用于电场增强高性能柔性面内微型超级电容器的工程几何电极,Energy & Environmental Materials

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用于电场增强高性能柔性面内微型超级电容器的工程几何电极
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2022-12-27 , DOI: 10.1002/eem2.12581
Jihong Kim ₁ , Sung Min Wi ₁ , Jong‐Guk Ahn ₂ , Sangjun Son ₁ , HeeYoung Lim ₁ , Yeonsu Park ₁ , Hye Ji Eun ₁ , Jong Bae Park ₃ , Hyunseob Lim ₂ , Sangyeon Pak ₄ , A‐Rang Jang ₅ , Young‐Woo Lee ₁

Affiliation

平面微型超级电容器是一种小型化的储能元件，由于其高功率密度适用于各种普遍存在的可持续设备系统，并且易于集成在各种柔性/可穿戴平台上，因此引起了人们的广泛关注。为了在可伴随固态或凝胶电解质和柔性基板的各种实际应用中实现微型超级电容器，离子必须易于传输到电极以实现高功率密度。在此，我们展示了使用锋利边缘叉指电极设计的柔性面内微型超级电容器的电化学性能的大幅提高，该电极通过直接激光划片方法简单地制造。锋利的电极允许在电极指的拐角处感应出强电场，从而导致电极表面附近更多的离子积累，从而显着增强微型超级电容器的储能性能。电场增强面内微型超级电容器的体积能量密度为1.52 Wh·L⁻¹和优异的循环性能，20 000 次循环后电容保持率为 95.4%。通过展示电路适用性、机械稳定性和空气稳定性，我们进一步展示了我们的尖端设计在微型超级电容器中的各种实用性。这些结果为设计各种储能装置中的电极提供了重要途径。

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Engineering Geometric Electrodes for Electric Field-Enhanced High-Performance Flexible In-Plane Micro-Supercapacitors

In plane micro-supercapacitors that are miniaturized energy storage components have attracted significant attention due to their high power densities for various ubiquitous and sustainable device systems as well as their facile integration on various flexible/wearable platform. To implement the micro-supercapacitors in various practical applications that can accompany solid state or gel electrolyte and flexible substrates, ions must be readily transported to electrodes for achieving high power densities. Herein, we show large enhancement in electrochemical properties of flexible, in-plane micro-supercapacitor using sharp-edged interdigitated electrode design, which was simply fabricated through direct laser scribing method. The sharp-edged electrodes allowed strong electric field to be induced at the corners of the electrode fingers which led to the greater accumulation of ions near the surface of electrode, significantly enhancing the energy storage performance of micro-supercapacitors. The electric field-enhanced in-plane micro-supercapacitor showed the volumetric energy density of 1.52 Wh L⁻¹ and the excellent cyclability with capacitive retention of 95.4% after 20 000 cycles. We further showed various practicability of our sharp-edged design in micro-supercapacitors by showing circuit applicability, mechanical stability, and air stability. These results present an important pathway for designing electrodes in various energy storage devices.

更新日期：2022-12-27

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