Using SiO Anodes for High Capacity, High Rate Electrodes for Lithium Ion Batteries
Berkeley Lab developed an elegant and inexpensive fabrication method for high performance electrodes with unmatched specific / areal capacities and good capacity retention for application in lithium ion batteries.Description
A team of Berkeley Lab researchers led by Gao Liu have developed an elegant and inexpensive fabrication method for high performance electrodes with unmatched specific / areal capacities and good capacity retention for application in lithium ion batteries.
The Berkeley Lab process uses porous silicon oxide (SiO) anodes enabled by a conductive polymer binder and enhanced by Stabilized Lithium Metal Powder (SLMP®). The conductive polymer binder enables porosity in SiO, which buffers the volume change of Si in lithiation and delithiation and maintains the mechanical / electrical integrity of the electrode, improving the areal capacity to an impressive ~3.3 mAh/cm2. The binding polymer used also eliminates the need for a conductive additive and increases the cycling stability of Si. SiO is prelithiatied with SLMP® to further enhance the stability and performance of the electrode. The resulting SiO anode has a proven outstanding specific capacity >1000 mAh/g and a 90% capacity retention for ~500 cycles. At C/3 in a lithium ion fuel cell the electrode showed a >80% capacity retention.
Silicon’s high theoretical specific capacity and natural abundance makes it a great material for the development of high-capacity anode materials. However, there has been no widespread application due to the large costs associated with producing a stable Si based electrode. This Berkeley Lab technology provides an inexpensive and scalable method of producing electrodes for commercialization with unmatched performance.Benefits
- Elegant, inexpensive and scalable process
- High specific capacity ( >1000 mAh/g )
- High capacity retention ( 90% )
- High areal capacity ( >3 mAh/cm2 )
Lithium ion batteries for electric vehiclesTechnology Status
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