Excellent performance of a modified graphite anode for lithium-ion battery application

Abstract

Electrochemical performance of a potential fast-charging graphite material in lithium-ion batteries prepared by the modification of natural flake graphite (FG-1) is investigated. FG-1 displays excellent electrochemical performance than most of the modified NFG materials. Galvanostatic cycling tests performed in half cells give the initial capacity of 382.7/361.1 mAh g−1, delivering a small irreversible capacity (21.6 mAh g−1) and high coulombic efficiency (94.4%). The carbon-coated graphite displays superior rate performance at 2 C and 3 C currents in pouch cells. FG-1 can cycle at ambient temperature for 500 times under 2 C/1 C and 3 C/1 C regimes with capacity retention of 90.24% and 86.83%, respectively. Moreover, 86.93% and 86.65% of capacity are retained after 800 cycles at 45 °C under the same currents. Storage at elevated temperature (60 °C) after 21 days leads to only 2.98% of voltage drop, as well as 75.72% and 86.43% of capacity retention and recovery.