Abstract

Continuous technical advancements in a variety of industries, such as portable electronics, transportation, green energy, are frequently hampered by the inadequacy of energy-storage technologies. Asymmetric supercapacitors can expand their operating voltage window past the thermodynamic breakdown voltage of electrolytes by utilizing two distinct electrode materials, providing a workaround for the symmetric supercapacitors’ energy storage constraints. This evaluation offers a thorough understanding of this area. To comprehend the extensive research done in this field, we first examine the fundamental energy-storage mechanisms and performance evaluation standards for asymmetric supercapacitors. The most recent developments in the design and manufacture of electrode materials as well as the general structure of asymmetric supercapacitors. We have also discussed a number of significant scientific issues and offer our opinions on how to improve the electrochemical properties of future asymmetric energy storage devices. First, methods for designing high-performance electrode materials for supercapacitors must be developed; next, controllably built supercapacitor types must be attained (such as symmetric capacitors including double-layer and pseudocapacitors, asymmetric capacitors, and Li-ion capacitors). This review is timely because of the rapid expansion of research in this area. It summarizes recent developments in the study and creation of high-performance electrode materials with high supercapacitors. A number of crucial topics for enhancing the energy density of supercapacitors are examined, along with some reciprocal correlations between the main impacting parameters. Difficulties and prospects in this fascinating field are also covered. This offers a fundamental understanding of supercapacitors and serves as a crucial design rule for enhanced next-generation supercapacitors that will be used in both industrial and consumer applications. In this context, we extensively reviewed the classification of supercapacitor, EDLC (activated carbon, carbon aerogel, carbon nanotube), Pseudocapacitors, conducting polymers, metal oxides, hybrid materials, composite hybrids, rechargeable batteries, asymmetric devices and its design, aqueous solid state, fiber based asymmetric device, graphene based asymmetric device, terminologies used during the electrode selection, positive and negative electrodes in asymmetric device, material used for fabrication of negative electrodes, electrochemical performance of various devices which are fabricated by different electrode materials. Performance of material for various asymmetric device applications, conclusions outlook, recent developments in asymmetric devices. The current review may offer a thorough understanding and future prospects for developing negative electrodes to enhance asymmetric supercapacitor performance.

摘要

便携式电子产品、交通运输、绿色能源等多个行业的持续技术进步经常因储能技术的不足而受阻。通过使用两种不同的电极材料，非对称超级电容器可以将其工作电压窗口扩大到超过电解质的热力学击穿电压，从而为对称超级电容器的储能限制提供了一种解决方法。该评估提供了对该领域的透彻了解。为了理解在这一领域所做的广泛研究，我们首先研究了非对称超级电容器的基本储能机制和性能评估标准。电极材料设计和制造的最新进展以及非对称超级电容器的一般结构。我们还讨论了一些重要的科学问题，并就如何改善未来不对称储能装置的电化学性能提出了我们的意见。首先，必须开发设计用于超级电容器的高性能电极材料的方法；接下来，必须获得可控构建的超级电容器类型（例如对称电容器，包括双层和赝电容器、非对称电容器和锂离子电容器）。由于该领域研究的迅速扩展，这篇综述是及时的。它总结了高性能超级电容器电极材料研究和创造的最新进展。研究了提高超级电容器能量密度的许多关键主题，以及主要影响参数之间的一些相互关系。还涵盖了这个迷人领域的困难和前景。这提供了对超级电容器的基本理解，并作为用于工业和消费应用的增强型下一代超级电容器的关键设计规则。在此背景下，我们广泛回顾了超级电容器的分类、EDLC（活性炭、碳气凝胶、碳纳米管）、赝电容器、导电聚合物、金属氧化物、杂化材料、复合杂化物、可充电电池、非对称器件及其设计、含水固态，基于纤维的不对称装置，基于石墨烯的不对称装置，电极选择过程中使用的术语，不对称装置中的正极和负极，用于制造负极的材料，不同电极材料制备的各种器件的电化学性能。各种不对称器件应用的材料性能、结论展望、不对称器件的最新发展。当前的综述可能会为开发负电极以增强不对称超级电容器性能提供透彻的理解和未来前景。