SiO2@graphite Composite Generated from Sewage Sludge as Anode Material for Lithium Ion Batteries

Sewage sludge treatment is an annoying issue due to the environmental pollution. We herein demonstrate the effective conversion of sewage sludge to a potential anode material for lithium ion batteries (LIBs) by a simple annealing method combined mechanical milling. The generated silica (SiO2) hybridized with a handful of graphite exhibits good electrochemical performance. Stable reversible capacity of 433 mAh g(-1) is achieved after 100 cycles at 100 mA g(-1) At a high current density of 1000 mA g(-1), the reversible capacity is still stabilizing at 244 mAh g(-1) after 500 cycles, demonstrating the waste sewage sludge is a potential LIBs anode source.