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首页> 外文期刊>RSC Advances >Effect of morphological change of copper-oxide fillers on the performance of solid polymer electrolytes for lithium-metal polymer batteries
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Effect of morphological change of copper-oxide fillers on the performance of solid polymer electrolytes for lithium-metal polymer batteries

机译：氧化铜填料的形态变化对锂金属聚合物电池固体聚合物电解质性能的影响

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Solid polymer electrolytes (SPEs) for Li-metal polymer batteries are prepared, in which poly(ethylene oxide) (PEO), lithium bis(trifluoromethylsulfonyl)imide (LiTFSI), and copper-oxide fillers are formulated. Their structural and electrochemical properties are analyzed when the morphology of the copper-oxide fillers has been modulated to spherical or dendritic structure. The ionic conductivity obtained by electrochemical impedance spectroscopy (EIS) has been increased to 1.007 × 10 ~(?4) S cm ~(?1) at 30 °C and 1.368 × 10 ~(?3) S cm ~(?1) at 60 °C, as the 5 wt% dendritic fillers have been added to the SPEs. This ionic conductivity value is 1.3 times higher than that of 5 wt% spherical filler-contained SPEs. The analyses of differential scanning calorimetry (DSC) and X-ray diffraction (XRD) indicate that the increase of ionic conductivity is due to the remarkable decrease of crystallinity upon the addition of copper-oxide filler into PEO matrix of SPEs. The fabricated SPEs with the dendritic copper-oxide fillers present a total ionic transference number of 0.99 and a lithium-ion transference number of 0.38. More importantly, it presents a stable potential window of 2.0–4.8 V at 25 °C and high thermal stability up to 300 °C. The specific discharge capacity of the prepared cell with the dendritic filler-contained SPEs is measured to be 51 mA h g ~(?1) and 125 mA h g ~(?1) under 0.1 current-rate (C-rate) at 25 °C and 60 °C, respectively. In this study, the ionic conductivity and the electrochemical performance of the PEO-based polymer electrolyte have been evaluated when morphologically different copper-oxide fillers have been incorporated into the PEO matrix. We have also confirmed the safety and the flexibility of the prepared solid polymer electrolytes when they are used in flexible lithium-metal polymer batteries (LMPBs).
机译：制备用于锂金属聚合物电池的固体聚合物电解质（SPE），其中配制了聚环氧乙烷（PEO），双（三氟甲基磺酰基）酰亚胺锂（LiTFSI）和氧化铜填料。当将氧化铜填料的形态调节为球形或树枝状结构时，分析了它们的结构和电化学性能。通过电化学阻抗谱（EIS）获得的离子电导率在30°C和1.368×10〜（？3）S cm〜（？1）下已增加至1.007×10〜（？4）S cm〜（？1）在60°C下，将5 wt％的树枝状填料添加到SPE中。该离子电导率值是含5％球形填料的SPE的1.3倍。差示扫描量热法（DSC）和X射线衍射（XRD）的分析表明，离子电导率的提高是由于在SPE的PEO基体中添加氧化铜填料后结晶度显着下降。带有树枝状氧化铜填料的SPE的总离子迁移率为0.99，锂离子迁移率为0.38。更重要的是，它在25°C时具有2.0–4.8 V的稳定电势窗口，在300°C时仍具有很高的热稳定性。在25°C下，以0.1电流速率（C速率）测定的带有树枝状填料的SPE制备的电池的比放电容量为51 mA hg〜（？1）和125 mA hg〜（？1）。和60°C。在这项研究中，当在形态上不同的氧化铜填料被掺入PEO基体中时，已经评估了PEO基聚合物电解质的离子电导率和电化学性能。我们还证实了制备的固体聚合物电解质用于柔性锂金属聚合物电池（LMPB）的安全性和灵活性。

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