second binder polymer, wherein the first active material includes primary particles of artificial graphite, the second active material includes secondary particles of artificial graphite and a carbon coating layer disposed on the secondary particles, and the weight percentage (wt %) of the first binder polymer in the lower layer region is larger than the weight percentage (wt %) of the second binder polymer in the upper layer region. Also disclosed are a method for manufacturing the negative electrode and a lithium secondary battery including the negative electrode.

Abstract: A negative electrode for a lithium secondary battery, a negative electrode in which the negative electrode is pre-lithiated, a method of manufacturing the negative electrode, and a lithium secondary battery including the negative electrode. The pre-lithiated negative electrode may increase the capacity and improve the electrochemical performance of a lithium secondary battery by securing the initial reversibility of a negative electrode.

Abstract: A negative electrode active material including artificial graphite particles is disclosed. During torque rheometer measurement of a sample consisting of the negative electrode active material and water, a solid content value when the sample has a maximum torque value, which is measured by a specific method, is 69.5 wt % or more. If the solid content value, when the sample has the maximum torque value during the torque rheometer measurement, satisfies the above range, powder flowability of the negative electrode active material may be evaluated as excellent. When the negative electrode active material is present in a negative electrode slurry, dispersibility and phase stability may be improved. Thus, the negative electrode slurry including the negative electrode active material of the present disclosure and a negative electrode and a secondary battery, which are prepared therefrom, may have improved productivity and quality.

Abstract: A negative electrode for a lithium secondary battery, a method of producing the negative electrode, a method of producing a pre-lithiated negative electrode by pre-lithiation of the negative electrode, and a lithium secondary battery including the negative electrode. The negative electrode can increase the capacity of a battery and improve the electrochemical performance by securing the initial reversibility of a negative electrode by pre-lithiation, and allow lithium ions to be diffused into a negative electrode active material layer during pre-lithiation without being lost.

Abstract: Disclosed is a negative electrode including a negative electrode current collector, a lower negative electrode active material layer disposed on one or both surfaces of the negative electrode current collector, and an upper negative electrode active material layer disposed on a surface of the lower negative electrode active material layer opposite the negative electrode current collector. The lower negative electrode active material layer includes a first negative electrode active material including natural graphite particles and a second negative electrode active material including artificial graphite particles in a form of primary particles. The upper negative electrode active material layer includes third negative electrode active material including artificial graphite particles in a form of secondary particles in which two or more primary particles are assembled. A pore volume of the first negative electrode active material is 0.06 mL/g or less as measured by mercury porosimetry.

Abstract: A negative electrode for a secondary battery including: a negative electrode current collector; and a negative electrode active material layer present on the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material, wherein the negative electrode active material for a secondary battery includes natural graphite, and has a sphericity of 0.58 to 1, a tap density of 1.08 g/cc to 1.32 g/cc, and Dmax?Dmin of 16 ?m to 19 ?m, wherein Dmax?Dmin is a difference between a maximum particle diameter Dmax and a minimum particle diameter Dmin in a particle size distribution.

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 and a secondary battery including the negative electrode. The negative electrode including a current collector and a negative electrode active material layer, wherein the negative electrode active material layer includes negative electrode active material particles, the negative electrode active material particles include natural graphite particles and a carbon coating layer disposed on the natural graphite particles. The negative electrode active material particles have a D50 of 6 ?m to 9.2 ?m and a half-width of 5.0 ?m to 5.5 ?m based on a particle size distribution, and the specific surface area of the negative electrode active material particles is from 0.6 m2/g to 2.2 m2/g.

Abstract: A separator including: a porous polymer substrate having a plurality of pores; and a coating layer formed on at least one surface of the porous polymer substrate, and including a plurality of lithium-containing composite particles and a binder positioned on the whole or a part of the surface of the lithium-containing composite particles to connect and fix the lithium-containing composite particles with each other, wherein the lithium-containing composite particles includes a lithiated compound and a passivation film formed on the surface of the lithiated compound, and the passivation film includes a solid electrolyte interface (SEI). A lithium secondary battery including the separator and a method for manufacturing the lithium secondary battery are also provided.