Flexible Aqueous Li‐Ion Battery with High Energy and Power Densities

Yang, Chengliang; Ji, Xiao; Fan, Xiulin; Gao, Tao; Suo, Liumin; Wang, Fei; Sun, Wei; Chen, Ji; Chen, Long; Han, Fudong; Liu, Miao; Xu, Ke; Gerasopoulos, Konstantinos; Wang, Chunsheng

doi:10.1002/adma.201701972

Cited by 180 publications

(112 citation statements)

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“…The measurements were performed by a three‐electrode system, with WiS and PAM‐WiS, respectively, as the working electrode, a Pt disk as the counter electrode, and saturated Ag/AgCl as the reference electrode. The 22 m WiS aqueous electrolyte is found to be stable, that is, without O 2 /H 2 evolution, between 1.7 and 4.98 V (vs Li/Li + , same for all the other potential expressions), offering a working window of 3.28 V, which is similar to previously reported results 14a,d,15. The working window of the PAM‐WiS electrolyte is slightly narrowed down to between 1.95 and 4.93 V. We assume that this is because two types of water molecules exist in the hydrogel: Some that are partially solvated by LiTFSI and others that are partially bonded to the PAM network.…”

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confidence: 89%

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Fully Integrated Design of a Stretchable Solid‐State Lithium‐Ion Full Battery

et al. 2019

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a conventional battery, such as good electrochemical performance, affordable price, and high safety.A conventional full cell LIB is a complicated device, composed of a current collector, a cathode, an anode, a separator, an electrolyte, and a proper packaging. To fabricate a stretchable full cell, we need to replace all these components with materials that can provide simultaneously the appropriate electrochemical functionalities as well as the intrinsic mechanical stretchability. Many components that could potentially be used in a stretchable battery have been presented in the literature. For example, several approaches have been reported for fabricating stretchable electrodes by incorporating rigid electrode materials within a porous framework, with a wavy design, or with helically coiled spring configuration. [6] However, these structures are usually complicated and costly to produce and scale-up, and, due to the use of polydimethylsiloxane (PDMS) or other substrates, the cells are thick and heavy. [7] Also, stretchable composite conductors for applications in electronics have been widely investigated. [8] However, there are only very few reports targeting battery current collectors. [7,9] The sheet resistances of the reported materials range from around 150 to 200 Ω □ −1 in the unstretched states and get much higher when stretched, producing significant internal resistance. Polymer gel electrolytes (PGEs) composed of poly(vinylidene fluoride) (PVDF), [10] poly(ethylene glycol) (PEG), [11] poly(ethylene oxide) (PEO), [12] or poly(ionic liquid) [13] are widely accepted as promising solution for flexible LIBs due to their advantageous flexibility, safety, and packaging behavior compared to the liquid electrolytes with a porous separator. Unfortunately, PGEs usually show quite a low room temperature ionic conductivity that ranges from 10 −4 to 10 −3 S cm −1 . Since 2015, "water-in-salt" (WiS) aqueous electrolytes containing extremely concentrated lithium salt have been investigated. [14] Some of these WiS-based gel electrolytes have also been reported to show better safety and robustness compared with the conventional PGE. [15] However, none of these materials exhibited mechanical stretchability.It is interesting to note that although so many stretchable battery components have been reported, their processing into full cells is rarely described, and even in these cases, usually not all the LIB components were made stretchable. [7,16] The reason for this is the diffculty in obtaining robust conductive interfaces between the battery components enabling efficient ion and A solid-state lithium-ion battery, in which all components (current collector, anode and cathode, electrolyte, and packaging) are stretchable, is introduced, giving rise to a battery design with mechanical properties that are compliant with flexible electronic devices and elastic wearable systems. By depositing Ag microflakes as a conductive layer on a stretchable carbon-polymer composite, a current collector with a low sheet resistance of ≈2.7 Ω ...

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confidence: 89%

“…Since 2015, “water‐in‐salt” (WiS) aqueous electrolytes containing extremely concentrated lithium salt have been investigated . Some of these WiS‐based gel electrolytes have also been reported to show better safety and robustness compared with the conventional PGE . However, none of these materials exhibited mechanical stretchability.…”

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Fully Integrated Design of a Stretchable Solid‐State Lithium‐Ion Full Battery

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“…With growing requirement of cheapness and high security energy storage device for wearable and flexible electronics, [163][164][165][166][167][168][169][170] aqueous MZIBs have been regarded as a favorable choice because of high safety and environmental friendliness. To achieve stable electrochemical performance under various deformations, all parts of the battery should meet the required flexibility.…”

Section: Flexible Zibs Based On Manganese-based Cathode Materialsmentioning

confidence: 99%

Challenges and perspectives for manganese‐based oxides for advanced aqueous zinc‐ion batteries

Zhao

Zhu

Zhang

2019

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Li‐ion batteries (LIBs) with excellent cycling stability and high‐energy densities have already occupied the commercial rechargeable battery market. Unfortunately, the high cost and intrinsic insecurity induced by organic electrolyte severely hinder their applications in large‐scale energy storage. In contrast, aqueous Zn‐ion batteries (ZIBs) are being developed as an ideal candidate because of their cheapness and high security. Benefiting from high operating voltage and acceptable specific capacity, recently, manganese‐based oxides with different various crystal structures have been extensively studied as cathode materials for aqueous ZIBs. This review presents research progress of manganese‐based cathodes in aqueous ZIBs, including various manganese‐based oxides and their zinc storage mechanisms. In addition, we also discuss some optimization strategies that aim at improving the electrochemical performance of manganese‐based cathodes, and the design of flexible aqueous ZIBs based on manganese‐based cathodes (MZIBs). Finally, this review summarizes some valuable research directions, which will promote the further development of aqueous MZIBs.

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“…In order to address these issues, Dong et al utilized Li 1.1 Mn 2 O 4 (LMO) as cathode and carbon‐coated NASICON‐type LiTi 2 (PO 4 ) 3 (LTPO) as anode, respectively, to make aqueous lithium ion batteries. Yang et al developed a LIB containing LiVPO 4 F as both cathode and anode with a gel polymer electrolyte. In this case, the safety issues were circumvented by choosing appropriate electrodes.…”

Section: Device Advancesmentioning

confidence: 99%

Recent Advances in Fiber‐Shaped Supercapacitors and Lithium‐Ion Batteries

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Early attempts in wearable energy storage include mounting existing components on clothes or other accessories, [2] such as batteries and capacitors that are rigid and unwashable, and have hence limited the broad uptake of wearable technologies. To improve device flexibility, flexible functional components (e.g., electrodes, electrolytes, and current collectors) have been integrated into flexible films. However, these flexible devices have no or very low stretchability. In addition, the film-shaped substrates are often impermeable to air and/or moisture, vulnerable to twisting or wrapping, [3] and of low wear comfort. To address these issues, intense effort has recently been directed toward fiber-shaped energy storage devices (FSESDs), including fiber-shaped supercapacitors, and Li-ion batteries, by incorporating active materials into fibers, and then weaving or knitting these functional fibers into fabrics or textiles to make the devices air/moisture permeable. These fiber-shaped structures could allow for the preparation of multifunctional wearable devices by simply integrating fibers with different functions into the same fabric. [4] Therefore, FSESDs have attracted everincreasing interests worldwide, leading to a huge expansion of literature and the number of publications is still rapidly increasing every year.Although significant progress has been made in FSESDs, it remains a major challenge to make high-performance fibershaped devices at low cost. The small size and nonflat structure of fibers increases complexity in device manufacture while most existing FSESDs show inferior performance with respect to their planar counterparts. Furthermore, the operation environments for wearable electronics often require devices withstanding repeated squeezing or bending deformations caused by body movements, washing, and other operations, and hence the durability against wearing and washing is another critical issue facing wearable devices. Among various recently invented FSESDs, including supercapacitors, lithium-ion batteries, lithium-sulfur batteries, lithium-air batteries, zinc-air batteries, and aluminum-air batteries, fiber-shaped supercapacitors and lithium-ion batteries have been considered as the most promising candidate for practical applications in the near future. Herein, we present a focused and critical review of the recent advancements in fiber-shaped supercapacitors and lithium-ion batteries, along with current challenges and future opportunities for FSESDs.The rapid development in wearable electronics has spurred a great deal of interest in flexible energy storage devices, particularly fiber-shaped energy storage devices (FSESDs), such as fiber-shaped supercapacitors (FSSCs) and fiber-shaped batteries (FSBs). Depending on their electrode configurations, FSESDs can contain five differently structured electrodes, including parallel fiber electrodes (PFEs), twisted fiber electrodes (TFDs), wrapped fiber electrodes (WFEs), coaxial fiber devices (CFEs), and rolled electrodes (REs). Various rational method...

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Flexible Aqueous Li‐Ion Battery with High Energy and Power Densities

Cited by 180 publications

References 34 publications

Fully Integrated Design of a Stretchable Solid‐State Lithium‐Ion Full Battery

Fully Integrated Design of a Stretchable Solid‐State Lithium‐Ion Full Battery

Challenges and perspectives for manganese‐based oxides for advanced aqueous zinc‐ion batteries

Recent Advances in Fiber‐Shaped Supercapacitors and Lithium‐Ion Batteries

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