Highly Stretchable Separator Membrane for Deformable Energy‐Storage Devices

Shin, Myoungsu; Song, Woo‐Jin; Son, Hye Bin; Yoo, Seungmin; Kim, Sungho; Song, Gyujin; Choi, Nam‐Soon; Park, Soo‐Jin

doi:10.1002/aenm.201801025

Cited by 55 publications

(53 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First demonstrations utilize non‐solvent internal phase separation (NIPS) to create separators with 60% porosity. [ 31 ] Despite good stretchability, the ionic conductivity of those NIPS is still lower as the conductivities found in polyacrylamide hydrogels. Highly stretchable polyHIPEs with porosities greater 75% can provide record high ionic conductivities, [ 26 ] yet they are unexploited for the use in stretchable batteries.…”

Section: Figurementioning

confidence: 99%

Stretchable Polymerized High Internal Phase Emulsion Separators for High Performance Soft Batteries

Danninger

Hartmann

Paschinger

et al. 2020

Advanced Energy Materials

View full text Add to dashboard Cite

large areas available on the skin or within the body. [3] Intrinsically stretchable batteries effectively make use of available space while perfectly complying to deformations and maintaining comfort for the wearer. [4][5][6] Recent developments exploit high-energydensity materials, such as Zn and Li-ion based batteries, [7][8][9][10] to enhance battery capacity and close the gap to rigid-island designs. [11] Despite the progress in capacity and rechargeability, the principle design of planar intrinsically stretchable batteries has largely remained unchanged. The interplay of electrodes, efficient current collectors, highly ionically conductive separators/gelelectrolytes, and their conformal orientation must collectively be optimized to boost battery performance. Promising solutions for single components, including multilayer current collectors, [12] tough electrodes, [13] and self-healing gel-electrolytes [14] were demonstrated recently. However, many prototypes still use the coplanar orientation of electrodes [4,12,[15][16][17] as proposed for the first soft batteries. [18] This design sacrifices performance due to increased ionic pathways in the gel electrolytes. Introducing a sandwich design of stacked battery components (Figure 1a), greatly reduces ionic pathways and therefore the internal resistance of the battery. [19] Soft (sandwich-design) batteries require electron-insulating separators, which have to meet high ion conductivity, extensibility, and chemical inertness. Hydrogels are often used in water-based systems, serving as gel Powering soft embodiments of robots, machines and electronics is a key issue that impacts emerging human friendly forms of technologies. Batteries as energy source enable their untethered operation at high power density but must be rendered elastic to fully comply with (soft) robots and human beings. Current intrinsically stretchable batteries typically show decreased performance when deformed due to design limitations, mainly imposed by the separator material. High quality stretchable separators such as gel electrolytes represent a key component of soft batteries that affects power, internal resistance, and capacity independently of battery chemistry. Here, polymerized high internal phase emulsions (polyHIPEs) are introduced as highly ionically conductive separators in stretchable (rechargeable) batteries. Highly porous (>80%) separators result in electrolyte to polyHIPE conductivity ratios of below 2, while maintaining stretchability of ≈50% strain. The high stretchability, tunable porosity, and fast ion transport enable stretchable batteries with internal resistance below 3 Ω and 16.8 mAh cm −2 capacity that power on-skin processing and communication electronics. The battery/separator architecture is universally applicable to boost battery performance and represents a step towards autonomous operation of conformable electronic skins for healthcare, robotics, and consumers.

show abstract

Section: Figurementioning

confidence: 99%

Stretchable Polymerized High Internal Phase Emulsion Separators for High Performance Soft Batteries

Danninger

Hartmann

Paschinger

et al. 2020

Advanced Energy Materials

View full text Add to dashboard Cite

show abstract

“…Park et al. first demonstrated a stretchable separator membrane for deformable energy‐storage devices via a facile and scalable nonsolvent‐induced phase separation (NIPS) method, as shown in Figure c . The NIPS process is one of the most promising fabrication methods for various porous membranes such as those used in energy‐storage devices .…”

Section: Materials For Stretchable Batteriesmentioning

confidence: 99%

Recent Progress in Stretchable Batteries for Wearable Electronics

Song

Yoo

Song

et al. 2019

Batteries & Supercaps

Self Cite

103

View full text Add to dashboard Cite

With the rapidly approaching implementation of wearable electronic devices such as implantable devices, stretchable sensors, and healthcare devices, stretchable power sources have aroused worldwide attention as a key component in this emerging field. Among stretchable power sources, batteries, which store electrical energy through redox reactions during charge/discharge processes, are an attractive candidate because of their high energy density, high output voltage, and long‐term stability. In recent years, extensive efforts have been devoted to developing new materials and innovative structural designs for stretchable batteries. This review covers the latest advances in stretchable batteries, focusing on advanced stretchable materials and their design strategies. First, we provide a detailed overview of the materials aspects of components in a stretchable battery, including electrode materials, solid‐state electrolytes, and stretchable separator membranes. Second, we provide an overview on various structural engineering strategies to impart stretchability to batteries (i. e., wavy/buckling structures, island‐bridge structures, and origami/kirigami structures). Third, we summarize recently reported developments in stretchable batteries based on various chemistries, including Li‐based batteries, multivalent‐based batteries, and metal‐air batteries. Finally, we discuss the future perspectives and remaining challenges toward the practical application of stretchable batteries with reliable mechanical robustness and stable electrochemical performance under a physical strain.

show abstract

“…High stretchability is a desirable feature of synthetic polymers for advanced applications such as electronics, actuators, and energy storage . Tremendous progress has been made in the engineering of highly stretchable polymers, with a maximum stretching ratio approaching 210× the original polymer lengths .…”

Section: Summary Of the Physical Properties Of The Various Pb Networkmentioning

confidence: 99%

Superstretchable Dynamic Polymer Networks

Huan

Yang

et al. 2019

Advanced Materials

View full text Add to dashboard Cite

stretchable polymeric materials include the use of double networks, [4][5][6] nanocomposites, [7] and dynamic polymer networks. [8][9][10][11][12][13][14][15][16][17] Among these strategies, dynamic polymer networks based on dynamic crosslinks such as hydrophobic association, [8] metal-ligand interactions, [9,10] host-guest interactions, [11] dynamic covalent bonds, [12] ion-dipole interactions, [13] hydrogen bonds, [14][15][16] and ion bonds [17] have attracted much attention. Compared with traditional covalent bonds, these dynamic crosslinks can effectively dissipate energy via reversible bond formation/scission or exchange reactions, [9,12,18] resulting in highly stretchable polymeric materials. Despite this progress, the construction of dynamic polymer networks with a stretching ratio beyond 1000× remains a great challenge. Here, we report the preparation of superstretchable polymer networks by using two types of dynamic bonds. We utilize a small number of strong crosslinks to maintain the network integrity during stretching and a large number of weak crosslinks to dissipate energy. We found that the synergetic interplay between these two mechanisms resulted in a superstretchable polymer network that could be stretched to more than 10 000× its original length.Specifically, polybutadiene (PB) networks crosslinked by ionic hydrogen bonds and imine bonds were prepared and examined. PB oligomers (liquid state, M w = 9400) were functionalized by amine and carboxyl groups via a thiol-ene reaction to obtain PB-NH 2 -9.8% and PB-COOH-5%, respectively (the number indicates the degree of functionalization; Figure S1 and Table S1, Supporting Information). Oligomeric PB was chosen because of the abundant vinyl double bonds (90% 1,2-addition) available for amine and carboxyl modification. PB-NH 2 -9.8% and PB-COOH-5% could be completely dissolved, and gel permeation chromatography (GPC) analysis showed that M w of the functionalized PB was similar to that of the original PB, revealing that no chemical crosslinking occurred during the thiol-ene reaction ( Figure S2, Supporting Information). Then, PB-NH 2 -9.8%, PB-COOH-5%, and benezene-1,3,5-tricarbaldehyde were mixed at different ratios. In this formulation, crosslinked polymer networks were constructed via the weak ionic hydrogen bonds between the amine and carboxyl groups and the strong imine bonds from the reaction of amine and aldehyde groups (Figure 1; Movie S1, Supporting Information). [19,20] PB networks with fixed crosslink degrees at 9.8%, but varied ratios and different orders of formation of the ionic hydrogen bonds and imine bonds, were prepared. The resultant networks were labeled PB-ion-imine-x-y and PB-imine-ion-y-x, where x and y indicate the concentration Superstretchable materials have many applications in advanced technological fields but are difficult to stretch to more than 1000× their original length. A superstretchable dynamic polymer network that can be stretched to 13 000× its original length is designed. It is revealed that superstretchability of...

show abstract

Highly Stretchable Separator Membrane for Deformable Energy‐Storage Devices

Cited by 55 publications

References 43 publications

Stretchable Polymerized High Internal Phase Emulsion Separators for High Performance Soft Batteries

Stretchable Polymerized High Internal Phase Emulsion Separators for High Performance Soft Batteries

Recent Progress in Stretchable Batteries for Wearable Electronics

Superstretchable Dynamic Polymer Networks

Contact Info

Product

Resources

About