Since the inception of lithium-ion battery, anode material related research mainly in the following categories: carbon materials, graphite, amorphous carbon materials, nitride, silicon-based materials, tin-based materials, new alloys, nano-oxides and other materials. As anode material for lithium ion batteries have the following performance requirements:

① lithium ion insertion anode matrix redox potential as low as possible, close to the lithium metal potential, so that the battery output voltage Gao;

② in the matrix a large number of reversible lithium insertion and removal can be inserted to get a high capacity density, can reverse the X value is as large as possible;,

③ In the Insert / off insertion process, Tecra M5 battery insertion of lithium insertion and removal should be reversible and little or no principal structure change, so to ensure a good cycle performance;

④ redox potential changes with X should be as little as possible, so that the battery voltage does not significant change, and can keep stable charge and discharge;

⑤ Insert the compound should be better electronic conductivity and ionic conductivity, this reduces the polarization and to conduct high current charge and discharge;

⑥ the main material with good surface structure, the ability of liquid electrolyte to form a good SEI film;

⑦ insertion compounds in the entire voltage range has good chemical stability, after the formation of SEI film does not react with the electrolyte;

⑧ in the main materials of lithium ion diffusion coefficient of a larger, easy to quickly charge and discharge;

⑨ from a practical point of view, Apple A1280 battery the main material should be inexpensive, such as environmental pollution.

2.2 The choice of cathode material requirements

Lithium-ion battery cathode material is usually embedded as an ideal compound