High cycling stability anode of interlayer silicon film with carbon buffer layer on 3D collector

The application scope of silicon-based anode is limited by its poor electrical conductivity and massive volume expansion. Herein, we propose a method to modify electrochemical performance of silicon-based anode with 3D collector and carbon buffer layer by magnetron sputtering. With foam Ni as collector, at a current density of 1 A/g, the first reversible specific capacity reached 1973 mAh/g, and the specific capacity after 100 cycles was1700 mAh/g. With carbon cloth as collector, the first reversible specific capacity was 1543 mAh/g, and the specific capacity after 100 cycles was 1337 mAh/g. The 3D collector was used to buffer the internal stress caused by the bulk effect of silicon. The carbon buffer layer not only improved the material conductivity but also avoided the repeated growth of SEI film, thus providing more buffer space for silicon. This work provides a new promising solution to silicon-based lithium-ion batteries.