Citation: Xianzhun Huang, Yinlin Luo, Bangzhuang Xue, Weiwei Ping, Hongfa Xiang. Constructing highly ion conducting film via 3D composite skeleton for dendrite-free lithium metal batteries[J]. Chinese Chemical Letters, ;2026, 37(10): 111592. doi: 10.1016/j.cclet.2025.111592 shu

Constructing highly ion conducting film via 3D composite skeleton for dendrite-free lithium metal batteries

Department of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

wwping@hfut.edu.cn

hfxiang@hfut.edu.cn

Received Date: 13 May 2025
Revised Date: 6 July 2025
Accepted Date: 15 July 2025
Available Online: 22 July 2025

Figures(4)

Composite solid electrolytes are the most promising candidates for next-generation commercial electrolytes in Li metal batteries. However, the inevitable layered-structure caused by the agglomeration or sedimentation severely impairs the stability and ion conductivity. In this work, by using the phase-inversion within 20 s, we successfully uniformly dispersed Li_6.5La₃Zr_1.5Ta_0.5O₁₂ (LLZTO) nano-powders into cellulose acetate, generating a highly conductive and stable 3D composite skeleton film with the thickness of 50 µm. Due to the high heating/cooling rate of 10⁴ ℃/min, the ultrafast high-temperature sintering (UHS) enables the LLZTO powders with high crystallinity and a size of ~500 nm. Filling the PEGDA polymer, the resulting composite electrolyte films exhibit an ion conductivity of 1.2 mS/cm, nearly 6 times that of the electrolyte film without LLZTO. The composite electrolyte films exhibit excellent stability with Li metal, resulting in a reversible cycling over 2200 h at 0.2 mA/cm². Using LiFePO₄ and Li metal, the full cell shows a high capacity retention of 99.6% after 200 cycles and a high rate performance of 1 C. Pairing with NCM811, the cell stable cycles over 110 cycles with a Coulombic efficiency of 99.2%. This work provides a novel strategy for designing high-performance composite solid electrolytes and paves the way for developing practical SSLMBs with enhanced safety, high energy density, and long cycle life.
- Composite electrolyte films,
- Dendrite-free,
- Phase-inversion,
- 3D skeleton,
- Solid-state li metal batteries
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