Gao Liu at LBNL has developed a new kind of composite anode based on silicon that can absorb eight times the lithium of current Li-ion batteries and maintains a high capacity of 2100 mAh/g in Si after 650 cycles. The key to such improved cyclability is a tailored polymer with dual functionality: it conducts [...]
Understanding volume change and conductivity in Si nanostructures for Li-ion anodes
Silicon is a promising next-generation anode material for high-energy lithium-ion batteries due to its high specific capacity, which is theoretically 10 times greater than graphite. However, its cycle life is limited due to volume expansion and fracture during lithium reaction. This degradation of the [...]
Real-time Observation of Morphology Changes in SiOx Anodes for Lithium-ion Batteries
The Zaghib Group at Hydro-Québec has used in situ SEM to see SiOx particles grow and shrink during cycling. SiOx is a promising anode material for Li-ion batteries due to a high theoretical specific capacity of 1338 mAh/g and less volume change than Si [...]
Figure 1. Transmission electron microscopy image of a carbon nanotube covered with Si nanoclusters.
Approaches toward Silicon-Based High-Capacity Anodes for Lithium-Ion Batteries
The Kumta Lab is developing low-cost methods for producing nanoscale silicon composites as lithium-ion anodes. These heterostructures comprise nanocrystalline or amorphous Si and may contain a variety of carbon precursors. The [...]