Flexible Energy‐Storage Devices: Design Consideration and Recent Progress

Abstract

Flexible energy-storage devices are attracting increasing attention as they show unique promising advantages, such as flexibility, shape diversity, light weight, and so on; these properties enable applications in portable, flexible, and even wearable electronic devices, including soft electronic products, roll-up displays, and wearable devices. Consequently, considerable effort has been made in recent years to fulfill the requirements of future flexible energy-storage devices, and much progress has been witnessed. This review describes the most recent advances in flexible energy-storage devices, including flexible lithium-ion batteries and flexible supercapacitors. The latest successful examples in flexible lithium-ion batteries and their technological innovations and challenges are reviewed first. This is followed by a detailed overview of the recent progress in flexible supercapacitors based on carbon materials and a number of composites and flexible micro-supercapacitors. Some of the latest achievements regarding interesting integrated energy-storage systems are also reviewed. Further research direction is also proposed to surpass existing technological bottle-necks and realize idealized flexible energy-storage devices.

Paper‐Based Electrodes for Flexible Energy Storage Devices

“…Electronic or optoelectronic components on flexible substrates enable novel applications, such as flexible display, electronic textile, artificial electronic skin, distributed sensors, etc 1, 2, 3, 4, 5, 6, 7, 8, 9. Whilst various flexible electronics are commercially available nowadays, the development of flexible energy and power sources for these devices is slow 10, 11. Such a “rate‐limiting step” has greatly impeded the commercialization of these electronics.…”

Two-dimensional NiCo2O4nanosheet-coated three-dimensional graphene networks for high-rate, long-cycle-life supercapacitors

“…[1][2][3][4][5][6] There are mainly two types of supercapacitors, i.e. electric double-layer capacitors (EDLC) and pseudocapacitors.…”

Newborn 2D materials for flexible energy conversion and storage

“…These devices could exhibit stable performance after repeated stretching [4][5][6]. Certainly, each component of the flexible devices, such as active layers of the optoelectronic devices and current collectors of the batteries, should be mechanically stable and flexible [7][8].…”