Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 45, Pages 42206-42213Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14824
Keywords
Li0.35La0.55TiO3 nanofibers; ionic conductivity; poly(vinylidene fluoride); composite polymer electrolytes; all-solid-state Li-metal batteries
Funding
- National Natural Science Foundation of China [11574273, 11504330]
- Research Starting Foundation of Shaanxi University of Science and Technology [2016XSGG-11]
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Using polymer electrolytes with relatively high mechanical strength, enhanced safety, and excellent flexibility to replace the conventional liquid electrolytes is an effective strategy to curb the Li-dendrite growth in Li-metal batteries (LMBs). However, low ionic conductivity, unsatisfactory thermal stability, and narrow electrochemical window still hinder their applications. Here, we fabricate Li0.35La0.55TiO3 (LLTO) nanofiber-enabled poly(vinylidene fluoride) (PVDF)-based composite polymer electrolytes (CPEs) with enhanced mechanical property and wide electrochemical window. The results show that 15 wt % of LLTO nanofibers synergize with PVDF, giving a flexible electrolyte membrane with significantly improved performance, such as high ionic conductivity (5.3 x 10(-4) S cm(-1)), wide electrochemical window (5.1 V), high mechanical strength (stress 9.5 MPa, strain 341%), and good thermal stability (thermal degradation 410 degrees C). In addition, an all-solid-state Li-metal battery of sandwich-type LiFePO4/PVDF-CPE (15 wt % of LLTO)/Li delivers satisfactory cycling stability and outstanding rate performance. A reversible capacity of 121 mA h g(-1) is delivered at 1 C after 100 cycles. This work exemplifies that the introduction of LLTO nanofibers can improve the electrochemical performances of PVDF-based CPEs used as electrolytes for all-solid-state LMBs.
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