Amphiphilic carbonaceous material modified graphite as anode material for lithium-ion batteries

Artificial graphite powder was coated by amphiphilic carbonaceous material (ACM) in aqueous solutions. SEM and XRD results show that the surface defects and edge sites of original graphite are uniformly covered by the ACM coating layer after modification. The overall characteristics of graphite, however, are not severely changed. Electrochemical measurements were then carried out to evaluate the anode performances of samples in lithium-ion batteries. The modified graphite shows an initial efficiency up to 90.6% and discharge capacitance of 366.4 mAhg(-1). Meanwhile, its capacitance remains as high as 350 mAhr(-1) after 30 cycles charge/discharge tests, evincing good cyclic performance. Compared with conventional methods, the abovementioned non-organic solvent coating presents an economic, facile, and green pathway for graphite mass utilisation as an alternative anode material in lithium-ion batteries. (C) 2010 Elsevier B.V. All rights reserved.