A facile route to suppress the capacity fading because of the pulverization and uncontrolled growth of solid electrolyte interphase in silicon anodes is described. In this new approach, a mixture consisting of milled silicon particles and superconducting carbon particles is dispersed with a liquid precursor of carbon (Furfuryl alcohol). Silicon particles milled and coated with carbon using this simple approach showed a reversible capacity of 1050 mAh/g after 200 cycles. Impedance spectroscopy is used to identify the roles of different sources of impedance on the overall electrode performance. This anode also displayed a specific capacity of ~750 mAh/g even at a higher current density of 6 A/g, The same electrode is tested at various higher temperatures up to 60°C and maintained good performance without any safety issues. Furthermore, this anode is tested in a full cell against a LiNi0.5Co0.2Mn0.3O2 cathode and displayed a stable reversible capacity of ~76 mAh/g after 100 cycles. Therefore, a new approach of preparing silicon-based anodes for next generation Li-ion batteries with superior capacity and performance is presented.
This method of producing a Si-based anode for Li-ion batteries results in a stable, robust system that is capable of higher energy densities and higher efficiencies, even at high temperatures and for multiple cycles.
High capacity energy storage and efficient release for transportation, energy storage for renewable energy such as wind and solar.
Si-based anode, produced with this method, has a specific capacity of 750 mAh/g at current density of 6 A/g
Si-based anode, produced with this method, performs well a up to 60 degrees C
When tested in a full cell, the Si-based anode displayed stable reversible capacity of 76mAh/g after 100 cycles