High energy density solid state symmetric supercapacitors using ionic liquid dispersed Li+ ion-perovskites†

IF 4.6 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
RSC Advances Pub Date : 2025-01-27 DOI:10.1039/D4RA07417C
Bhargab Sharma, Shrishti Sharma, Gurpreet Kaur, Hardeep and Anshuman Dalvi
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Abstract

The study reports solid-state ceramic supercapacitors (SSCs) assembled using a novel composite electrolyte based on Li+ ion conducting perovskite-type LLTO (Li0.34La0.51TiO3) and an ionic liquid (EMIM BF4). Small amounts of various ionic liquids (ILs) were added to LLTO to enhance the ionic conductivity and improve electrode compatibility. The optimal composition with approximately ∼6 wt% EMIM BF4 in LLTO exhibited a high ionic conductivity of around ∼10−3 Ω−1 cm−1 at room temperature, nearly three orders of magnitude higher than that of the pristine LLTO. Optimized electrolyte composition was therefore used for fabrication by compressing between high surface area activated carbon-coated copper electrodes and assembled in an affordable lamination cell geometry. The SSCs demonstrated stable cycling performance for at least 10 000 cycles at 2 V operating voltage and 1.13 A g−1 (2 mA) discharge current, with a remarkably high coulombic efficiency of ∼99%. A typical laminated cell at 35 °C exhibited a specific capacitance of around 510 F g−1 at 0.57 A g−1 (1 mA), and 2 V. Supercapacitors operating below 2 V showed a pure electric double-layer type nature. A stack of 4 cells in series can power two white LEDs (6 V) for ∼40 minutes.

Abstract Image

利用离子液体分散Li+离子-钙钛矿制备高能量密度固态对称超级电容器。
该研究报告了使用基于Li+离子导电钙钛矿型LLTO (Li0.34La0.51TiO3)和离子液体(EMIM BF4)的新型复合电解质组装的固态陶瓷超级电容器(ssc)。在LLTO中加入少量的各种离子液体(ILs),以提高离子电导率,改善电极相容性。在LLTO中加入约6 wt% EMIM BF4的最佳组合物在室温下表现出约10-3 Ω-1 cm-1的高离子电导率,比原始LLTO高出近3个数量级。因此,通过在高表面积活性炭涂层铜电极之间进行压缩,并将其组装在经济实惠的层压电池几何结构中,优化的电解质成分被用于制造。在2v工作电压和1.13 A g-1 (2 mA)放电电流下,ssc具有至少10000次的稳定循环性能,库仑效率高达99%。典型的层压电池在35°C时,在0.57 A g-1 (1 mA)和2 V下的比电容约为510 F -1。工作在2v以下的超级电容器表现为纯电双层型。4个电池串联堆叠可以为两个白光led (6 V)供电约40分钟。
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来源期刊
RSC Advances
RSC Advances chemical sciences-
CiteScore
7.50
自引率
2.60%
发文量
3116
审稿时长
1.6 months
期刊介绍: An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.
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