Ion coordination to improve ionic conductivity in polymer electrolytes for high performance solid-state batteries
Nano Energy(2022)
摘要
Polymer electrolytes with high ionic conductivity and good mechanical stability, which can be achieved by the incorporation of oxide ceramics into polymer electrolytes, are critical for solid-state batteries. However, it is challenging to obtain selectivity and efficiency of lithium-ion (Li+) transport enhancements in polymer electrolytes by oxide ceramic additives because the free volume increase in the polymer matrix by oxide ceramic-polymer interactions facilitates simultaneous Li+ and anion transport. Herein, cerium-zirconium oxide (ZrxCe(1−x)O2) nanoparticles are demonstrated to be an effective additive for ion coordination modification to selectively improve Li+ transport in poly (ethylene oxide) (PEO) electrolytes. By anion adsorption using ZrxCe(1−x)O2 nanoparticles, the ionic interaction between Li+ and bis(trifluoromethanesulfon)imide (TFSI-) is weakened, the proportion of PEO-TFSI- mixed coordination with Li+ is reduced, and Li+ coordination is modified. Therefore, after Li+ coordination modification, the PEO electrolyte with Zr0.5Ce0.5O2 nanoparticles achieves a high ionic conductivity of 7.3 × 10−5 S cm−1 and a high lithium transfer number of 0.42 at 30 ºC. Our work suggests that ion coordination modification by oxide ceramics can selectively improve the solid diffusion kinetics of Li+. This research provides new insights into the mechanism of Li+ transport.
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关键词
Anion adsorption,Li+ coordination modification,Ionic conductivity,Oxide ceramic additives,Polymer electrolyte
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