Synthesis Of Carbon-based And Tin-based Anode Materials And Their Application In Lithium-ion Batteries

Nowadays the world faces two problems: energy crises and environment pollution, which urgently asks for human to develop and apply new clean energy. In the past two decades, among of many energy conversion devices, Lithium- ion batteries have been applied in commercial production on a large scale owing to their unique advantages, such as high energy density, long service life, environmentally friendly, etc. Meanwhile, the investigation of the crucial parts of Lithium- ion batteries, such as anode/cathode materials, electrolyte etc, has become a focus of scientists. Among them, anode materials play a decisive role on the performance of Lithium- ion batteries. Graphite has been used as anode materials and gained commercialization due to its high Coulombic efficiency and excellent cycling performance. However, the specific capacity of graphite is relatively low（theoretical value: 372 m Ah/g）. As the portable household appliances and electric vehicles are developing rapidly, alternative anode materials are urgently required to enhance the battery performance. In this paper, we synthesize two nanocomposites and investigate their performance as anode materials for Lithium- ion batteries. The main contents are summarized as follows:（1） We synthesized N-doped carbon-encapsulated cobalt nanoparticles on N-doped graphene nanosheets（NC@Co@NG） and investigate its performance as an anode material. The resulting devices display a steadily rising specific capacity. After 300 cycles, from a capacity of 1232.8 m Ah/g was still retained, superior to commercial graphite electrodes. Meanwhile, a good rate performance is observed.（2） We synthesized one dimensional core/shell Ag nanowires@ mesoporous SnO₂ nanocomposites（Ag NWs@SnO₂） and investigate its performance as an anode material, with SnO₂ nanotubes as a comparison. The resulting devices display a capacity of 640.3 m Ah/g, superior to SnO₂ nanotubes electrode（263.6 m Ah/g）. A wonderful rate performance is simultaneously exhibited.