Query: Energy storage devices

title: Evaluating Flexibility and Wearability of Flexible Energy Storage Devices
abstract: Hongfei Li obtained his Bachelor's degree from the School of Materials Science and Engineering, Central South University in 2009. After that, he received his Master's degree from the School of Materials Science and Engineering, Tsinghua University in 2012. He joined Dr. Chunyi Zhi's group as a PhD candidate in 2015 at City University of Hong Kong. His research focuses on flexible and wearable aqueous batteries and polymer electrolytes. Zijie Tang is a PhD student in the Department of Materials Science and Engineering, City University of Hong Kong. He received his Bachelor's degree from the School of Materials Science and Engineering, Central South University. His research mainly focuses on high performance Zn ion battery electrodes and polymer electrolytes for wearable energy storage devices.  Liu completed his Bachelor's degree in polymer science and engineering and Master's degree in materials science at Sichuan University, China. He joined Dr. Chunyi Zhi's group as a PhD candidate in 2016 at City University of Hong Kong, where he has started his research on flexible and wearable energy storage devices including supercapacitors and aqueous battery systems. Chunyi Zhi is currently an associate professor in the Department of Materials Science and Engineering, City University of Hong Kong. He received his PhD degree in physics from the Institute of Physics, Chinese Academy of Sciences. Then he moved to the National Institute for Materials Science (NIMS) in Japan as a post doctoral fellow, followed by an ICYS research fellow, researcher (faculty) and senior researcher (permanent) His research focuses on wearable and flexible energy storage devices and aqueous electrolyte batteries.

title: 3D printed electrochemical energy storage devices
abstract: 3D printing technology, which can be used to design functional structures by combining computer aided design and advanced manufacturing procedures, is regarded as a revolutionary and greatly attractive process for the fabrication of electrochemical energy storage devices. In comparison to traditional manufacturing methods, 3D printing possesses unique advantages in geometrical shape design as well as rapid prototyping, especially with high surface area complex 3D structure constructions. Recently, a number of 3D printed electrochemical energy storage devices have been reported, showing an increased interest of the scientific community. To further advance material design and technology development, comprehensive understanding of the strengths and weaknesses of each 3D printing technique and knowledge of recent progress in 3D printed electrochemical energy storage are indispensable. To that end, a literature review of recent advances of 3D printing technology for capacitive energy storage is provided herein. Emphasis is given on the design of printing materials, printing process and electrochemical performance of printed devices. Some 3D printed structural solid electrolytes for energy storage applications are also summarized. Discussion and outlook on the potential future designs and development of 3D printing for electrochemical energy storage devices are provided in the text.

title: In situ growth of Cu(OH)2@FeOOH nanotube arrays on catalytically deposited Cu current collector patterns for high performance flexible in plane micro sized energy storage devices
abstract: Although integrated energy storage devices, such as in plane micro supercapacitors (MSCs) are attractive for powering portable microelectronic devices, it is still challenging to develop patterning techniques with high practicability and to rationally design and fabricate electrochemically active materials using feasible procedures. Here, we propose a facile solution immersion method of fabricating interdigitated copper electrodes with an in situ converted array of Cu(OH)2@FeOOH nanotubes (NTs) A copper current collector can be patterned together with widely employed copper circuits by a facile copper patterning approach based on cost effective electroless catalytic deposition of copper with patterned Ag catalysts, which is greatly conducive to the integration of in plane energy storage devices into microelectronic systems. Furthermore, the rationally designed array of Cu(OH)2@FeOOH NTs, which was converted in situ from the patterned copper electrodes, was demonstrated to be an excellent electrochemically active material with advantages that included a porous structure with a large specific surface area, excellent wettability by the electrolyte, short ion diffusion lengths and one dimensional electron transport pathway. The resulting MSC devices that were fabricated with the interdigitated Cu(OH)2@FeOOH/Cu electrodes exhibited a high specific capacitance (58.0 mF cm 2 at 0.1 mA cm 2) a high energy density (18.07 mW h cm 2) excellent cycling stability and desirable flexibility.

title: Hybrid energy storage devices: Advanced electrode materials and matching principles
abstract: Hybrid energy storage devices (HESDs) combining the energy storage behavior of both supercapacitors and secondary batteries, present multifold advantages including high energy density, high power density and long cycle stability, can possibly become the ultimate source of power for multi function electronic equipment and electric/hybrid vehicles in the future. In this review, the recent progress made in the field of HESDs, with the main focus on the electrode materials and the matching principles between the positive and negative electrodes are critically reviewed. In particular, the classification and new progress of HESDs based on the charge storage mechanism of electrode materials are re combed. The newly identified extrinsic pseudocapacitive behavior in battery type materials, and its growing importance in the application of HESDs are specifically clarified. Prospects and the challenges for HESDs in the development of suitable electrode material and a comprehensive understanding on the matching principle are also discussed.

title: Metal organic frameworks for energy storage devices: Batteries and supercapacitors
abstract: The rise of metal organic frameworks (MOFs) that are distinctive class of porous materials has attained enormous consideration during the last decades owing to their controllable structures, high surface areas and tunable pore sizes. The applications of MOFs range from the traditional gas separation and storage, drug delivery, sensors and catalysis to the emerging field of energy storage devices, such as high energy density rechargeable batteries and supercapacitors. Metal organic frameworks are excellent candidates for electrode materials in electrochemical energy storage devices due to their irreplaceable morphology, appropriate functional linkers, high specific surface area and metal sites. Herein, a brief review is carried out on recent development in the utilization of metal organic framework based materials for rechargeable batteries and supercapacitors, which would be the prevailing guidance to the materials design and optimization for battery community and electrochemical energy storage applications.

title: Highly thermal conductivity of CNF/AlN hybrid films for thermal management of flexible energy storage devices.
abstract: As energy storage devices are becoming more highly integrated, it is inevitable that heat accumulation will occur under high power working conditions. Finding efficient thermal management materials for cooling down electronic components is an urgent problem for energy storage devices. In this work, a thermally conductive film with tailorable macroproperties is fabricated by using a simple vacuum filtration method, using cellulose nanofibrils as the polymer substrate and assembly with aluminum nitride nanosheets. The interaction between the cellulose nanofibrils and aluminum nitride nanosheets is studied, and the electronic components made using the composite exhibit excellent thermal conductivity, thermal stability and mechanical flexibility. A high thermal conductivity is achieved along the film surface (up to 4.20 W/mK for 25 wt. of aluminum nitride) This green material can effectively promote potential applications as lateral heat spreaders in flexible energy storage devices and the thermal conductivity may facilitate the applications in thermal management.

title: The Recent Advance in Fiber Shaped Energy Storage Devices
abstract: Over the past decades, the rapid development of mobile electronics has brought enormous convenience to our daily life. With these miniature electronic devices, the communication and social networking become more prompt and frequent among people. In the course of its evolvement, wearable electronic devices that can be directly worn onto human body or combined with daily textiles, experience a booming development.[1 3] These wearable electronic devices strongly demand indispensable, high performance power systems with small size, high flexibility and adaptability to comfort frequent deformations during usage.[4,5] However, conventional energy storage systems such as supercapacitors and lithium batteries are typically rigid and limited by their lifespan, which cannot effectively satisfy the above requirements. Fabricating high performance energy storage systems in a 1D shape like fiber is recognized as a promising strategy to Wearable electronic devices that can be directly worn on the human body or combined with daily textiles have experienced a booming development with the rapid development of mobile electronics. These wearable electronic devices strongly demand indispensable, high performance power systems with small size, high flexibility, and adaptability to comfort frequent deformations during usage. Fabricating high performance energy storage systems in a 1D shape like fiber is recognized as a promising strategy to address the above issues. These fiber shaped power systems with diameters from tens to hundreds of micrometers can adapt to various deformations for stable operation in close contact with the human body. It is also possible to further weave such 1D energy storage devices into breathable textiles with matching electrochemical performances for the wearable electronics. Here, the key advancements related to fiber shaped energy storage devices are reviewed, including the synthesis of materials, the design of structures, and the optimization of properties for the most explored energy storage devices, i.e. supercapacitors, aprotic lithium based batteries, as well as novel aqueous battery systems. The remaining challenges are finally discussed to highlight the future direction of the development of fiber shaped energy storage devices.

title: Ionic liquids for electrochemical energy storage devices applications
abstract: Ionic liquids, defined here as room temperature molten salts, composed mainly of organic cations and (in)organic anions ions that may undergo almost unlimited structural variations with melting points below 100 degC. They offer a unique series of physical and chemical properties that make them extreme important candidates for several energy applications, especially for clean and sustainable energy storage and conversion materials and devices. Ionic liquids exhibit high thermal and electrochemical stability coupled with low volatility, create the possibility of designing appropriate electrolytes for different type batteries and supercapacitors. Herein, varieties of ionic liquids applications are reviewed on their utilization as electrolytes for Li ion batteries, Na ion batteries, Li O2(air) batteries, Li Sulfur (Li S) batteries, supercapacitors and as precursors to prepare and modify the electrode materials, meanwhile, some important research results in recent years are specially introduced, and the perspective on novel application of ionic liquids is also discussed.

title: Custom Made Electrochemical Energy Storage Devices
abstract: A customizable electrochemical energy storage device is a key component for the realization of next generation wearable and biointegrated electronics. This Perspective begins with a brief introduction of the drive for customizable electrochemical energy storage devices. It traces the first decade development trajectory of the customizable electrochemical energy storage devices. It then discusses the challenges and future directions, calling for such devices that allow users to select, design, and change the properties (including capacity, flexibility, shapes, and functionalities) according to real life needs. Leveraging these customizable electrochemical energy storage devices will shed light on smarter programmable electrochemical energy storage devices to power future wearable and biointegrated electronics.

title: Printed Solar Cells and Energy Storage Devices on Paper Substrates
abstract: Paper is a flexible material, commonly used for information storage, writing, packaging, or specialized purposes. It also has strong appeal as a substrate in the field of flexible printed electronics. Many applications, including safety, merchandising, smart labels/packing, and chemical/biomedical sensors, require an energy source to power operation. Here, progress regarding development of photovoltaic and energy storage devices on cellulosic substrates, where one or more of the main material layers are deposited via solution processing or printing, is reviewed. Paper can be used simply as the flexible substrate or, exploiting its porous fiber like nature, as an active film by infiltration or copreparation with electronic materials. Solar cells with efficiencies of up to 9% on opaque substrates and 13% on transparent substrates are demonstrated. Recent developments in paper based supercapacitors and batteries are also reviewed with maximum achieved capacity of 1350 mF cm 2 and 2000 mAh g 1, respectively. Analyzing the literature, it becomes apparent that more work needs to be carried out in continuing to improve peak performance, but especially stability and the application of printing techniques, even roll to roll processing, over large areas. Paper is not only environmentally friendly and recyclable, but also thin, flexible, lightweight, biocompatible, and inexpensive.