Skinny free-standing composite strong electrolyte movie for solid-state lithium steel battery


Researchers at Beijing College of Know-how have developed a skinny free-standing composite strong electrolyte (CSE) movie for solid-state lithium steel batteries. The movie affords excessive ionic conductivity (2.76×10-4 S/cm at 25 °C) and vast electrochemical stability window (4.8 V vs. Li+/Li).

In an open-access paper revealed within the RSC journal Chemical Communications, the researchers report that CSE-based solid-state lithium steel batteries with LiCoO2 cathode current good cycle stability and capability retention with 4.5 V cut-off voltage.


Fabrication and characterization of the skinny PL movie. (a) Schematic diagram of preparation and optical picture of PL movie. (b) AFM and (c) the cross-section SEM photos of PL movie. Wang et al.

… the vitality density of SSLMBs [solid-state lithium metal batteries] is inversely proportional to the thickness and mass of SSEs [solid-state electrolytes]. It has been estimated that the gravimetric vitality density of 400 Wh/kg could be achieved with the thickness of 20-30 µm for SSEs. Nonetheless, the mechanical energy of skinny SSE movie can be poor and can’t eradicate the chance of Li dendrite penetration after lengthy biking, which trigger the security difficulty of SSLMBs. Furthermore, when the thickness of SSE is diminished, the Li ions diffusion time and distance could be diminished drastically, after which the electrochemical performances of SSLMBs could be enhanced at excessive present density. For the CSE, it’s important to acquire the skinny electrolyte movie with excessive ionic conductivity and vast electrochemical stability window, and to boost the vitality density and electrochemical performances of SSLMBs. Though the PI/PVDF-HFP/LLZTO, PTFE/PVDF-HFP/ dual-salt PE, cellulose nanofibril/LLZO/PEO, separator community/PEO, and vermiculite/PEO/PAN/LiTFSI CSE movie have been reported, the efficient methodology for facile manufacturing of skinny free-standing electrolyte movie (

Right here, a collection of skinny free-standing CSE movies with the thickness of ~15 &mico;lm are ready by tape casting and resolution infusion methodology, through which the ionic conductivity and electrochemical stability window could be promoted to 2.76×10-4 S/cm at 25 °C and 4.8 V (vs. Li+/Li), respectively. Moreover, the favorable interface stability of CSE movie with Li steel could be achieved. Primarily based on this CSE movie, the SSLMBs present wonderful electrochemical efficiency with excessive voltage cathode materials.

—Wang et al.


  • Yongtao Wang, Lingqiao Wu, Xianwei Guo, Peipei Ding, Zhiyuan Lin, Yinzhong Wang, Xin Yin and Haijun Yu (2022) “A Skinny Free-standing Composite Stable Electrolyte Movie for Stable-State Lithium Steel Battery” Chem. Commun. doi: 10.1039/D2CC02203F


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