2010-823 Lithium Ion Batteries Based On Nanoporous Silicon

SUMMARY

Researchers at UCLA have developed a novel three-dimensional porous silicon Lithium ion (Li+) micro-battery that demonstrates high power density and extended cycling life, offering a low space and light weight alternate to standard rechargeable batteries

BACKGROUND

As the popularity for portable electronics increases, the performance of small-scale secondary batteries is even more critical. New generation Li+ batteries are being investigated in order to obtain higher power capacity and extended cycling life.

INNOVATION

Researchers at UCLA have formed novel Li+ secondary battery electrodes that demonstrate high power capacity and retention of structure through many charge/discharge cycles. The conventional graphite electrode is replaced with a porous film of silicon nanowires, with a structure that is controllable during the alloying/dealloying process eliminating its associated volume changes. Furthermore, because the porous nanowires are made by etching of Si wafers, this technology also has the potential to be integrated with other lithographically produced devices.

POTENTIAL APPLICATIONS

• Portable electronics
• MEMS, mobile phones, music players, notebooks, sensors

ADVANTAGES

• Low cost and simple fabrication
• Compatible with standard lithography techniques
• High power capacity and extended cycling life