Journal
SOLID STATE IONICS
Volume 355, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2020.115419
Keywords
Composite solid state electrolytes (SSEs); Dual-matrix; Fast ion conductor Li1.4Al0.4Ti1.6(PO4)(3)(LATP); Ionic conductivity; All-solid-state batteries
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Funding
- National Natural Science Foundation of China (NSFC) [51672069, 50902044]
- Zhongyuan Thousand Talents Program of Henan Province [ZYQR201912155]
- Program for Innovative Research Team in Science and Technology in the University of Henan Province (IRTSTHN) [20IRTSTHN012]
- Foundation of Henan Educational Committee [18A140001]
- Science and Technology Development Project of Henan Province [202102210105, 192102210235]
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Organic-inorganic composite solid state electrolytes (SSEs), as one of the most attractive candidates for next generation SSEs, combines the both advantages of flexibility (from organic polymer) and structure rigidity (from robust inorganic constituent). In this work, a high performance three-dimensional (3D) crosslinked electrolyte with polymer poly(vinylidene fluoride) (PVDF) and polyethylene oxide (PEO) matrices is further modified by dispersing submicron fast ion conductor Li1.4Al0.4Ti1.6(PO4)(3) (LATP). The optimal 3D composite SSE PVDF@10PEO-5LATP-5LiPF6 (PPLL) shows high ionic conductivities of 5.24 x 10(-4) S cm(-1) at 25 degrees C and above 10(-3) S cm(-1) at 50 degrees C. Galvanostatic cycling test demonstrates that PPLL contributes to electrochemical performances, with high capacity retention of 93.95% after 500 cycles for LiFePO4 cathode. Further investigations indicate its more benefits including excellent flexibility and superior safety. Intensive explorations imply that the interaction between dual-matrix degrades the respective crystallization through generating weak bonding, and the recombination with LATP further enhances ionic conductivity as well as structural stability of composite electrolyte via strengthening interface reaction, and reducing the organic crystallinity. This composite SSE with high conductivity and stability may be applied in next generation energy storage devices, particularly in all-solid-state secondary batteries.
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