Three-Dimensional Nanofibrous Air Electrode Assembled With Carbon Nanotubes-Bridged Hollow Fe<sub>2</sub>O<sub>3</sub> Nanoparticles for High-Performance Lithium–Oxygen Batteries

Jung, Ji‐Won; Jang, Ji‐Soo; Yun, Tae Gwang; Yoon, Ki Ro; Kim, Il‐Doo

doi:10.1021/acsami.7b15421

Cited by 53 publications

(31 citation statements)

References 36 publications

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“…The diffraction peaks located at 32.0° and 35.4° can be indexed into (100) and (101) planes of Li 2 O 2 (JCPDS Card No. [15,16,42,46] To further give insight into the reversibility in the operation of oxygen reduction/evolution process, the impedances for the cells based on the three cathodes at different status are identified by electrochemical impedance spectroscopy (EIS). [48,49] And after deep recharge process, these characteristic peaks related to Li 2 O 2 completely disappear, implying that the discharge/charge capacity contributions are mainly derived from the highly reversible formation and decomposition of Li 2 O 2 .…”

Section: Analysis Of the Cathode Electrodes After Discharge And Chargementioning

confidence: 99%

“…[26,51] However, the characteristic absorption peaks of side reaction products (Li 2 CO 3 , HCOOLi, CH 3 COOLi) can be distinctly observed in both the discharged/ charged NiCo 2 S 4 and NiO electrodes, meaning much inferior rechargeability. [13][14][15]32,35,37] Combined with the EIS (Figure 7b and Figure S13, Supporting Information) and XPS results (Figure 7c-f and Figure S12, Supporting Information), it is believed that the NiCo 2 S 4 @NiO heterostructure electrocatalyst plays a critical role in suppressing side reactions and thus improving cycle life. For example, the peak located at 860 cm −1 can be identified as Li 2 CO 3 , which has been reported by Yan's and Zhang's groups.…”

Section: Analysis Of the Cathode Electrodes After Discharge And Chargementioning

confidence: 99%

“…In a typical electrochemical reaction, the discharge product of lithium peroxide (Li 2 O 2 ) can reversibly form and decompose on cathode side during oxygen reduction reaction (ORR) and subsequent oxygen evolution reaction (OER) processes, respectively (O 2 + 2Li + + 2e − ↔ Li 2 O 2 ). [11][12][13] Recent works demonstrate that large-sized Li 2 O 2 aggregations (large discs, [14,15] toroids, [16][17][18][19] spheres, [20,21] etc.) During ORR process, Li 2 O 2 precipitations clog the eversmooth passageways of reactants and passivate electrode surfaces, deteriorating electrical connection between catalysts and efficient active sites, raising charge transfer impedance.…”

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confidence: 99%

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Hierarchical NiCo₂S₄@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O₂ Batteries

Wang

Dong

et al. 2019

Advanced Energy Materials

131

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vehicles. In a typical electrochemical reaction, the discharge product of lithium peroxide (Li 2 O 2 ) can reversibly form and decompose on cathode side during oxygen reduction reaction (ORR) and subsequent oxygen evolution reaction (OER) processes, respectively (O 2 + 2Li + + 2e − ↔ Li 2 O 2 ). [1][2][3][4] Nevertheless, several critical barriers embracing unsatisfactory charge/discharge polarization, poor rate capability, and limited cycle life make the fantastic technology far from practical application, which can be mainly attributed to the intrinsic characteristic of discharge products including insulation property and insolubilization in aprotic electrolytes. During ORR process, Li 2 O 2 precipitations clog the eversmooth passageways of reactants and passivate electrode surfaces, deteriorating electrical connection between catalysts and efficient active sites, raising charge transfer impedance. In OER process, the insulating Li 2 O 2 precipitations are knotty to be composed, delivering unsatisfactory dynamic performance and triggering higher overpotential. [5][6][7][8][9][10] It has been well established that the morphology and distribution of Li 2 O 2 determined by different growth pathway during ORR govern the battery chemistry and hence the electrochemical performance. [11][12][13] Recent works demonstrate that large-sized Li 2 O 2 aggregations (large discs, [14,15] toroids, [16][17][18][19] spheres, [20,21] etc.) contribute to large discharge capacity output during ORR but at the cost of huge charge overpotential during OER, because large sized Li 2 O 2 products do not usually well contact with active sites and are not easily decomposed, thus resulting in a larger charging voltage gap and sluggish charging kinetics. On the contrary, the formation of conformal Li 2 O 2 films or small amorphous Li 2 O 2 particles during ORR can offer much smaller charge transfer resistance and thus improve kinetics performance obviously during the following charge process. [22][23][24][25] Unfortunately, under such condition, the exposed active sites of catalyst matrix would be inactivated quickly, hence leading to a lower discharge capacity. To alleviate this contradiction between large ORR capacity and small OER voltage gap, it mainly focuses on oxygen catalytic cathode to construct elaborate hierarchical porous structures and optimize microstructure of highly efficient dual-catalystThe critical challenges of Li-O 2 batteries lie in sluggish oxygen redox kinetics and undesirable parasitic reactions during the oxygen reduction reaction and oxygen evolution reaction processes, inducing large overpotential and inferior cycle stability. Herein, an elaborately designed 3D hierarchical heterostructure comprising NiCo 2 S 4 @NiO core-shell arrays on conductive carbon paper is first reported as a freestanding cathode for Li-O 2 batteries. The unique hierarchical array structures can build up multidimensional channels for oxygen diffusion and electrolyte impregnation. A built-in interfacial potential between NiCo 2 S 4 and NiO c...

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Section: Analysis Of the Cathode Electrodes After Discharge And Chargementioning

confidence: 99%

Section: Analysis Of the Cathode Electrodes After Discharge And Chargementioning

confidence: 99%

mentioning

confidence: 99%

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Hierarchical NiCo₂S₄@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O₂ Batteries

Wang

Dong

et al. 2019

Advanced Energy Materials

131

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“…Nowadays, secondary batteries with a high energy density have attracted an ever‐increasing attention. Among them, aprotic lithium‐oxygen (Li−O 2 ) batteries are considered as the most promising candidate due to their extremely high energy density up to 3505 W h kg −1 . However, the practical applications of Li−O 2 batteries have to face many difficulties, such as the sluggish reaction kinetics, high charge overpotential and chemical/electrochemical instability of Li 2 O 2 (or LiO 2 ) with carbon and electrolyte, leading to rapid degradation of electrochemical performance during cycling …”

Section: Introductionmentioning

confidence: 99%

“…Among them, aprotic lithium-oxygen (LiÀ O 2 ) batteries are considered as the most promising candidate due to their extremely high energy density up to 3505 W h kg À 1 . [1][2][3] However, the practical applications of LiÀ O 2 batteries have to face many difficulties, such as the sluggish reaction kinetics, high charge overpotential and chemical/electrochemical instability of Li 2 O 2 (or LiO 2 ) with carbon and electrolyte, leading to rapid degradation of electrochemical performance during cycling. [2,[4][5][6] To solve these dilemmas, a cathode with a highly efficient catalytic performance for oxygen reduction reaction (ORR)/ oxygen evolution reaction (OER) is necessary.…”

Section: Introductionmentioning

confidence: 99%

Bi₂S₃/Ketjen Black as a Highly Efficient Bifunctional Catalyst for Long‐Cycle Lithium‐Oxygen Batteries

Zhu

Chen

et al. 2019

ChemElectroChem

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A catalyst that possesses an efficient bifunctional catalytic activity is vital to achieve long‐life lithium‐oxygen (Li−O2) batteries. Herein, a bismuth sulfide/Ketjen black (Bi2S3/KB) hybrid is synthesized through a one‐step hydrothermal method and used as a bifunctional catalyst in Li−O2 batteries. The results demonstrate that Li−O2 batteries with the Bi2S3/KB hybrid exhibit both a higher capacity and a lower overpotential than those with the bare bismuth sulfide (Bi2S3) and KB catalysts. A Li−O2 battery with the Bi2S3/KB catalyst shows an excellent cycle life of 391 cycles at 1000 mA h g−1, which is one of the best results for batteries with sulfide catalysts. The excellent electrochemical performance of the batteries originates from the synergistic catalytic effect between Bi2S3 and KB. It is found that the Li2O2 is deposited on Bi2S3 nanorods prior to on KB upon discharge, which can defer the deactivation of the cathode and inhibit the side reactions.

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A Critical Review on Functionalization of Air‐Cathodes for Nonaqueous Li–O₂ Batteries

Balaish

Jung

Kim

et al. 2019

Adv Funct Materials

140

100

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This review reports on the most updated technological aspects of Li-air battery cathode materials. It provides the reader with recent developments, alongside critical views. The requirements for air-cathodes, as well as the classification and characterization of carbon-based and carbon-free air cathodes, are listed. The effects of two major substituent groups of materials, namely carbon and advanced materials (metals, metal-oxides, metal-carbides, and metal-nitrides) aimed at replacing carbon, are discussed in terms of their chemical and electrochemical stability. The report covers aspects of surface chemistry and structure influence on the electrolyte and discharge products stability. The review also reports on the efforts to suppress side reactions and deterioration of the polymeric binders (if a composite electrode is being considered). This is recognized as a means to enhance Li-air battery performance. The report concludes with an outlook and perspective, providing the readers with some insight on other factors and their impact on the long road toward a viable air-cathode suitable for Li-air battery operations.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201808303.respectively. [1] The configuration of an aprotic LOB is based on coupling lithium metal anode and air-breathing cathode in a non-aqueous electrolyte system. The electrochemical reactions occurring during discharge are complex multistep reactions and may involve dissolved and/or adsorbed species alongside parasitic reactions. [2][3][4][5] Oxygen reduction reaction during discharge largely depends on the cathode and electrolytes characteristics; yet, a dominant process involving a two-electron oxygen reduction reaction (ORR), with the formation of Li 2 O 2 , is reported, according to the following reaction [6] The reverse process, namely lithium peroxide oxidation, occurs upon charging. The formation/decomposition of Li 2 O 2 during discharge/charge is often accompanied by parasitic side reactions, due to instability of the major battery components (cathode, electrolyte, and anode) under operating conditions. [7][8][9][10][11][12] While lithium metal anode corrosion can be mitigated by a protective solid electrolyte (SE) membrane, [13][14][15] the electrolyte and cathode are considered as the most challenging components of LOB. Much efforts have been placed on understanding the role of the electrolyte, its degradation, on Li-O 2 reaction mechanism and battery performance. [16][17][18][19][20] Nonetheless, the high discharge/ charge overpotential and severe capacity loss in the course of cycling are also largely related to the air-breathing cathode. A stable, high surface area, cost-efficient air-electrode with excellent catalytic activities toward oxygen reduction and oxidation is crucial for the development of practical LOB. Cathode materials should be stable, durable, and hold interfaces with minimum surface oxide layers, which can inhibit charge transfer during the charging p...

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Three-Dimensional Nanofibrous Air Electrode Assembled With Carbon Nanotubes-Bridged Hollow Fe₂O₃ Nanoparticles for High-Performance Lithium–Oxygen Batteries

Cited by 53 publications

References 36 publications

Hierarchical NiCo₂S₄@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O₂ Batteries

Hierarchical NiCo₂S₄@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O₂ Batteries

Bi₂S₃/Ketjen Black as a Highly Efficient Bifunctional Catalyst for Long‐Cycle Lithium‐Oxygen Batteries

A Critical Review on Functionalization of Air‐Cathodes for Nonaqueous Li–O₂ Batteries

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Three-Dimensional Nanofibrous Air Electrode Assembled With Carbon Nanotubes-Bridged Hollow Fe2O3 Nanoparticles for High-Performance Lithium–Oxygen Batteries

Cited by 53 publications

References 36 publications

Hierarchical NiCo2S4@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O2 Batteries

Hierarchical NiCo2S4@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O2 Batteries

Bi2S3/Ketjen Black as a Highly Efficient Bifunctional Catalyst for Long‐Cycle Lithium‐Oxygen Batteries

A Critical Review on Functionalization of Air‐Cathodes for Nonaqueous Li–O2 Batteries

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Three-Dimensional Nanofibrous Air Electrode Assembled With Carbon Nanotubes-Bridged Hollow Fe₂O₃ Nanoparticles for High-Performance Lithium–Oxygen Batteries

Hierarchical NiCo₂S₄@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O₂ Batteries

Hierarchical NiCo₂S₄@NiO Core–Shell Heterostructures as Catalytic Cathode for Long‐Life Li‐O₂ Batteries

Bi₂S₃/Ketjen Black as a Highly Efficient Bifunctional Catalyst for Long‐Cycle Lithium‐Oxygen Batteries

A Critical Review on Functionalization of Air‐Cathodes for Nonaqueous Li–O₂ Batteries