Electrochemical properties of a non-aqueous redox battery with all-organic redox couples

Park, Se-Kook; Shim, Jae Hyeok; Yang, Junghoon; Shin, Kyoung-Hee; Jin, Chang-Soo; Lee, Bum Suk; Lee, Young-Seak; Jeon, Jae-Deok

doi:10.1016/j.elecom.2015.07.013

Cited by 60 publications

(39 citation statements)

References 16 publications

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“…[9] Another encouraging research line is the substitution of aqueous electrolytes by non-aqueous electrolytes [10] or even ionic liquids, [11] which are more electrochemically stable and would allow achieving higher battery voltages and energy densities. [12,13] In the last few years, RFBs based on organic redox molecules, such as quinones, phenothiazine, nitroxides, viologens, and pyridines [14][15][16][17] have experienced a great deal of interest, becoming one of the hottest topics in electrochemical energy storage (see Table S1 in the Supporting Information). [18,19] Regardless of the chemical nature of the electroactive species and the type of electrolytes, most RFBs rely on ion-selective membranes to separate the two redox electrolytes and to prevent the crossover of active compounds while allowing the migration of charge carriers.…”

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confidence: 99%

“…Before analyzing the origin of battery fading, we assembled a similar battery but employing more concentrated redox electrolytes; 0.1m H 2 Q in 0.1m HCl for the catholyte and 0.1m pBQ in PYR 14 TFSI for the anolyte. The higher concentration of the active species causes an improvement in the discharge capacity reaching 90 % of the theoretical one at the lowest current density (Figure 4 a).…”

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A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

et al. 2017

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Flexible and scalable energy storage solutions are necessary for mitigating fluctuations of renewable energy sources. The main advantage of redox flow batteries is their ability to decouple power and energy. However, they present some limitations including poor performance, short‐lifetimes, and expensive ion‐selective membranes as well as high price, toxicity, and scarcity of vanadium compounds. We report a membrane‐free battery that relies on the immiscibility of redox electrolytes and where vanadium is replaced by organic molecules. We show that the biphasic system formed by one acidic solution and one ionic liquid, both containing quinoyl species, behaves as a reversible battery without any membrane. This proof‐of‐concept of a membrane‐free battery has an open circuit voltage of 1.4 V with a high theoretical energy density of 22.5 Wh L−1, and is able to deliver 90 % of its theoretical capacity while showing excellent long‐term performance (coulombic efficiency of 100 % and energy efficiency of 70 %).

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A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

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“…Thepeak current shows agood linear response to the square root of the sweep rates (Supporting Information, Figure S1b). [14] According to the Randles-Sevcik equation, the diffusion coefficient of Fe 2+ (Gly) 2 (the complex of iron ions and glycine) was estimated to be about 1.85 10 À5 cm 2 s À1 and that of Fe 3+ (Gly) 2 was 2.05 10 À5 cm 2 s À1 ,w hich is somewhat higher than the experimentally evaluated diffusion coefficient. [13] Thed iffusion coefficient of Fe 3+ was about 2.13 10 À5 cm 2 s À1 and that of Fe 2+ was about 2.89 10 À5 cm 2 s À1 , based on the same method (Supporting Information, Figure S1c,d).…”

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A Low‐Cost Neutral Zinc–Iron Flow Battery with High Energy Density for Stationary Energy Storage

et al. 2017

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Flow batteries (FBs) are one of the most promising stationary energy-storage devices for storing renewable energy. However, commercial progress of FBs is limited by their high cost and low energy density. A neutral zinc-iron FB with very low cost and high energy density is presented. By using highly soluble FeCl /ZnBr species, a charge energy density of 56.30 Wh L can be achieved. DFT calculations demonstrated that glycine can combine with iron to suppress hydrolysis and crossover of Fe /Fe . The results indicated that an energy efficiency of 86.66 % can be obtained at 40 mA cm and the battery can run stably for more than 100 cycles. Furthermore, a low-cost porous membrane was employed to lower the capital cost to less than $ 50 per kWh, which was the lowest value that has ever been reported. Combining the features of low cost, high energy density and high energy efficiency, the neutral zinc-iron FB is a promising candidate for stationary energy-storage applications.

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“…+0.3 V vs. Ag) and its chemical stability [188]. For these reasons, another TEMPO-based non-aqueous system has been proposed by Park and co-workers [189]. In this system camphoquinone and oxo-TEMPO were used at the negative and positive electrodes, respectively, resulting in an open-circuit voltage of up to 2.12 V, compared to ca.…”

Section: Camphoquinone-oxo-tempo Redox Flow Batterymentioning

confidence: 99%

Recent developments in organic redox flow batteries: A critical review

Leung

Shah

Sanz

et al. 2017

Journal of Power Sources

444

318

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Redox flow batteries (RFBs) have emerged as prime candidates for energy storage on the medium and large scales, particularly at the grid scale. The demand for versatile energy storage continues to increase as more electrical energy is generated from intermittent renewable sources. A major barrier in the way of broad deployment and deep market penetration is the use of expensive metals as the active species in the electrolytes. The use of organic redox couples in aqueous or nonaqueous electrolytes is a promising approach to reducing the overall cost in long-term, since these materials are low-cost and abundant. The performance of such redox couples can be tuned by modifying their chemical structure. In recent years, significant developments in organic redox flow batteries has taken place, with the introduction of new groups of highly soluble organic molecules, capable of providing a cell voltage and charge capacity comparable to conventional metal-based systems. This review summarises the fundamental developments and characterization of organic redox flow batteries from both the chemistry and materials perspectives. The latest advances, future challenges and opportunities for further development are discussed. Metal deposition or anode in one half-celli.e. Lithium/ organic hybrid FB Metal 'This review'

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Electrochemical properties of a non-aqueous redox battery with all-organic redox couples

Cited by 60 publications

References 16 publications

A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

A Low‐Cost Neutral Zinc–Iron Flow Battery with High Energy Density for Stationary Energy Storage

Recent developments in organic redox flow batteries: A critical review

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