Facile solid-state synthesis of Li_2MnSiO_4/C nanocomposite as a superior cathode with a long cycle life

摘要

The Li_2MnSiO_4/C nanocomposite has been successfully synthesized at a relatively low temperature of 650 ℃ by a facile solid-state reaction using citric acid as the carbon source. The highly crystalline Li_2MnSiO_4 nanoparticles in the size of 20-50 nm are coated by a uniform carbon layer in a thickness of 2-5 nm. At a rate of 0.05 C, the Li_2MnSiO_4/C nanocomposite exhibits a discharge specific capacity as high as 268 mAh g~(-1) for the first cycle and a reversible capacity of about 136 mAh g~(-1) after 140 cycles at room temperature. Meanwhile, an improved rate performance is achieved by the Li_2MnSiO_4/C nanocomposite. These superior electrochemical properties could be attributed to the nanoscale particle size and the enhanced electronic conductivity.