A new disruptive technology: a Silicon-Graphene (SiGr) composite anode material

Website | Sectors: Energy Efficiency, Energy Infrastructure, Energy Storage, Smart Grid, and Transportation

Solutions

Low cost LIBs are necessary for the global EV and energy storage products to become truly affordable to the average consumer, business, or utility. The only means to substantially lower LIB cost is via new higher capacity battery materials that greatly improve LIB energy density, cycle life, and faster charge/ discharge characteristics and can be seamlessly implemented.

Graphite has traditionally been the LIB anode of choice for commercial use today. Silicon-based LIB anodes are particularly attractive because of they have the highest theoretical specific capacity of 4,200 mAh/g (ca. Li4.4Si). While silicon alone can absorb lithium better than any battery anode material, it has not shown to be stable and breaks down after only a few charge/discharge cycles. The CalBattery Solution: Use the ANL si-graphene process to stabilize the silicon for extended cycle use in LIBs. When silicon is embedded into graphene nano-platelets using the ANL process, graphenes’ strength and elasticity allows it to absorb the expansion of silicon during battery cycling, making this the first and only commercially viable means of utilizing silicon anodes in most any LIB.

Proof Points

  • Independent tests show an increase in battery energy density and specific capacity over 300%
  • Full cell tests using new high energy cathode and electrolytes coupled with the CalBattery anode achieved an energy density of 525Wh/Kg and specific anode capacity of 1,250mAh/g
  • In comparison to this record breaking performance most of today’s LIBs have an energy density of only 100-200Wh/kg and specific anode (graphite based) capacity of 325mAh/g

Leadership

Phil Roberts

Phil Roberts

Chief Executive Office, Co-Founder
Junbing Yang, Ph. D

Junbing Yang, Ph. D

Inventor, Chief Technology Officer