Modification of graphite anode for lithium ion battery

Abstract

Traditional fossil energy is being replaced by low-carbon clean energy, and lithium batteries have obtained extensive attention and are widely used for their high energy density and power density. Graphite is the most commonly used anode material for its excellent electrochemical performance. Since the theoretical lithium storage capacity of graphite is only 372 mAh/g, the lithium battery with graphite anode has problems such as poor electrolyte compatibility and a high volume expansion rate. Many researchers have devoted themselves to the modification of graphite anode to improve the comprehensive performance of graphite anode materials. This paper focuses on three main modification methods of graphite anodes. The application research progress of graphite modification on the improvement of lithium batteries performance was summarized from the aspects of spheroidization treatment, surface coating, and element doping. Spheroidization treatment and surface coating can effectively improve the electrochemical properties of the material interface, but it is difficult to increase the energy density of the material interface. Doping modification can improve energy density, but it cannot be uniform and stable. The modification and improvement technology of graphite anode still needs to be developed.