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High rate and stable symmetric potassium ion batteries fabricated with flexible electrodes and solid-state electrolytes†
Nanoscale ( IF 5.8 ) Pub Date : 2018-10-15 00:00:00 , DOI: 10.1039/c8nr07268j Ke Lu 1, 2, 3, 4 , Hong Zhang 5, 6, 7, 8, 9 , Siyuan Gao 1, 2, 3, 4 , Yingwen Cheng 1, 2, 3, 4 , Houyi Ma 5, 6, 7, 8, 9
Nanoscale ( IF 5.8 ) Pub Date : 2018-10-15 00:00:00 , DOI: 10.1039/c8nr07268j Ke Lu 1, 2, 3, 4 , Hong Zhang 5, 6, 7, 8, 9 , Siyuan Gao 1, 2, 3, 4 , Yingwen Cheng 1, 2, 3, 4 , Houyi Ma 5, 6, 7, 8, 9
Affiliation
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Aqueous batteries designed with K-ions have outstanding potential for future energy storage applications. When coupled with cathode and anode materials both operating with the intercalation mechanism, K-ion batteries could have kinetics and stability similar to Li-ion batteries in principle but with a much lower cost. However, the electrode materials developed so far still suffer from poor stability and limited activity, especially from the anode side. Herein, a new concept of symmetric K-ion batteries was developed by using potassium Prussian blue (KPB) as a bipolar material. The KPB particles were grown on flexible and strong wiper cloth substrates that were pre-coated with polypyrrole (PPy). The use of PPy as an interlayer not only boosted electrical conductivity but also ensured uniform growth of KPB particles. The synthesized KPB@PPy@wiper electrodes have superior flexibility and stability, and exhibited two redox pairs both with remarkable kinetics. When used as bipolar electrodes in combination with a gel solid-state electrolyte, they delivered a well-defined discharge voltage plateau at ∼0.6 V with superior rate capability and cycling stability. This work could provide new insights into the design of K-ion batteries, and give new options for developing flexible solid-state devices.
中文翻译：
由柔性电极和固态电解质制成的高速率且稳定的对称钾离子电池†
用K离子设计的水电池在未来的储能应用中具有巨大的潜力。当与均通过插入机制运行的阴极和阳极材料耦合时，K离子电池在原理上可以与Li离子电池具有相似的动力学和稳定性，但成本要低得多。然而，迄今为止开发的电极材料仍然具有较差的稳定性和有限的活性，特别是从阳极侧来看。在此，通过使用普鲁士钾钾（KPB）作为双极材料开发了对称K离子电池的新概念。使KPB颗粒生长在预先涂有聚吡咯（PPy）的柔软，结实的擦拭布基底上。PPy作为中间层的使用不仅提高了电导率，而且还确保了KPB颗粒的均匀生长。合成的KPB @ PPy @ wiper电极具有出色的柔韧性和稳定性，并显示出两个氧化还原对，两者均具有出色的动力学性能。当与凝胶固态电解质结合用作双极电极时，它们可在〜0.6 V的电压下提供良好的稳定放电平台，具有出色的倍率能力和循环稳定性。这项工作可以为K离子电池的设计提供新的见解，并为开发灵活的固态设备提供新的选择。
更新日期：2018-10-15
中文翻译：
由柔性电极和固态电解质制成的高速率且稳定的对称钾离子电池†
用K离子设计的水电池在未来的储能应用中具有巨大的潜力。当与均通过插入机制运行的阴极和阳极材料耦合时，K离子电池在原理上可以与Li离子电池具有相似的动力学和稳定性，但成本要低得多。然而，迄今为止开发的电极材料仍然具有较差的稳定性和有限的活性，特别是从阳极侧来看。在此，通过使用普鲁士钾钾（KPB）作为双极材料开发了对称K离子电池的新概念。使KPB颗粒生长在预先涂有聚吡咯（PPy）的柔软，结实的擦拭布基底上。PPy作为中间层的使用不仅提高了电导率，而且还确保了KPB颗粒的均匀生长。合成的KPB @ PPy @ wiper电极具有出色的柔韧性和稳定性，并显示出两个氧化还原对，两者均具有出色的动力学性能。当与凝胶固态电解质结合用作双极电极时，它们可在〜0.6 V的电压下提供良好的稳定放电平台，具有出色的倍率能力和循环稳定性。这项工作可以为K离子电池的设计提供新的见解，并为开发灵活的固态设备提供新的选择。
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