Role of solvents on the oxygen reduction and evolution of rechargeable Li-O2 battery

Christy, Maria; Arul, Anupriya; Zahoor, Awan; Moon, Kwang Uk; Oh, Min; Stephan, A. Manuel; Nahm, Kee Suk

doi:10.1016/j.jpowsour.2016.12.119

Cited by 35 publications

(36 citation statements)

References 50 publications

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“…This may be attributed to the improvement of oxygen solubility of electrolyte by the addition of DMSO. [ 30 ] Moreover, the OHE‐based ZAB exhibits a narrow voltage gap between the charge and discharge curves compared with HE‐based ZAB (Figure 4b). Figure 4c displays that the decrease of discharge plateaus of OHE‐based ZAB is only 0.15 V, from 1.21 V at 0.5 mA cm −2 to 1.06 V at 10 mA cm −2 , which is remarkably lower than those of HE‐based ZAB.…”

Section: Resultsmentioning

confidence: 99%

Flexible Zinc–Air Battery with High Energy Efficiency and Freezing Tolerance Enabled by DMSO‐Based Organohydrogel Electrolyte

Jiang

Wang

et al. 2021

Small Methods

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With the emergence of various flexible electronics, the flexible zinc–air battery (ZAB) is considered a promising energy source with low cost, high energy density, and safety. However, gel electrolytes that improve the freezing tolerance and energy efficiency of ZABs are rarely explored. Herein, an organohydrogel electrolyte (OHE) is fabricated by soaking poly(2‐acrylamido‐2‐methylpropanesulfonic acid)/polyacrylamide (PAMPS/PAAm) double‐network hydrogel in aqueous KOH electrolyte with dimethyl sulfoxide (DMSO) additive. The prepared OHE exhibits high mechanical strength and excellent ionic conductivity. In addition, the introduction of DMSO effectively improves freezing tolerance and electrochemical performance especially in energy efficiency of ZABs due to that DMSO can break the hydrogen bonds between water molecules and alter the path of the conventional oxygen evolution reaction in ZAB simultaneously. Compared with the control hydrogel electrolyte, the optimized OHE enables flexible ZABs to not only exhibit an exceptionally low charge voltage of 1.63 V, high energy efficiency of 74.2%, and long cycling life of 177 cycles, but also to operate with an excellent specific capacity of 562 mAh g−1 and energy density of 523.4 Wh kg−1 at −40 °C. Moreover, the obtained flexible ZABs keep a stable output under deformations and extreme low temperature, manifesting a great potential for functional wearable devices.

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Section: Resultsmentioning

confidence: 99%

Flexible Zinc–Air Battery with High Energy Efficiency and Freezing Tolerance Enabled by DMSO‐Based Organohydrogel Electrolyte

Jiang

Wang

et al. 2021

Small Methods

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“…TEGDME has been chosen as the representative solvent due to its acceptable stability in Li–O 2 battery, good compatibility with Li metal and intermediate value of the Gutmann donor number (16.6 kcal mol −1 ) that is known to be a major solvent property influencing the ORR and OER mechanisms. [ 10 ] The configuration of a typical Li–O 2 coin cell is schematically shown in Figure a and the detailed cell‐assembly procedure is provided in the Supporting information Experimental section.…”

Section: Resultsmentioning

confidence: 99%

Quantitative Delineation of the Low Energy Decomposition Pathway for Lithium Peroxide in Lithium–Oxygen Battery

et al. 2020

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Identification of a low-potential decomposition pathway for lithium peroxide (Li 2 O 2) in nonaqueous lithium-oxygen (Li-O 2) battery is urgently needed to ameliorate its poor energy efficiency. In this study, experimental data and theoretical calculations demonstrate that the recharge overpotential (RC) of Li-O 2 battery is fundamentally dependent on the Li 2 O 2 crystallization pathway which is intrinsically related to the microscopic structural properties of the growing crystals during discharge. The Li 2 O 2 grown by concurrent surface reduction and chemical disproportionation seems to form two discrete phases that have been deconvoluted and the amount of Li 2 O 2 deposited by these two routes is quantitatively estimated. Systematic analyses have demonstrated that, regardless of the bulk morphology, solution-grown Li 2 O 2 shows higher RC (>1 V) which can be attributed to higher structural order in the crystal compared to the surface-grown Li 2 O 2. Presumably due to a cohesive interaction between the electrode surface and growing crystals, the surface-grown Li 2 O 2 seems to possess microscopic structural disorder that facilitates a delithiation induced partial solution-phase oxidation at lower RC (<0.5 V). This difference in RC for differently grown Li 2 O 2 provides crucial insights into necessary control over Li 2 O 2 crystallization pathways to improve the energy efficiency of a Li-O 2 battery.

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“…However, it was too close to the electrochemical stability window of the electrolyte, and the irreversible redox behavior was dominant ( Figure S6, Supporting Information). The oxidation potential of the TEGDME solvent is known to be around 4.20-4.30 V versus Li/Li + , [28][29][30] and if we assume the voltage gap between the first and second redox reactions is similar in both EC/DMC and TEGDME electrolytes, the second redox potential of PXZ and PTZ derivatives are expected to be over 4.20 V versus Li/ Li + in TEGDME electrolytes. It indicates that the second redox reaction of PXZ and PTZ derivatives in TEGDME electrolytes is likely to substantially overlap with the oxidation of electrolytes, which would induce the irreversible reactions in TEGDME electrolytes.…”

Section: [ ] Anion [ ] Anionmentioning

confidence: 99%

Utilizing Latent Multi‐Redox Activity of p‐Type Organic Cathode Materials toward High Energy Density Lithium‐Organic Batteries

Lee

et al. 2020

Advanced Energy Materials

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Organic electrode materials hold great potential due to their cost‐efficiency, eco‐friendliness, and possibly high theoretical capacity. Nevertheless, most organic cathode materials exhibit a trade‐off relationship between the specific capacity and the voltage, failing to deliver high energy density. Herein, it is shown that the trade‐off can be mitigated by utilizing the multi‐redox capability of p‐type electrodes, which can significantly increase the specific capacity within a high‐voltage region. The molecular structure of 5,10‐dihydro‐5,10‐dimethylphenazine is modified to yield a series of phenoxazine and phenothiazine derivatives with elevated redox potentials by substitutions. Subsequently, the feasibility of the multi‐redox capability is scrutinized for these high‐voltage p‐type organic cathodes, achieving one of the highest energy densities. It is revealed that the seemingly impractical second redox reaction is indeed dependent on the choice of the electrolyte and can be reversibly realized by tailoring the donor number and the salt concentration of the electrolyte, which places the voltage of the multi‐redox reaction within the electrochemical stability window. The results demonstrate that high‐energy‐density organic cathodes can be practically achieved by rational design of multi‐redox p‐type organic electrode materials and the compatibility consideration of the electrolyte, opening up a new avenue toward advanced organic rechargeable batteries.

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Role of solvents on the oxygen reduction and evolution of rechargeable Li-O2 battery

Cited by 35 publications

References 50 publications

Flexible Zinc–Air Battery with High Energy Efficiency and Freezing Tolerance Enabled by DMSO‐Based Organohydrogel Electrolyte

Flexible Zinc–Air Battery with High Energy Efficiency and Freezing Tolerance Enabled by DMSO‐Based Organohydrogel Electrolyte

Quantitative Delineation of the Low Energy Decomposition Pathway for Lithium Peroxide in Lithium–Oxygen Battery

Utilizing Latent Multi‐Redox Activity of p‐Type Organic Cathode Materials toward High Energy Density Lithium‐Organic Batteries

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