Abstract: A negative electrode whose rapid charging performance and lifetime characteristics are excellent and a secondary battery including the negative electrode. The negative electrode includes a current collector and a negative electrode active material layer on at least one surface of the current collector. The negative electrode active material layer includes a negative electrode active material. The negative electrode active material includes uncoated artificial graphite particles consisting of secondary particles formed by agglomerating a plurality of primary particles, the primary particles have an average particle diameter (D50) of 7 ?m to 10 ?m, the secondary particles have an average particle diameter (D50) of 15 ?m to 20 ?m, and the uncoated artificial graphite particles have a crystallite size along the a-axis (La(100)) of 200 nm to 300 nm and a crystallite size along the c-axis (Lc(002)) of 50 nm to 100 nm as analyzed by XRD.

Abstract: A negative electrode active material for a lithium secondary battery, a lithium secondary battery including the same, and a method for preparing the negative electrode active material is disclosed. The negative electrode active material includes a porous carbon coating layer self-bound to a surface of a carbonaceous material. The porous carbon coating later contains porous carbon particles, and thus shows reduced resistance during lithium-ion intercalation on the surface of the carbonaceous material and provides improved surface reactivity and structural stability. This provides improved high-rate charge characteristics, while causing no deterioration of charge/discharge efficiency and life characteristics, when being used as a negative electrode active material for a lithium secondary battery. The self-bound amorphous carbon coating layer may optionally have a controlled pore structure through chemical etching.

Abstract: A method for pre-lithiating a silicon oxide negative electrode for a secondary battery, specifically a method for pre-lithiation by immersing the silicon oxide negative electrode in an electrolytic solution for wetting, and by applying pressure while a lithium metal is in direct contact with the wetted silicon oxide negative electrode. The silicon oxide negative electrode for a secondary battery manufactured through pre-lithiation provided in the present disclosure has improved initial irreversibility, and a secondary battery manufactured using such a silicon oxide negative electrode for a secondary battery has excellent charge/discharge efficiency.

Abstract: A lithium secondary battery, wherein there is a pre-lithiated negative electrode such that a total irreversible capacity of a positive electrode is greater than a total irreversible capacity of the negative electrode while satisfying 150< (negative electrode discharge capacity/lithium secondary battery discharge capacity)×100<300, and a relative potential of the negative electrode with respect to lithium metal in an operating voltage range of the lithium secondary battery is in a range of ?0.1 V to 0.7 V. Such a lithium secondary battery is capable of maintaining a capacity retention of 60% or more even after 500 cycles or more while achieving an energy density per volume of 800 Wh/L or more.

Abstract: A negative electrode for a lithium secondary battery, in which a LiF layer comprising amorphous LiF in an amount of 30 mol % or more is formed on a negative electrode active material layer comprising a carbon-based active material, a lithium secondary battery comprising the same, and a preparation method thereof.

Abstract: A method for preparing artificial graphite, including the steps of: pulverizing a carbonaceous material; carrying out a first deferrization to remove magnetic foreign materials generated by pulverizing the carbonaceous material to form a first deferrization product; granulating the first deferrization product of the first deferrization step to form a granulated product; graphitizing the granulated product to form a graphitized product; and carrying out a second deferrization on the graphitized product to remove magnetic foreign materials from the graphitized product to form the artificial graphite. A negative electrode including the artificial graphite and a lithium secondary battery including the negative electrode are also disclosed.

Abstract: A negative electrode active material, including: a graphite core; a first carbon coating layer on the graphite core; and a second carbon coating layer on the first carbon coating layer, wherein a crystallinity of the second carbon coating layer is lower than a crystallinity of the first carbon coating layer, or the second carbon coating layer includes hard carbon and the first carbon coating layer includes soft carbon. A negative electrode including the negative electrode active material and a lithium secondary battery including the same are also disclosed.

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: A negative electrode for a lithium-metal secondary battery, which has a wide specific surface area and a current density distribution that can be uniformly implemented, and a lithium-metal secondary battery including the same.

Abstract: A method for manufacturing a lithium secondary battery, including the steps: (S1) forming a preliminary negative electrode by coating a negative electrode slurry including a negative electrode active material, conductive material, binder and a solvent onto at least one surface of a current collector, followed by drying and pressing the negative electrode slurry coated current collector, to form a negative electrode active material layer surface on the current collector; (S2) coating lithium metal foil onto the negative electrode active material layer surface of the preliminary negative electrode in the shape of a pattern in which pattern units are arranged; (S3) cutting the preliminary negative electrode on which the lithium metal foil is pattern-coated to obtain negative electrode units; (S4) impregnating the negative electrode units with an electrolyte to obtain a pre-lithiated negative electrode; and (S5) assembling the negative electrode obtained from step (S4) with a positive electrode and a separator.

Abstract: A negative electrode active material including natural graphite. The negative electrode active material has a ratio of D90 to D10, which is D90/D10, of 2.0 to 2.2, a tap density of 1.11 g/cm3 to 1.19 g/cm3, and a BET specific surface area of 2.02 m2/g to 2.30 m2/g.

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 for a lithium secondary battery, which includes a negative electrode active material layer formed on a negative electrode collector, and a coating layer formed on the negative electrode active material layer and which includes lithium metal and metal oxide, a lithium secondary battery including the same, and a method of preparing the negative electrode.

Abstract: A negative electrode and a secondary battery including the negative electrode, the negative electrode includes a negative electrode active material layer, the negative electrode active material layer includes a negative electrode active material, the negative electrode active material includes a carbon-based negative electrode active material particles. Each carbon-based negative electrode active material particle includes a core comprising a plurality of flake artificial graphite primary particles; natural graphite present on the core; and an amorphous carbon-based material, wherein the natural graphite is present in the carbon-based negative electrode active material particles in an amount of 10 wt % to 30 wt %, and the carbon-based negative electrode active material particles have a sphericity of 0.78 to 0.83.

Abstract: A method for preparing a spheronized carbonaceous negative electrode active material, including the steps of: mixing microgranular scaly graphite with macrogranular scaly graphite, wherein the macrogranular scaly graphite has a larger average particle diameter than the microgranular scaly graphite, to form a mixture, and spheronizing the mixture to prepare spheronized granulated particles; carrying out carbon coating of the spheronized granulated particles; and disintegrating the carbon-coated spheronized granulated particles.

Abstract: A method for pre-lithiation of a negative electrode for a secondary battery, for reducing the time required for pre-lithiation and reducing changes in volume of the electrode. The method includes immersing a negative electrode for a secondary battery in the electrolyte to perform electrolyte impregnation, and pre-lithiating the negative electrode. Immersing the negative electrode for the secondary battery in an electrolyte includes introducing the prepared negative electrode into an electrolyte bath containing the electrolyte, and removing air bubbles and moisture in the negative electrode by applying a vacuum to the electrolyte bath in which the negative electrode is immersed.

Abstract: A method for preparing a spheronized carbonaceous negative electrode active material, including the steps of: mixing scaly graphite, solid pitch and liquid pitch to form a mixture, and spheronizing the mixture to prepare spheronized granulated particles; firing the spheronized granulated particles; carrying out carbon coating of the fired spheronized granulated particles to form carbon-coated spheronized granulated particles; heat treating the carbon-coated spheronized granulated particles; and disintegrating the heat treated carbon-coated spheronized granulated particles.

Abstract: A lithium secondary battery including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, wherein the negative electrode is lithiated by pre-lithiation, a total capacity of a negative electrode active material of the negative electrode is larger than a total capacity of a positive electrode active material of the positive electrode, and a charge capacity of the negative electrode is smaller than a charge capacity of the positive electrode by the pre-lithiation.

Abstract: Provided is a solid state battery which solves the problems of the conventional solid state battery, and is effectively inhibited from a dimensional change caused by charging/discharging, an increase in internal resistance and degradation of charging/discharging characteristics or cycle life at a high current. The solid state battery is provided with an electrode active material layer including a negative electrode active material, a solid electrolyte and a conductive material, wherein the negative electrode active material includes a carbonaceous material and the carbonaceous material includes a plurality of pores, a porosity of 10-60 vol %, and a pore size of 100-300 nm based on the largest diameter of the pores.

Abstract: A pre-lithiation apparatus that pre-lithiates a negative electrode structure having a first surface on which a negative electrode is disposed to produce a negative electrode unit of a battery, the apparatus includes a first roll rotatable to wind or unwind the negative electrode structure before the pre-lithiation is performed, a second roll installed to be spaced apart from the first roll and rotatable to wind and collect the negative electrode structure, on which the pre-lithiation is performed, and a lithium roll crossing a direction in which the negative electrode structure is transferred from the first roll to the second roll to come into contact with at least one of a first surface and a second surface of the negative electrode structure while being transferred from the first roll to the second roll. The lithium roll includes a lithium foil and an elastic member.