Introduction to Metal – Inorganic Non – metal Composite Negative Electrode Materials, Metal Oxide and Other Lithium Ion Battery Negative Materials:
1> Metal – inorganic non-metallic composite negative electrode
Metal – inorganic non-metallic composite negative electrode shake mainly includes metal-carbon complexes and gold-silicon complexes. These materials are significantly better than corresponding single-phase materials in an in-element capacity, electrode conductivity, and magnification. Composition of metal and carbon can make the material and the high capacity of the metal and excellent cycle properties of the carbon material. Composite materials such as metal and carbon nanotubes can not only increase the embedded and de-lithium capacity of the material. It is also possible to improve the cycle performance of the electrode during charging and discharging during charging and carbon nanotubes. The metal-silicon composite material has high inconed lithium capacity, but the cycle performance is poor.
Oxides mainly include an oxide of Sn and some 3D transition metals. Its embed lithium process is divided into the following steps:
MXOY + 2YLI —— XM + YLI2O
XM + YL —— MXLIY
The first step, lithium and metal oxide reactively produce metallic monomi and LiO2; second step, metal monomi continued to form alloys. Although the generation of LIO causes huge irreversible capacity loss, it also acts as a buffer, reducing the volume change in the charge and discharge process, and the advantages of such materials are high, and the magnification charge and discharge is good, such as After the SN02 embedded lithium, Li4.4SN high-rich lithium alloy can be formed, the theoretical capacity of 990 mA. H / g, additional, CO3O4, COO, NiO, TiO2, Fe2O3 are all studied more metal oxide negative materials, but due to the first irreversible capacity High, charge and discharge potential platform is unstable and significant capacity recession, which is not optimistic in the application prospects of the lithium-ion battery.
3>Other negative electrode materials
Fett, sulfides, nitrides, and the like are also used as the negative electrode material of the lithium ion battery. Terattate is generally a spine-type structure, such as the highest discharge capacity of spinel COFE2O2 reaches 910 mA.H / g, and the magnification charge and discharge performance is excellent. The NIFE2 O2 film maintains the reversible capacity of 600 mA .h / g in 100 cycles. Metal sulfides such as WS2, etc., in the 1970s, was used as lithium ion battery in lithium negative electrode materials. The study of nitride was mainly derived from the high ionic conductivity of Li3 N, Li3 N and transition metal elements Cu, Co, Ni, and Fe, which obtained Li-mxn of the layered structure, such compound electrically conductive properties, used as lithium ions The magnification charge and discharge performance during the battery negative electrode material is excellent, but the cycle performance is poor.
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