Recent Progress in Electrocatalyst for Li‐O<sub>2</sub> Batteries

Zhou, Chang; Xu, Ji‐Jing; Zhang, Xinbo

doi:10.1002/aenm.201700875

Cited by 248 publications

(159 citation statements)

References 192 publications

(279 reference statements)

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vehicles. [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. [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.

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mentioning

confidence: 99%

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

Wang

Dong

et al. 2019

Advanced Energy Materials

139

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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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confidence: 99%

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

Wang

Dong

et al. 2019

Advanced Energy Materials

139

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“…When operated in ambient air, the LEs will rapidly get wet due to H 2 O passing through the open structure of the air cathode, inducing fast corrosion of the Li metal anode and battery abortion . Moreover, the nonuniform deposition of Li metal in LEs upon cycling will generate undesired mossy or dendritic Li, resulting in increased impedance and capacity decay . Sometimes, the resulting dendrite tips will pierce through the separator, introducing serious safety issues (e.g., catastrophic fires or explosion) …”

Section: Introductionmentioning

confidence: 99%

Flexible, Flame‐Resistant, and Dendrite‐Impermeable Gel‐Polymer Electrolyte for Li–O₂/Air Batteries Workable Under Hurdle Conditions

Zou

Lü

Zhong

et al. 2018

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Gel-polymer electrolytes are considered as a promising candidate for replacing the liquid electrolytes to address the safety concerns in Li-O /air batteries. In this work, by taking advantage of the hydrogen bond between thermoplastic polyurethane and aerogel SiO in gel polymer, a highly crosslinked quasi-solid electrolyte (FST-GPE) with multifeatures of high ionic conductivity, high mechanical flexibility, favorable flame resistance, and excellent Li dendrite impermeability is developed. The resulting gel-polymer Li-O /air batteries possess high reaction kinetics and stabilities due to the unique electrode-electrolyte interface and fast O diffusion in cathode, which can achieve up to 250 discharge-charge cycles (over 1000 h) in oxygen gas. Under ambient air atmosphere, excellent performances are observed for coin-type cells over 20 days and for prototype cells working under extreme bending conditions. Moreover, the FST-GPE electrolyte also exhibits durability to protect against fire, dendritic Li, and H O attack, demonstrating great potential for the design of practical Li-O /air batteries.

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“…For example, with a limited capacity of 500 mAh g −1 , LOBs with La 0.6 Sr 0.4 Co 0.9 Mn 0.1 O 3 , La 0.6 Sr 0.4 CoO 3–б , La 0.8 Sr 0.2 Mn 0.6 Ni 0.4 O 3 nanoparticles and hierarchical mesoporous/macroporous La 0.5 Sr 0.5 CoO 3–б nanotubes catalysts can run 53 cycles at 100 mA g −1 , 51 cycles at 0.1 mA cm −1 , 79 cycles at 200 mA g −1 and 50 cycles at 0.1 mA cm −1 , respectively. So the cycle stability of LOBs with 3D‐LSCF catalyst is very outstanding among other perovskite catalysts ,,…”

Section: Figurementioning

confidence: 99%

Efficiency of 3D‐Ordered Macroporous La_0.6Sr_0.4Co_0.2Fe_0.8O₃ as an Electrocatalyst for Aprotic Li‐O₂ Batteries

et al. 2019

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Li‐O 2 batteries (LOBs) with an extremely high theoretical energy density have been reported to be the most promising candidates for future electric storage systems. Porous catalysts can be beneficial for LOBs. Herein, 3D‐ordered macroporous La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 perovskite oxides (3D‐LSCF) are applied as cathode catalysts in LOBs. With a high Brunauer‐Emmett‐Teller surface area (21.8 m 2 g −1 ) and unique honeycomb‐like macroporous structure, the 3D‐LSCF catalysts possess a much higher efficiency than La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF) nanoparticles. The unique 3D‐ordered macropores play a significant role in the product deposition as well as oxygen and electrolyte transmission, which are crucial for the discharge‐charge processes of LOBs.

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Recent Progress in Electrocatalyst for Li‐O₂ Batteries

Cited by 248 publications

References 192 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

Flexible, Flame‐Resistant, and Dendrite‐Impermeable Gel‐Polymer Electrolyte for Li–O₂/Air Batteries Workable Under Hurdle Conditions

Efficiency of 3D‐Ordered Macroporous La_0.6Sr_0.4Co_0.2Fe_0.8O₃ as an Electrocatalyst for Aprotic Li‐O₂ Batteries

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Recent Progress in Electrocatalyst for Li‐O2 Batteries

Cited by 248 publications

References 192 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

Flexible, Flame‐Resistant, and Dendrite‐Impermeable Gel‐Polymer Electrolyte for Li–O2/Air Batteries Workable Under Hurdle Conditions

Efficiency of 3D‐Ordered Macroporous La0.6Sr0.4Co0.2Fe0.8O3 as an Electrocatalyst for Aprotic Li‐O2 Batteries

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Recent Progress in Electrocatalyst for Li‐O₂ 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

Flexible, Flame‐Resistant, and Dendrite‐Impermeable Gel‐Polymer Electrolyte for Li–O₂/Air Batteries Workable Under Hurdle Conditions

Efficiency of 3D‐Ordered Macroporous La_0.6Sr_0.4Co_0.2Fe_0.8O₃ as an Electrocatalyst for Aprotic Li‐O₂ Batteries