2.5 V High‐Performance Aqueous and Semi‐Solid‐State Symmetric Supercapacitors Enabled by 3 m Sulfolane‐Saturated Aqueous Electrolytes

Cheng, Xiaolin; Yuan, Jingchao; Hu, Jiaqi; Chen, Shuangqiang; Yan, Hao; Yang, Weijing; Li, Wenrong; Dai, Yang

doi:10.1002/ente.202200157

Cited by 2 publications

(2 citation statements)

References 25 publications

(50 reference statements)

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“…Recently, in the design of dilute-salt aqueous electrolytes, aqueous-nonaqueous hybrid solvents were reported for Li-ion batteries, where a portion of the water was substituted by organics, including polyethylene glycol (PEG) 26 and sulfolane 27 – 29 . Similar concepts were then applied to ZMBs 12 , 30 – 37 .…”

Section: Introductionmentioning

confidence: 99%

Enabling selective zinc-ion intercalation by a eutectic electrolyte for practical anodeless zinc batteries

et al. 2023

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Two major challenges hinder the advance of aqueous zinc metal batteries for sustainable stationary storage: (1) achieving predominant Zn-ion (de)intercalation at the oxide cathode by suppressing adventitious proton co-intercalation and dissolution, and (2) simultaneously overcoming Zn dendrite growth at the anode that triggers parasitic electrolyte reactions. Here, we reveal the competition between Zn2+vs proton intercalation chemistry of a typical oxide cathode using ex-situ/operando techniques, and alleviate side reactions by developing a cost-effective and non-flammable hybrid eutectic electrolyte. A fully hydrated Zn2+ solvation structure facilitates fast charge transfer at the solid/electrolyte interface, enabling dendrite-free Zn plating/stripping with a remarkably high average coulombic efficiency of 99.8% at commercially relevant areal capacities of 4 mAh cm−2 and function up to 1600 h at 8 mAh cm−2. By concurrently stabilizing Zn redox at both electrodes, we achieve a new benchmark in Zn-ion battery performance of 4 mAh cm−2 anode-free cells that retain 85% capacity over 100 cycles at 25 °C. Using this eutectic-design electrolyte, Zn | |Iodine full cells are further realized with 86% capacity retention over 2500 cycles. The approach represents a new avenue for long-duration energy storage.

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Section: Introductionmentioning

confidence: 99%

Enabling selective zinc-ion intercalation by a eutectic electrolyte for practical anodeless zinc batteries

et al. 2023

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“…Organic electrolyte SCs have a wider potential window due to the intrinsic electrochemical resilience of organic solvents, which allows them to sustain greater voltages without electrolyte degradation [ 22 , 23 , 24 , 25 ]. Different solvents were examined in this context including methoxy acetonitrile [ 26 ], g-butyrolactone [ 27 ], sulfolane [ 28 ], and methoxy propionitrile [ 29 ]. The solvents with flash points greater than 30 °C, such as methoxy propionitrile and methoxy acetonitrile, have greater electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Improving the Energy Storage of Supercapattery Devices through Electrolyte Optimization for Mg(NbAgS)x(SO4)y Electrode Materials

et al. 2023

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Electrolytes are one of the most influential aspects determining the efficiency of electrochemical supercapacitors. Therefore, in this paper, we investigate the effect of introducing co-solvents of ester into ethylene carbonate (EC). The use of ester co-solvents in ethylene carbonate (EC) as an electrolyte for supercapacitors improves conductivity, electrochemical properties, and stability, allowing greater energy storage capacity and increased device durability. We synthesized extremely thin nanosheets of niobium silver sulfide using a hydrothermal process and mixed them with magnesium sulfate in different wt% ratios to produce Mg(NbAgS)x)(SO4)y. The synergistic effect of MgSO4 and NbS2 increased the storage capacity and energy density of the supercapattery. Multivalent ion storage in Mg(NbAgS)x(SO4)y enables the storage of a number of ions. The Mg(NbAgS)x)(SO4)y was directly deposited on a nickel foam substrate using a simple and innovative electrodeposition approach. The synthesized silver Mg(NbAgS)x)(SO4)y provided a maximum specific capacity of 2087 C/g at 2.0 A/g current density because of its substantial electrochemically active surface area and linked nanosheet channels which aid in ion transportation. The supercapattery was designed with Mg(NbAgS)x)(SO4)y and activated carbon (AC) achieved a high energy density of 79 Wh/kg in addition to its high power density of 420 W/kg. The supercapattery (Mg(NbAgS)x)(SO4)y//AC) was subjected to 15,000 consecutive cycles. The Coulombic efficiency of the device was 81% after 15,000 consecutive cycles while retaining a 78% capacity retention. This study reveals that the use of this novel electrode material (Mg(NbAgS)x(SO4)y) in ester-based electrolytes has great potential in supercapattery applications.

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2.5 V High‐Performance Aqueous and Semi‐Solid‐State Symmetric Supercapacitors Enabled by 3 m Sulfolane‐Saturated Aqueous Electrolytes

Cited by 2 publications

References 25 publications

Enabling selective zinc-ion intercalation by a eutectic electrolyte for practical anodeless zinc batteries

Enabling selective zinc-ion intercalation by a eutectic electrolyte for practical anodeless zinc batteries

Improving the Energy Storage of Supercapattery Devices through Electrolyte Optimization for Mg(NbAgS)x(SO4)y Electrode Materials

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