High-performance all-inorganic portable electrochromic Li-ion hybrid supercapacitors toward safe and smart energy storage
High-performance all-inorganic portable electrochromic Li-ion hybrid supercapacitors toward safe and smart energy storage
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高性能全无机便携式电致变色锂离子混合超级电容器走向安全智能储能
DOI：
10.1016/j.ensm.2020.08.023
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发表时间：
2020-08
影响因子：
20.4
通讯作者：
Kai Du
中科院分区：
文献类型：
--
作者：
Lei Liu;Xungang Diao;Zhibing He;Yong Yi;Tao Wang;Mengying Wang;Jinglin Huang;Xiaoshan He;Xiaolan Zhong;Kai Du
锂离子混合超级电容器（LHSs）填补了电池和超级电容器之间的差距，同时由于其在智能便携式电子设备中的潜在应用而引起了极大的关注。然而，获得具有优异环境兼容性和智能显示功能的全无机LHS仍然是一个巨大的挑战。在此，我们设计并构建了一种新型的无机电致变色锂离子混合超级电容器（ELHS），通过将电池型（LiMn 2 O 4）和超级电容器型（WO 3）电致变色材料合并到一个单元中。所得到的ELHS在电化学过程中实现了稳定和可逆的颜色转换，提供了足够的实时信息的工作状态。得益于单个有源电极的匹配电位窗口和整个器件的全无机结构，优化的ELHS表现出2.5 V的扩展工作电压。令人印象深刻的是，ELHS表现出极高的体积能量/功率密度（16.2 W cm−3/0.21 Wh cm−3）和出色的循环稳定性，5000次循环后的电容保持率约为95.4%。所观察到的性能特征优于大多数先前报道的电致变色能量存储装置，并且与一些商业装置相当。值得注意的是，ELHS中引入了无机电解质，使其具有出色的环境适应性和在逐渐变化的温度（0-75 °C）下工作的能力。我们设想，这项工作可能为开发下一代安全便携的混合储能设备开辟新的途径。
Li-ion hybrid supercapacitors (LHSs) bridged the gap between batteries and supercapacitors, and simultaneously attracted tremendous attention because of their potential applications in intelligent portable electronic devices. Nevertheless, obtaining all-inorganic LHSs with excellent environmental compatibility and smart display features remains a remarkable challenge. Herein, we designed and constructed a novel ultrathin all-inorganic electrochromic Li-ion hybrid supercapacitor (ELHS) by incorporating battery-type (LiMn2O4) and supercapacitor-type (WO3) electrochromic materials into one cell. The resultant ELHS achieved stable and reversible chromatic transitions during the electrochemical process, providing sufficient real-time information on the working status. Benefiting from the matching potential windows of the individual active electrodes and the all-inorganic construction of the whole device, the optimized ELHS exhibited an extended working voltage of 2.5 V. Impressively, the ELHS demonstrated an ultrahigh volumetric energy/power density (16.2 W cm−3/0.21 Wh cm−3) and remarkable cycling stability with ~95.4% capacitance retention after 5000 cycles. The observed performance characteristics outperformed most previously reported electrochromic energy storage devices and were comparable to some commercial devices. Significantly, inorganic electrolytes were introduced into the ELHS, which endowed it with outstanding environmental adaptability and ability to work at progressively varying temperatures (0–75 °C). We envision that this work may open new avenues for the development of next-generation safe and portable hybrid energy storage devices.
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