Preparation and Characterization of Graphite Anod efor Lithium Ion Batteries

R. M. HUMANA; M. G. ORTIZ; J.E. THOMAS; S. G. REAL; A. VISINTIN

Brno

Congreso; 15th ABAF; 2014

The lithium-ion batteries are energy storage systems of high performance andlow cost for use in multiple portable devices. These require the use ofincreasingly smaller and lighter batteries with high energy and power density,fast charging and long service life. Moreover, these systems are promisingfor use in electric or hybrid vehicles. However, the successful use of thelithium in the field, requires improvements in relation to the properties ofelectrode materials, such as cost, energy density, cycle life, safety, andenvironmental compatibility. Currently, investigations are looking to improvethe cell configuration by careful selection of the materials and componentselectrolytic1. These batteries use carbon as anode material, usually syntheticgraphite, because of its high coulombic efficiency and acceptable specificcapacity for the formation of intercalation compounds (LiC6) 2. Their lowvoltage increases the potential difference between the electrodes andtherefore the energy density of the battery 3, 4. In this paper, we present themethodology used to prepare and characterize the reversible and irreversiblecapacity and cyclic stability of graphite materials as anodes in lithium-ionbatteries of commercial carbon (CR 1296) and Sungite carbon. We discussthe results obtained using electrochemical techniques for charging anddischarging at different current densities, cyclic voltammetry andelectrochemical impedance spectroscopy (EIS). Some of these results arepresented in Figures 1 and 2.