Lithium- gel polymer electrolyte composite anode with large electrolyte-lithium interface for solid-state battery

Solid-state lithium metal battery have great advantages in energy density and safety, but their interface problems limit the rate performance and cycle performance, leaving it still far from practical. Here, aiming at the problems of the interface, we prepared a Lithium-gel polymer electrolyte (Li-GPE) composite anode by coiling and cutting the Stacked Gel polymer electrolyte film and lithium foil. The Li-GPE composite anode has a lithium-GPE vertical alternating array structure and this structure can provide a continuous lithium ion transmission channel when the volume changes caused by lithium stripping or plating. In addition, the structure has a large lithium-electrolyte interface, which can reduce local current density and interface resistance when current passes through the anode, and making the stripping and plating of lithium more uniform. Electrochemical tests show that the LG composite anode has excellent rate performance and large capacity cycling performance. LG composite anode can be cycled stably for 800 cycles at a large capacity of 5mAh cm−2, and the assembled LG-LFP solid-state full cell can cycle stably for more than 800 times at a high rate of 5 C. LG composite anode with large interface provides a new approach for the practical application of solid-state lithium battery.