Speaker
Description
To keep pace with the ever-increasing demands for high energy density, low cost, and long cycle life of rechargeable batteries, advanced battery designs are needed. The greatest improvement over conventional batteries is expected to come from the use of metallic lithium as an anode. However, non-uniform electroplating of lithium metal results in the formation of dendrites, which greatly shortens battery life.
Researchers from Samsung have recently shown that introducing an amorphous interlayer of Ag-C composite leads to long term stability without dendrite formation.[1] However, the reason why the interlayer shows this advantageous behavior is not understood. We deposit amorphous carbon interlayers with different properties between the current collector and solid-state electrolyte by direct current and high power impulse magnetron sputtering. We show the influence of the microstructure and conductivity of the carbon interlayer on lithium plating through lithium phosphorus oxynitride (LiPON). We find that both the overpotential for lithium plating and the initial lithium loss due to interphase formation strongly depend on the carbon deposition temperature. Finally, we show how the carbon interlayer affects the cycle life of an anode-free thin-film solid-state battery. Our results shed light on the key factors that enable homogeneous lithium plating and thus the use of lithium metal in solid-state batteries.
References
[1] Y.-G. Lee et al. High-energy long-cycling all-solid-state lithium metal batteries enabled by silver–carbon composite anodes. Nat. Energy 5, 299–308 (2020)
| Speaker Country | Switzerland |
|---|