Lithium-ion power battery material

Abstract

The invention aims at providing a lithium-ion power battery material. Spinel lithium titanate is adopted as a negative electrode; and the lithium-ion power battery material is high in discharge speed, good in overcharge resistance, excellent in heat stability and excellent in safety. A positive electrode of the lithium-ion power battery material comprises a main material, namely a lithium iron phosphate and lithium vanadium phosphate composite material; a positive electrode material and a negative electrode material can be used cooperatively; and the lithium-ion power battery material has the advantages of high current charge-discharge capability, extremely high safety and excellent circulating discharge performance, and is suitable for the field of electric automobiles.

Description

Background technique [0001] At present, most commercial lithium-ion battery anode materials are lithium-intercalated carbon materials. Since the potential of the carbon electrode after lithium intercalation is very close to that of metal lithium, when the battery is overcharged, metal lithium is easily precipitated on the surface of the carbon electrode, and it interacts with the electrolyte. The reaction produces a flammable gas mixture, thus causing a great safety hazard to the battery, especially the power battery. At the same time, the graphite electrode also has the problem of co-intercalation of the electrolyte, which will also affect the cycle stability of the electrode. Therefore, it is necessary to find new anode materials that can intercalate lithium at a slightly positive potential than carbon anodes, are cheap, easy to obtain, safe and reliable. Among them, low-potential transition metal oxides and composite oxides have attracted widespread attention as negative e...

AI Technical Summary

Problems solved by technology

[0001] At present, most commercial lithium-ion battery anode materials are lithium-intercalated carbon materials. Since the potential of the carbon electrode after lithium intercalation is very close to that of metal lithium, when the battery is overcharged, metal lithium is easily precipitated on the surface of the carbon electrode, and it interacts with the electrolyte. The reaction produces a flammable gas mixture, which poses a great safety hazard to batteries, especially power batteries

At the same time, graphite electrodes also have the problem of co-intercalation of the electrolyte, which will also affect the cycle stability of the electrode.