07 April 2013

Silicon and Carbon Composite Material In Lithium Ion Batteries for High Capacity and Long Cycle Life

Pacific Northwest National Laboratory reports on its study on the use of composite silicon and carbon materials as anodes for high capacity and long cycle lithium ion batteries. This research was presented at a meeting of the American Chemical Society as part of the 245th National Meeting & Exposition of the American Chemical Society.

Abstract: Fundamental microstructural designing concepts for high capacity and long cycle life of anode materials based on carbon and silicon for lithium ion battery

Chongmin Wang, Pacific Northwest National Laboratory
Phone: 509-371-6268
Email: Chongmin.wang@pnnl.gov

For lithium ion battery, a range of materials has a high theoretical capacity, while in reality, this type of materials cannot be used directly due to a fast capacity fading. It is believed that the capacity fading and short cycle life of the battery using this type of materials are directly related to the overall large volume expansion and anisotropic accommodation of the volume change. Carbon is a commonly used conductor additive in the lithium electrode materials and it has a range of tailorable structures, ranging from nanofiber, graphene, and particles. Therefore, it is a natural approach to rationally design a composite materials based on Si and carbon. Due to their nanoscale dimensions, the lithiation induced volume expansion and shape change can be accommodated, therefore, reducing the chance of the failure of the battery. In this presentation, we review some of the fundamental designing concepts and associated challenges for tailoring composite materials based on Si and carbon as anode materials with high capacity and long cycle life.


Pacific Northwest National Laboratory
American Chemical Society