This PDF file includes:

• fig. S1. Fabrication of the 3D porous Li-rGO composite anode.
  
• fig. S2. SEM images of the bulk CPE.
  
• fig. S3. Ionic conductivities at different temperatures and photo images of PEGLiTFSI with varying EO/Li ratios.
  
• fig. S4. Rheological properties of flowable PEG.
  
• fig. S5. Porosity of the 3D porous Li-rGO anode.
  
• fig. S6. Specific capacity of the 3D porous Li-rGO anode.
  
• fig. S7. Cross-sectional SEM images of the 3D porous Li-rGO anode with different thickness.
  
• fig. S8. Comparison of the exchange currents of Li foil and Li-rGO.
  
• fig. S9. FIB/SEM images of Li foil and 3D Li-rGO electrode after cycling.
  
• fig. S10. The effect of flowable interphase.
  
• fig. S11. The effect of high–surface area Li.
  
• fig. S12. Electrochemical impedance study.
  
• fig. S13. Symmetric cell voltage profiles at 80°C.
  
• fig. S14. Cycling stability of symmetric cells at 80°C.
  
• fig. S15. Voltage profiles of Li-LFP full cells after cycling.
  
• fig. S16. Cycling stability of Li-LFP cells at 80°C.
  
• fig. S17. Coulombic efficiency of Li-LFP cells.
  
• fig. S18. The electrochemical performance of Li-LFP full cells at 40°C.
  
• fig. S19. The electrochemical performance of symmetric cells with PEGDA middle layer at room temperature.
  
• fig. S20. Characterizations on the LLZTO membranes.
  
• table S1. Comparison of the electrochemical performance of our solid-state Li battery using 3D Li with flowable interphase with those reported in the literature using the Li foil anode.
  
• References (44–51)

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