Abstract
The spherical-like and honeycomb structural Li0.1Ca0.9TiO3 particles are prepared by spray drying combined with following calcination confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive X-ray spectrometer (EDS). The poly (vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP))-based composite polymer electrolytes (CPEs) modified with the particles are fabricated by phase inversion and activation processes. The characterization results show that the as-prepared CPE membranes possess the smoothest surface and most abundant micropores with the lowest crystallinity with adding the particles into the polymer matrix, which results in high ionic conductivity (3.947 mS cm−1) and lithium ion transference number (0.4962) at ambient temperature. The interfacial resistance can be quickly stabilized at 508 Ω after 5 days storage and the electrochemical working window is up to 5.2 V. Moreover, the mechanical strength of the membranes gains significant improvement without lowering the ionic conductivity. Furthermore, the assembled coin cell can also deliver high discharge specific capacity and preserve steady cycle performance at different current densities. Those outstanding properties may be ascribed to the distinctive structure of the tailored spherical-like and honeycomb structural Li0.1Ca0.9TiO3 particles, which can guarantee the desirable CPEs as a new promising candidate for the polymer electrolyte.
Highlights
At present, more and more attentions have been invested into the polymer electrolytes in the field of the lithium ion battery, which can realize the flexible assembly of the packed battery, and effectively prevent the explosion and spontaneous combustion incidents of the assembled battery (Croce et al, 1998; Song et al, 1999; Scrosati, 2000; Wang et al, 2014; Wu et al, 2017b; He et al, 2018a)
Those results suggest that the spherical-like and honeycomb structural Li0.1Ca0.9TiO3 particles are successfully synthesized by spray drying combined with following calcination
The results suggest that the battery assembled with the composite polymer electrolytes (CPEs) may present excellent interfacial performance, especially with the CPE-LCT, which can be mainly ascribed to the added spherical-like and honeycomb structural Li0.1Ca0.9TiO3 particles that can markedly improve the compatibility between the electrodes and the as-prepared CPEs by entrapping any impurities such as water and trace organic solvent to inhibit the destructive reaction on the electrodes (Xiao et al, 2016)
Summary
More and more attentions have been invested into the polymer electrolytes in the field of the lithium ion battery, which can realize the flexible assembly of the packed battery, and effectively prevent the explosion and spontaneous combustion incidents of the assembled battery (Croce et al, 1998; Song et al, 1999; Scrosati, 2000; Wang et al, 2014; Wu et al, 2017b; He et al, 2018a). Those results indicate that the as-prepared Li0.1Ca0.9TiO3 particles can absorb and retain more liquid electrolytes, and provide more extra passages for lithium ions transfer, which can markedly improve the battery performance.
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