Reverse Dual-Ion Battery via a ZnCl<sub>2</sub> Water-in-Salt Electrolyte

Wei, Xian‐Yong; Xu, Yingjie; Zhang, Chong; Leonard, Daniel P.; Markir, Aaron; Lü, Jun; Ji, Xiulei

doi:10.1021/jacs.9b00617

Cited by 397 publications

(291 citation statements)

References 48 publications

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“…[ 6 ] Ion‐conductive polymer electrolytes can effectively restrain the growth of Zn dendrites and alleviate the dissolution of active materials owing to their limited water content. [ 7 ] A kind of “water‐in‐salt” ultrahigh concentration electrolyte of 1 m Zn(TFSI) 2 + 20 m LiTFSI was designed to reduce the H 2 O molecules that surround Zn 2+ , wherefore it could effectively suppress the Zn dendrites and side reactions, [ 8 ] which was also achieved by using ZnCl 2 ·2.33H 2 O, [ 9 ] 30 m ZnCl 2 , [ 10 ] Zn(CF 3 SO 3 ) 2 , [ 11 ] “water‐in‐deep eutectic solvent” of urea electrolyte. [ 12 ] In other words, the much strong and tight solvation sheath of Zn 2+ was effectively decreased in the vicinity of Zn metal, and thus water‐induced side reaction and formation of Zn hydroxides were basically inhibited.…”

Section: Introductionmentioning

confidence: 99%

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

Deng

Xie

Han

et al. 2020

Adv Funct Materials

524

363

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Zinc metal is considered as one of the best anode choices for rechargeable aqueous Zn-based batteries due to its high specific capacity, abundance, and safety. However, dendrite and corrosion issues remain a challenge for this system. Herein, sieve-element function (selective channel of Zn 2+ ) and uniform-pore distribution (≈3.0 nm) of a kaolin-coated Zn anode (KL-Zn) is proposed to alleviate these problems. Based on the artificial Zn metal/electrolyte interface, the KL-Zn anode not only ensures dendritefree deposition and long-time stability (800 h at 1.1 mA h cm −2 ), but also retards side reactions. As a consequence, KL-Zn/MnO 2 batteries can deliver high specific capacity and good capacity retention as well as a reasonably well-preserved morphology (KL-Zn) after 600 cycles at 0.5 A g −1 . This work provides a deep step toward high-performance rechargeable Zn-based battery system.

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Section: Introductionmentioning

confidence: 99%

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

Deng

Xie

Han

et al. 2020

Adv Funct Materials

524

363

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“…[17][18][19][20][21] The reaction takes place at the Zn anode and can be regarded as a typical plating-stripping process. [26][27][28] However, costly salts used in "water in salt" and incompatibility with hydrogels of the zinc molten hydrate compromise any benefits anticipated for hydrogel based aqueous batteries in practical applications, such as low cost and excellent mechanical durability. As a result, Zn(OH) 2 , ZnO, and zincates are likely to form during plating-stripping cycles.…”

Section: Introductionmentioning

confidence: 99%

Antifreezing Hydrogel with High Zinc Reversibility for Flexible and Durable Aqueous Batteries by Cooperative Hydrated Cations

Zhu

Wang

Hong-mei

et al. 2019

Adv Funct Materials

236

167

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Hydrogels are widely used in flexible aqueous batteries due to their liquid-like ion transportation abilities and solid-like mechanical properties. Their potential applications in flexible and wearable electronics introduce a fundamental challenge: how to lower the freezing point of hydrogels to preserve these merits without sacrificing hydrogels' basic advantages in low cost and high safety. Moreover, zinc as an ideal anode in aqueous batteries suffers from low reversibility because of the formation of insulative byproducts, which is mainly caused by hydrogen evolution via extensive hydration of zinc ions. This, in principle, requires the suppression of hydration, which induces an undesirable increase in the freezing point of hydrogels. Here, it is demonstrated that cooperatively hydrated cations, zinc and lithium ions in hydrogels, are very effective in addressing the above challenges. This simple but unique hydrogel not only enables a 98% capacity retention upon cooling down to −20 °C from room temperature but also allows a near 100% capacity retention with >99.5% Coulombic efficiency over 500 cycles at −20 °C. In addition, the strengthened mechanical properties of the hydrogel under subzero temperatures result in excellent durability under various harsh deformations after the freezing process.

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“…At present, WiS electrolytes have already been successfully applied to supercapacitors and metal ion batteries to improve their safety. [ 28–32 ] However, the reported WiS and its derivatives with extended working voltage window still cannot meet the requirements for high working voltage DIBs due to the unique anion insertion mechanism. Therefore, matching appropriate electrolytes and electrodes that can fully support the operation of DIBs in a safe manner is fundamentally important to facilitate the practical application of the related batteries.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Aqueous/Nonaqueous Water‐in‐Bisalt Electrolyte Enables Safe Dual Ion Batteries

Zhu

et al. 2020

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.201905838. Recently, a new class of aqueous electrolytes named "waterin-salt (WiS)" formulated with superconcentrated lithium salts Dual ion batteries (DIBs) have recently attracted ever-increasing attention owing to the potential advantages of low material cost and good environmental friendliness. However, the potential safety hazards, cost, and environmental concerns mainly resulted from the commonly used nonaqueous organic solvents severely hinder the practical application of DIBs. Herein, a hybrid aqueous/nonaqueous water-in-bisalt electrolyte with both broad electrochemical stability window and excellent safety performance is developed. The lithium-based DIB assembled using KS6 graphite and niobium pentoxide as the active materials in the cathode and anode exhibits good comprehensive performance including capacity, cycling stability, rate performance, and medium discharge voltage. Initial capacities of ≈47.6 and 29.6 mAh g −1 retention after 300 cycles can be delivered with a medium discharge voltage of around 2.2 V in the voltage window of 0-3.2 V at the current density of 200 mA g −1 . Good rate performance for the battery can be indicated by 29.7 mAh g −1 discharge capacity retention at 400 mA g −1 . It is noteworthy that the coulombic efficiency of the battery can reach as high as 93.9%, which is comparable to that of the corresponding DIBs using nonaqueous organic electrolytes.www.advancedsciencenews.com

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Reverse Dual-Ion Battery via a ZnCl₂ Water-in-Salt Electrolyte

Cited by 397 publications

References 48 publications

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

Antifreezing Hydrogel with High Zinc Reversibility for Flexible and Durable Aqueous Batteries by Cooperative Hydrated Cations

Hybrid Aqueous/Nonaqueous Water‐in‐Bisalt Electrolyte Enables Safe Dual Ion Batteries

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Reverse Dual-Ion Battery via a ZnCl2 Water-in-Salt Electrolyte

Cited by 397 publications

References 48 publications

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode

Antifreezing Hydrogel with High Zinc Reversibility for Flexible and Durable Aqueous Batteries by Cooperative Hydrated Cations

Hybrid Aqueous/Nonaqueous Water‐in‐Bisalt Electrolyte Enables Safe Dual Ion Batteries

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Reverse Dual-Ion Battery via a ZnCl₂ Water-in-Salt Electrolyte