December 1, 2008

Porous silicon boosts lithium batteries

Make a highly porous material of carbon-covered silicon nanocrystals and you have a key component for better lithium-ion batteries.

The material could replace traditional graphite anodes in lithium batteries. A lithium battery stores electricity by filling its anode with lithium ions. Silicon anodes store more electricity and can be charged and discharged more quickly than graphite anodes, but silicon is too brittle to withstand the repeated charge-discharge cycles needed for practical use.

The porous nanocrystal material has the advantages of silicon and is strong enough for repeated charge-discharge cycles.

Research paper:
Three-Dimensional Porous Silicon Particles for Use in High-Performance Lithium Secondary Batteries
Angewandte Chemie International Edition, published online November 17, 2008

Researchers' homepage:
Nano-Energy Materials Lab, Hanyang University

Back to ERN December 1/8, 2008



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