Diffusion-determined assembly of all-climate supercapacitors <i>via</i> bioinspired aligned gels

Zhou, Jie; Wu, Dong; Wu, Chuhan; Wei, Gumi; Wei, Junjie; Tai, Ziyang; Xi, Songyan; Shen, Saiji

doi:10.1039/c9ta06880e

Cited by 25 publications

(14 citation statements)

References 44 publications

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“…As the temperature gradually increases from 0 to 60°C, the capacitance values for the devices present a tendency to enhance (Fig. 6h) [53,54]. The device capacitance at 60°C can reach 185% of that at 0°C because of improved interface kinetics and enhanced ionic conductivity.…”

Section: Resultsmentioning

confidence: 96%

Microzone-explosion synthesis of porous carbon electrodes for advanced aqueous solid-state supercapacitors with a high-voltage gel electrolyte

Liu

Cui

et al. 2021

Journal of Energy Chemistry

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Section: Resultsmentioning

confidence: 96%

Microzone-explosion synthesis of porous carbon electrodes for advanced aqueous solid-state supercapacitors with a high-voltage gel electrolyte

Liu

Cui

et al. 2021

Journal of Energy Chemistry

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“…WIS-type electrolytes designed to date for SCs have typically performed well at either subzero temperatures , or pseudo-high temperatures, , but only some of them operated within a wide range, at both low and pseudo-high temperatures. ,− Based on the increased interest in developing electrolytes for SCs capable of working across extreme ambient temperatures, we assessed the performance of AEIS electrolytes by carrying out a second set of CV curves at 65, 45, 5, −15, and −35 °C (Figure , Tables S4 and S5). It is worth noting that specific capacitances ranging from ca.…”

Section: Resultsmentioning

confidence: 99%

Aqueous-Eutectic-in-Salt Electrolytes for High-Energy-Density Supercapacitors with an Operational Temperature Window of 100 °C, from −35 to +65 °C

Riobóo

Leech

et al. 2020

ACS Appl. Mater. Interfaces

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Water-in-salt (WIS) electrolytes are gaining increased interest as an alternative to conventional aqueous or organic ones. WIS electrolytes offer an interesting combination of safety, thanks to their aqueous character, and extended electrochemical stability window, thanks to the strong coordination between water molecules and ion salt. Nonetheless, cost, the tendency of salt precipitation, and sluggish ionic transfer leading to poor rate performance of devices are some intrinsic drawbacks of WIS electrolytes that yet need to be addressed for their technological implementation. It is worth noting that the absence of "free'' water molecules could also be achieved via the addition of a certain cosolvent capable of coordinating with water. This is the case of the eutectic mixture formed between DMSO and H 2 O with a molar ratio of 1:2 and a melting point as low as −140 °C. Interestingly, addition of salts at near-saturation conditions also resulted in an increase of the boiling point of the resulting solution. Herein, we used a eutectic mixture of DMSO and H 2 O for dissolution of LiTFSI in the 1.1−8.8 molality range. The resulting electrolyte (e.g., the so-called aqueous-eutectic-in-salt) exhibited excellent energy and power densities when operating in a supercapacitor cell over a wide range of extreme ambient temperatures, from as low as −35 °C to as high as +65 °C.

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“…As shown in Figure c,d, the high degree of maintenance of the rectangular shape of the CV curves and the good symmetry of galvanostatic charge and discharge under different voltage windows prove the wide working voltage and outstanding capacitive behavior of HPC//HPC assembled with organic electrolyte (TEABF 4 ). Currently, most reported TEABF 4 -based electrolytes using propylene carbonate or acetonitrile as solvent usually work in the voltage window of 2.0–3.0 V (e.g., 2.0 V, 2.5 V, , 2.7 V, , and 3.0 V) . The exorbitant charge potential usually leads to the decomposition of electrolyte and leads to the polarization phenomenon.…”

Section: Resultsmentioning

confidence: 99%

Template-Directing Coupled with Chemical Activation Methodology-Derived Hexagon-like Porous Carbon Electrode with Outstanding Compatibility to Electrolytes and Low-Temperature Performance

Cao

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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The conversion of asphalt into hexagon-like porous carbon (HPC) with a micro-mesoporous structure is realized by the coupling of template-directing and chemical activation methodologies. The specific surface area of HPC can reach up to 1356 m2 g–1 even at such a low-proportioned dosage of activator (0.5-fold) and is also larger than those of template-directed carbon and activation-derived carbon, as it benefited from the coupling merits of template-directing and chemical activation. Excellent capacitive-energy-storage behavior with respect to rate capability, capacitance retention, and durability are delivered by HPC//HPC symmetric supercapacitors assembled with aqueous and organic electrolytes. This great compatibility for different kinds of electrolytes and electrode properties is owed to the robust hexagon-like microarchitecture feature associated with hierarchical pore structure, which not only hinders the stacking between each other but also provides a buffer function for the volume variation and sufficient active sites for the storage of electrolyte ions. The drastic temperature variation has almost no influence on the diffusion and transfer rate of electrolyte ions, further evidencing the advanced feature of the hierarchical pore structure. Additionally, HPC//Li4Ti5O12 LIC assembled with the Li-based electrolyte also presents a superior Ragone performance. The coexistence of micro- and mesopores for the HPC makes it an attractive electrode material for various capacitive-energy-storage devices. This work provides a promising way to realize the plasticity of pore channels and mass production of high capacitive storage ability of electrode material via the combination of template-directing and chemical activation strategies.

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Diffusion-determined assembly of all-climate supercapacitors via bioinspired aligned gels

Abstract: Inspired by nature, we introduce superconcentrated LiTFSI solution into aligned polymer networks. These well-designed supercapacitors exhibit all-climate capacitance from −54 to 100 °C and maintain stable performance under consecutive bending conditions.

Cited by 25 publications

References 44 publications

Microzone-explosion synthesis of porous carbon electrodes for advanced aqueous solid-state supercapacitors with a high-voltage gel electrolyte

Microzone-explosion synthesis of porous carbon electrodes for advanced aqueous solid-state supercapacitors with a high-voltage gel electrolyte

Aqueous-Eutectic-in-Salt Electrolytes for High-Energy-Density Supercapacitors with an Operational Temperature Window of 100 °C, from −35 to +65 °C

Template-Directing Coupled with Chemical Activation Methodology-Derived Hexagon-like Porous Carbon Electrode with Outstanding Compatibility to Electrolytes and Low-Temperature Performance

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