2results about How to "Capacity retention" patented technology

The present invention relates to an anode comprising: an anode current collector; and an anode active material layer disposed on at least one surface of the anode current collector, wherein the anode active material layer comprises an anode active material. The anode active material comprises a first anode active material and a second anode active material, wherein the first anode active material comprises coated-artificial graphite particles including primary artificial graphite particles and an amorphous carbon coating layer positioned on the primary artificial graphite particles, and the second anode active material comprises uncoated-artificial graphite particles in the form of secondary particles in which two or more primary artificial graphite particles are assembled. The ratio of the average particle diameter (D50) of the second anode active material to the average particle diameter (D50) of the first anode active material is between 1.2 and 4.7.

The present invention relates to a method for preparing a negative electrode active material, which includes mixing green coke particles, calcined coke particles, and a binder, and graphitizing the mixture through heat treatment to form an artificial graphite particle 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.