Capacitor

Abstract

The invention discloses a capacitor. The capacitor comprises a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte is arranged between the positive electrode and the negative electrode, the positive electrode comprises a positive electrode material, the positive electrode material comprises a positive active material and an additive, the constituent formula of the additive is Li<X>M<Y>Mn<1-Y>O<z>, x, y and z express atom% value, 0.92<=x<=0.98, 0.83<=y<=0.88, 1.6<=z<=2, the negative electrode comprises a negative electrode material, the negative electrode material comprises a negative active material, the constituent formula of the negative active material is SiSnNi<c>C<d>, a, b, c and d express atom% value, 25<=a<=35, 6<=b<=10, 3<=c<=5, and 1.6<=d<=2. The capacitor has the advantages of favorable performance in positive electrode material and negative electrode material, safety, reliability and relatively high specific energy.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to a capacitor. Background technique [0002] With the rapid emergence and development of new technologies in the fields of information technology, electronic products, and vehicle energy, people pay more attention to the research and development of novel supercapacitors. A supercapacitor is a capacitor developed in recent years that can store electrical energy in a large capacity and has high-power discharge characteristics. It is a new type of energy storage device between capacitors and batteries. Different from traditional capacitors, supercapacitors store charges through the interface between electrodes and electrolyte or reversible redox reactions on the surface or inside of electrodes. Because of this, supercapacitors can be repeatedly charged and discharged hundreds of thousands of times. [0003] In positive electrode materials, lithium is added to the active material, an...

AI Technical Summary

Problems solved by technology

The ductility of the metal can suppress the volume effect of the silicon material to a certain extent and improve the cycle performance, but the silicon structural defects generated during the preparation process have high electrochemical activity, which will lead to an increase in the irreversible capacity

Compared with batteries, supercapacitors have the disadvantage of low specific energy, which affects their application in fields requiring high energy density, such as new energy vehicles, energy recovery, and new energy storage.

Images