Silicon anode of lithium ion battery

Abstract

The invention discloses a silicon anode of a lithium ion battery. The silicon anode is formed by bonding a conductive agent and an anode material, the anode material comprises anode active matter and a binding material, the anode active matter comprises graphite and silicon dioxide, and the binding material is an organic solvent type binding agent. A conductive agent is of a silicon nanotube ball structure and comprises a plurality of evenly distributed silicon nanotubes, and the anode material is attached to the surfaces of the silicon nanotubes. A carbon material has high electronic conductivity and ionic conductivity, the rate capacity of the silicon material can be improved, and the volume effect of silicone in the circulating process can be inhibited. The silicon anode has high battery capacity and circulating stability.

Description

technical field [0001] The invention relates to a silicon negative pole of a lithium ion battery. Background technique [0002] Lithium-ion batteries are used in a wide range of fields, including electronic terminal equipment such as mobile phones and laptop computers, and even to the fields of electric vehicles and energy storage technology; lithium-ion batteries are structurally divided into positive electrodes, negative electrodes, diaphragms, electrolytes, and shells. Wherein, the anode material generally includes an anode active material, a conductive agent and a binder. [0003] The traditional negative electrode active material is generally graphite, but the capacity of the lithium-ion battery made of it is limited, which limits the development of lithium-ion batteries; compared with the traditional graphite negative electrode, silicon has an ultra-high theoretical specific capacity (4200 mAh / g) and Low delithiation potential (<0.5 V), and the voltage platform of ...

AI Technical Summary

Problems solved by technology

[0003] The traditional negative electrode active material is generally graphite, but the capacity of the lithium-ion battery made of it is limited, which limits the development of lithium-ion batteries; compared with the traditional graphite negative electrode, silicon has an ultra-high theoretical specific capacity (4200 mAh / g) and Lower delithiation potential (<0.5 V), and the voltage platform of silicon is slightly higher than that of graphite, it is difficult to cause lithium precipitation on the surface during charging, and the safety performance is better