Silicon anode supported by carbon scaffold for high performance lithium ion micro-battery

We have developed a novel silicon/void/carbon anode for lithium ion batteries, with high specific capacity (2200 mAh/g in initial cycle) and superior cyclability (1200 mAh/g after 80 cycles). The high capacity is enabled by the sufficient silicon nanoparticles (SiNPs) at anode. And long cycle life is ensured by the nano void space between SiNPs and carbon scaffold, providing enough space for expansion and contraction of SiNPs during the process of lithium ion intercalation and deintercalation. By using templating method from photoresist (SU-8) with nanoparticles, it´s possible to implement direct prototyping of three dimensional (3D) micro-battery on chip.