In this work, we for the first time developed a novel lithium-containing crosslinked polymeric material, a lithicone that enables excellent protection effects over lithium (Li) metal anodes. This new lithicone was synthesized via an accurately controllable molecular layer deposition (MLD) process, in which lithium tert-butoxide (LTB) and glycerol (GL) were used as precursors. The resultant LiGL lithicone was analyzed using a suite of characterizations. Furthermore, we found that the LiGL thichicone could serve as an exceptional polymeric protection film over Li metal anodes. Our experimental data revealed that the Li electrodes coated by this LiGL lithicone can achieve a superior cycling stability, accounting for an extremely long cyclability of >13,600 Li-stripping/plating cycles and having no failures so far in Li/Li symmetric cells at a current density of 5 mA/cm2 and an areal capacity of 1 mAh/cm2. We found that, with a sufficient protection by this LiGL coating, Li electrodes could realize long-term stable cyclability with little formation of Li dendrites and solid electrolyte interphase. This novel LiGL represents a facile and effective solution to the existing issues of Li anodes and potentially paves a technically feasible route for lithium metal batteries.
In this article, the authors report the synthesis and tribological behavior of Ti3SiC2–PEEK composites during dry sliding. These composites were designed by adding 5 vol.% (PEEK–5%312Si), 10 vol.% (PEEK–10%312Si), 20 vol.% (PEEK–20%312Si), and 30 vol.% Ti3SiC2 (PEEK–30%312Si) particulates in the PEEK matrix. Tab-on-disc method was used to study the tribological behavior of these samples during self-mating. As the Ti3SiC2 content in PEEK was increased from 0 to 30 vol.%, the µmean decreased from ∼0.19 to ∼0.14 in PEEK–10%312Si, thereafter, it increased to ∼0.21 in PEEK–20%312Si and PEEK–30%312Si, respectively. The addition of Ti3SiC2 particulates had a huge on impact on the wear resistance, e.g. PEEK–5%312Si was 27 times more wear resistant than the PEEK. It is hypothesized that the presence of Ti3SiC2 particulates lubricated the tribocontact areas and assisted in the formation of Type IIIa lubricious tribofilms.
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