This technology involves transferring and coating a polymer thin film, such as PDMS, onto the surface of a porous copper current collector. It prevents excessive lithium deposition on the electrode surface during charge/discharge cycles of lithium metal batteries and induces lithium infiltration into internal pores, thereby suppressing dendrite growth.
Even when porous structures are used as anodes in lithium metal batteries, lithium often fails to penetrate the pores and instead deposits on the surface, leading to dendrite formation. This results in electrode volume expansion, short circuits, fire hazards, and performance degradation.
This technology forms a polymer/curing agent thin film on a substrate via spin coating at 1600–8000 RPM, cures it for 24–90 hours, and transfers it to a porous current collector at a pressure of 0.5–50.0 g/cm² to control the surface and induce uniform lithium deposition. It can be applied to lithium metal batteries using 3D copper foam or mesh as anode hosts and to anode-free cell development, allowing full utilization of internal pore space for lithium storage while reducing the risk of short circuits and fires.
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