Prospects of application of the activated hydrolised lignin as cathode material for lithium batteries
Keywords:
hydrolised lignin, organic electrode material, lithium batteries, fluorinated lignin, XPSAbstract
The possibility of using a nanographitized form of hydrolised lignin obtained as a result of its thermal activation, as well as fluorinated derivatives as cathode material for lithium power source is estimated. The results of galvanostatic discharge of electrochemical systems demonstrate the practical significance of lignin activation by pyrolysis at 1000 °C under high vacuum conditions. In particular, in the voltage range 0.5–3.0 V, the specific capacity of lignin and its thermal activation product is 190 and 845 mA·h/g, respectively. The improvement in the characteristics of a lithium cell based on a thermally activated derivative is apparently due to graphitization, an increase in the electrical conductivity, and, probably, participation of sorbed oxygen in cell reaction. Using fluorinated forms of both lignin and the product of its thermal activation, lithium cells show increased values of the operating voltage, which is determined by the participation of fluorine bonded to carbon in the current-producing process.
