Boosting the ionic conductivity of PEO electrolytes by waste eggshell-derived fillers for high-performance solid lithium/sodium batteries,Materials Chemistry Frontiers

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Boosting the ionic conductivity of PEO electrolytes by waste eggshell-derived fillers for high-performance solid lithium/sodium batteries
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-08-18 , DOI: 10.1039/d0qm00541j
Laiqiang Xu _{1,

2,

3,

4} , Jiayang Li _{1,

2,

3,

4} , Wentao Deng _{1,

2,

3,

4} , Lin Li _{1,

2,

3,

4} , Guoqiang Zou _{1,

2,

3,

4} , Hongshuai Hou _{1,

2,

3,

4} , Lanping Huang _{2,

3,

4,

5} , Xiaobo Ji _{1,

2,

3,

4}

Affiliation

Poly(ethylene oxide) (PEO)-based polymer electrolytes are extensively investigated, and they have rapidly developed in all-solid-state batteries (ASSBs) over recent years for their good interface contact with electrodes, easy shaping and decent flexibility. However, their low ionic conductivity remains a serious issue to be solved urgently. Researchers have found that the addition of fillers can improve the ionic conductivity via creating more amorphous regions conducive to ion transport in PEO. Here, we adopted waste eggshell as a precursor to prepare a sub-micron filler, which is mainly CaO, and it was added into the PEO electrolyte to get a composite polymer electrolyte. Close contact via Lewis base-acid interaction between CaO and PEO can be obtained, as CaO is an effective filler with strong alkalinity. To the best of our knowledge, this is the first time it is applied in the PEO electrolyte. The filler significantly decreases the crystallinity of PEO, and hence, boosted ionic conductivity of the composite polymer electrolyte is observed, which is about 4.5 times higher than that of the polymer reference electrolyte. It additionally brings a higher tensile strength along with a more stable electrochemical window (up to 5 V) to the composite electrolyte. Therefore, as expected, the all-solid-state Li/Na battery with this composite electrolyte exhibits long cycling life and excellent rate performances. The corresponding Li/LiFeO₄ battery has a stable capacity of 142.8 mA h g⁻¹ at 1C after 200 cycles, and the corresponding solid-state Na/Na₃V₂(PO₄)₃ battery gives a reversible capacity of 101.2 mA h g⁻¹ at 0.5C after 100 cycles.

中文翻译：

通过废蛋壳衍生的填料提高高性能固体锂/钠电池的PEO电解质的离子电导率

对基于聚环氧乙烷（PEO）的聚合物电解质进行了广泛的研究，由于其与电极的良好界面接触，易于成型和良好的柔韧性，近年来它们在全固态电池（ASSB）中得到了快速发展。然而，它们的低离子电导率仍然是亟待解决的严重问题。研究人员发现，添加填料可以通过创建更多有助于PEO中离子迁移的无定形区域来改善离子电导率。在这里，我们以废鸡蛋壳为前驱物，制备了以CaO为主要成分的亚微米填料，然后将其添加到PEO电解质中以获得复合聚合物电解质。通过密切联系由于CaO是具有强碱性的有效填料，因此可以在CaO和PEO之间获得路易斯碱-酸相互作用。据我们所知，这是第一次将其应用于PEO电解质中。填料显着降低了PEO的结晶度，因此，观察到复合聚合物电解质的离子电导率提高，这是聚合物参考电解质的约4.5倍。此外，它还为复合电解质带来了更高的拉伸强度以及更稳定的电化学窗口（最高5 V）。因此，正如预期的那样，具有这种复合电解质的全固态锂/钠电池具有长循环寿命和出色的倍率性能。相应的Li / LiFeO ₄电池具有142.8 mA hg ^-1的稳定容量在200个循环后于1C时，在100个循环后，相应的固态Na / Na ₃ V ₂（PO ₄）₃电池在0.5C时可逆容量为101.2 mA hg ^-1。

更新日期：2020-08-18

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