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- Title
Silane-modified Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> in thermoplastic polyurethane-based polymer electrolyte for all-solid-state lithium battery.
- Authors
Yang, Tingting; Chin, Chi-Te; Cheng, Ching-Hsiang; Zhao, Jinsheng
- Abstract
The ceramic/polymer composite solid electrolyte prepared by a simple physical mixing method has the problem of packing agglomeration and uneven dispersion, resulting in excessive interface impedance, obvious polarization, and severe reduction in energy density of solid-state batteries eventually. Given this defect, a silane coupling agent (KH560) containing Si–O bonds with low rotational potential energy was introduced to modify the garnet-type solid electrolyte (Li6.4La3Zr1.4Ta0.6O12, LLZTO) and then a ceramic polymer composite particle (Si@LLZTO) was achieved, which could be distributed uniformly in a thermoplastic polyurethane (TPU) matrix. Besides, a reduction in the crystallinity of TPU was evoked by the great interfacial compatibility of the silane-modified inorganic fillers, thus the composite solid electrolyte (TPU-Si@LLZTO) exhibits higher ionic conductivity (2.9 × 10−4 S cm−1), a wider electrochemical window (5 V, vs. Li/Li+), and a higher ion transfer number (tLi+ = 0.40). Furthermore, TPU-Si@LLZTO electrolyte displayed long running stability over 1000 h, and excellent rate performance in all-solid-state batteries with the positive electrode of LiFePO4. In conclusion, functional silanes exhibited a positive effect in constructing a compatible solid–solid interface between inorganic fillers/polyurethane polymers and gave full play to the performance advantages of composite electrolytes.
- Subjects
POLYELECTROLYTES; SOLID state batteries; LITHIUM cells; SOLID electrolytes; SILANE coupling agents; POTENTIAL energy; SOLID-solid interfaces
- Publication
Journal of Solid State Electrochemistry, 2023, Vol 27, Issue 9, p2509
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-023-05535-5