Zn anode sustaining high rate and high loading in organic electrolyte for rechargeable batteries

Raza, Bareera; Naveed, Ahmad; Chen, Jiahang; Lu, Huiqing; Rasheed, Tahir; Yang, Jun; Nuli, Yanna; Wang, Jiulin

doi:10.1016/j.ensm.2022.01.043

Cited by 36 publications

(18 citation statements)

References 42 publications

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“…Undoubtedly, the CPE strategy shows a remarkable improvement and surpasses the performance of Zn//Cu cells in the latest reported works (Table S2, Supporting Information). [26][27][28][29][30][31][32][33][34][35][36][37][38][39] To demonstrate the feasibility and efficiency of the CPE in full cell, NVO nanofibers are used as the cathodes to pair with Zn metal anodes. [40] The Zn//NVO full cell demonstrates nearly no capacity decay over 5000 cycles at a high rate of 5 A g −1 as shown in Figure 5f, featuring decent capacity ≈100 mAh g −1 and CE of >99%.…”

Section: Efficacy Of the Designed Cpementioning

confidence: 99%

Diminishing Interfacial Turbulence by Colloid‐Polymer Electrolyte to Stabilize Zinc Ion Flux for Deep‐Cycling Zn Metal Batteries

et al. 2022

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volumetric capacity of 5855 mAh cm −3 ) of metallic Zn. [1] However, nonuniform Zn deposition aggravates formation of dendrites and leads to a low Coulombic efficiency (CE), resulting in battery performance deterioration. It is believed that regulated Zn 2+ distribution is beneficial to the uniform Zn plating. [1,2] Many works in the field of Zn anode realize uniform Zn 2+ distribution and improve Zn electrochemistry by constructing efficient Zn 2+ transport path. [1][2][3] However, we find that at deep cycling (high current densities and capacities), the interfacial turbulence is a severe problem that cannot be ignored to destroy the stability of Zn 2+ transport path. In details, the Zn 2+ ions flux distribution is affected by two factors: construction and stabilization of Zn 2+ transport path. Homogeneous Zn 2+ channels are helpful to realize uniform ion flux distribution; while Zn 2+ transport path would be destructed due to inevitable severe interfacial turbulence caused by fluidity of electrolyte and undesired H 2 evolution reaction (HER), which would lead to the disturbance of ion flux and uneven Zn deposition. In addition, the HER is usually accompanied by metal corrosion. [3] This not only consumes water in the electrolyte, but also the generated H 2 would result in swelling of the cell and even cell rupture. Meanwhile, the consumption of H + in water results in the accumulation of residual OH − ions, driving the corrosion reaction to form inactive Zn 4 SO 4 (OH) 6 •xH 2 O byproducts. [4,5] Moreover, the operation of ZMBs with high capacities is limited owing to the incomplete Zn discharging process because accumulated Zn leads to increased polarization of the battery; High current density can also cause an inhomogeneous electric field, incomplete metal stripping, and excessive polarization especially current and concentration polarization. [6,7] These issues can cause more serious interfacial instability and disturbance for deep-cycling batteries with high areal capacities and high current densities, significantly undermining the performance of ZMBs and plaguing their scale-up implementation. Aqueous deeply rechargeable Zn metal electrodes can only be achieved when the interfacial turbulence is rectified. Considering that free water molecules in electrolytes induce H 2 evolution and interfacial corrosion, highly concentrated The fluidity of aqueous electrolytes and undesired H 2 evolution reaction (HER) can cause severe interfacial turbulence in aqueous Zn metal batteries (ZMBs) at deep cycling with high capacities and current densities, which would further perturb ion flux and aggravate Zn dendrite growth. In this study, a colloid-polymer electrolyte (CPE) with special colloidal phase and suppressed HER is designed to diminish interfacial turbulence and boost deep Zn electrochemistry. Density functional theory calculations confirm that the quantitative migratory barriers of Zn 2+ along the transport pathway in CPE demonstrate much smaller fluctuations compared with normal aqueous electrolyte, indicating...

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Section: Efficacy Of the Designed Cpementioning

confidence: 99%

Diminishing Interfacial Turbulence by Colloid‐Polymer Electrolyte to Stabilize Zinc Ion Flux for Deep‐Cycling Zn Metal Batteries

et al. 2022

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“…For the 1 m Zn(TFA) 2 -AN electrolyte, the upper voltage limit at 0.05 mA·cm –2 is 2.22 V (Figure S6). The oxidation limit is affordable for most reported cathode materials (≤2.20 V). − The Zn(TFA) 2 -TEP electrolyte displays negligible oxidation current until 2.30 V. The oxidation current slightly decreases with the increase of TEP contents in the electrolytes. The suppressed decomposition of TFA – in the TEP electrolyte is assigned to the formation of ion pairs or aggregates.…”

Section: Resultsmentioning

confidence: 98%

Constructing Nonaqueous Rechargeable Zinc-Ion Batteries with Zinc Trifluoroacetate

Zou

Sun

et al. 2022

ACS Appl. Energy Mater.

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Rechargeable zinc-ion batteries (RZIBs) are recognized as promising alternative energy storage techniques for large-scale application. Using organic electrolytes with wide electrochemical stability windows to construct nonaqueous RZIBs enables high operating voltage and energy density. However, the selection of zinc salts with cost-effectiveness and excellent electrochemical performance for nonaqueous electrolytes is limited. In this work, the electrochemical properties of a competitive zinc salt, zinc trifluoroacetate (Zn(TFA)2), are investigated in acetonitrile and triethyl phosphate. It is found that the Zn(TFA)2 is highly soluble in the organic solvents, reaching 15 mol·kg–1 in acetonitrile. The Zn(TFA)2 electrolytes show a wide electrochemical stability window of 2.2 V, good conductivity of 6.14 mS·cm–1 at 1.0 mol·kg–1, and good compatibility with the Zn metal anode. Zn(TFA)2 tends to form ion pairs or aggregates in triethyl phosphate, which improve the electrochemical stability but partially expense the ionic conductivity. Full batteries are fabricated with the Zn(TFA)2 electrolytes using potassium manganese hexacyanoferrate as the cathode. The batteries with Zn(TFA)2-AN-TEP (19%) electrolyte deliver a high specific density of 181.9 Wh·kg–1 at 0.1 A·g–1 and excellent cyclic stability with a capacity retention rate of 71.7% after 1000 cycles at 0.5 A·g–1. Our results suggest that the Zn(TFA)2 is a promising candidate of zinc salts in the application of nonaqueous RZIBs.

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“…Due to the effect of many parameters, such as temperature, electrode surface roughness, applied voltage, and electrolyte content, HER is considered a complex process. 57 In mild acidic electrolytes, the reaction formula is shown below:Zn 2+ + 2e − ↔ Zn −0.76 V vs. SHE2H + + 2e − ↔ H 2 0 V vs. SHE…”

Section: Current Challenges Of Rechargeable Zn Anodesmentioning

confidence: 99%

Recent advances of organic polymers for zinc-ion batteries

Wang

et al. 2022

Sustainable Energy Fuels

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Zn anode sustaining high rate and high loading in organic electrolyte for rechargeable batteries

Cited by 36 publications

References 42 publications

Diminishing Interfacial Turbulence by Colloid‐Polymer Electrolyte to Stabilize Zinc Ion Flux for Deep‐Cycling Zn Metal Batteries

Diminishing Interfacial Turbulence by Colloid‐Polymer Electrolyte to Stabilize Zinc Ion Flux for Deep‐Cycling Zn Metal Batteries

Constructing Nonaqueous Rechargeable Zinc-Ion Batteries with Zinc Trifluoroacetate

Recent advances of organic polymers for zinc-ion batteries

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