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Ultrathin Polymer Composite Electrolyte With Dual‐Scale Reinforcement: Integrating PTFE Framework and In Situ Silica.

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Title: Ultrathin Polymer Composite Electrolyte With Dual‐Scale Reinforcement: Integrating PTFE Framework and In Situ Silica.
Authors: Wang, Dehua1,2 (AUTHOR), Zhang, Yifan2 (AUTHOR), Tang, Junyan2 (AUTHOR), Huang, Jiming3 (AUTHOR), Chen, Xiaoli1 (AUTHOR) xlchen@whpu.edu.cn, Tang, Mi2 (AUTHOR), Wang, Zhengbang2,3 (AUTHOR) zhengbang.wang@hubu.edu.cn
Source: Polymer Engineering & Science. Apr2026, Vol. 66 Issue 4, p2901-2909. 9p.
Subjects: Polytef, Silica nanoparticles, Polymeric membranes, Strengthening mechanisms in solids, Energy storage, Solid state batteries, Ionic conductivity, Composite membranes (Chemistry)
Abstract: Developing ultrathin yet mechanically robust polymer electrolytes remain a key challenge for enabling practical solid‐state lithium batteries. Here, we report a scalable engineering strategy to construct an ultrathin (~19 μm) composite polymer electrolyte (PPLS) by integrating a macroporous polytetrafluoroethylene (PTFE) scaffold with an in situ formed silica (SiO2) nanonetwork within a poly(ethylene oxide) (PEO) matrix. The PTFE framework provides macroscopic dimensional stability and mechanical reinforcement, while the SiO2 network, generated via a controlled in situ hydrolysis process, effectively reduces polymer crystallinity and enhances ionic transport. The resulting PPLS membrane exhibits a tensile strength of approximately 75 MPa, an ionic conductivity of 1.6 × 10−4 S cm−1 at 60°C, and a Li+ transference number of 0.60. This electrolyte enables stable L//Li cycling for more than 700 h and demonstrates excellent rate capability in both LiFePO4 and NCM523 full cells. The hierarchical PTFE/SiO2 architecture exemplifies how rational multi‐scale design can simultaneously achieve structural robustness and efficient ionic mobility, providing a promising and scalable pathway for the development of high‐performance polymer composites for energy storage applications. Summary: Hierarchical dual‐scale reinforcement via PTFE scaffold and SiO2 network.Freestanding ultrathin (~19 μm) membrane with ~75 MPa strength.Reduced crystallinity promotes efficient Li+ transport.Stable Li cycling for over 700 h with low polarization.Scalable in situ processing route for polymer composite fabrication. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Developing ultrathin yet mechanically robust polymer electrolytes remain a key challenge for enabling practical solid‐state lithium batteries. Here, we report a scalable engineering strategy to construct an ultrathin (~19 μm) composite polymer electrolyte (PPLS) by integrating a macroporous polytetrafluoroethylene (PTFE) scaffold with an in situ formed silica (SiO2) nanonetwork within a poly(ethylene oxide) (PEO) matrix. The PTFE framework provides macroscopic dimensional stability and mechanical reinforcement, while the SiO2 network, generated via a controlled in situ hydrolysis process, effectively reduces polymer crystallinity and enhances ionic transport. The resulting PPLS membrane exhibits a tensile strength of approximately 75 MPa, an ionic conductivity of 1.6 × 10−4 S cm−1 at 60°C, and a Li+ transference number of 0.60. This electrolyte enables stable L//Li cycling for more than 700 h and demonstrates excellent rate capability in both LiFePO4 and NCM523 full cells. The hierarchical PTFE/SiO2 architecture exemplifies how rational multi‐scale design can simultaneously achieve structural robustness and efficient ionic mobility, providing a promising and scalable pathway for the development of high‐performance polymer composites for energy storage applications. Summary: Hierarchical dual‐scale reinforcement via PTFE scaffold and SiO2 network.Freestanding ultrathin (~19 μm) membrane with ~75 MPa strength.Reduced crystallinity promotes efficient Li+ transport.Stable Li cycling for over 700 h with low polarization.Scalable in situ processing route for polymer composite fabrication. [ABSTRACT FROM AUTHOR]
ISSN:00323888
DOI:10.1002/pen.70404