Ultrathin Lithium Aluminate Nanoflake-Inlaid Sulfur as a Cathode Material for Lithium–Sulfur Batteries with High Areal Capacity

Ghosh, Arnab; Kumar, Ajit; Roy, Amlan; Nguyen, Cuc; Ahuja, Aakash; Adil, Md.; Chatti, Manjunath; Kar, Mega; MacFarlane, Douglas R.; Mitra, Sagar

doi:10.1021/acsaem.0c00597

Cited by 13 publications

(8 citation statements)

References 66 publications

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“…[ 68 ] Ghosh et al investigate the electrocatalysis of LiAlO 2 nanoflake on the redox kinetics of Li–S batteries by in situ Raman techniques coupled with the chronoamperometry (Figure 7c). [ 69 ] The battery was discharged to 2.2 V and held at this potential, during which in situ Raman spectra were collected. A new peak assigning to S 4 2− moiety at around 234 cm −1 appears in the Raman spectra, suggesting the enhanced chemical reduction of long‐chain LiPSs to Li 2 S 4 .…”

Section: The Application Of In Situ/operando Raman For Li–s Batteriesmentioning

confidence: 99%

In Situ/Operando Raman Techniques in Lithium–Sulfur Batteries

Xue

et al. 2022

Small Structures

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Tremendous efforts have been made to fulfill the promises of lithium–sulfur (Li–S) battery as the candidate for next‐generation energy storage devices. However, challenges such as capacity degradation and dendrite growth still remain, hampering the commercialization of Li–S batteries. Different from the conventional ion‐insertion‐based lithium battery, the electrochemical and chemical processes in the cathode of Li–S battery are based on extremely complex conversion reactions. Together with the uncontrollable hostless lithium deposition process on the anode side, the future development of Li–S batteries faces great difficulty and requires deeper understanding of the fundamental mechanism. Herein, the recent applications of in situ/operando Raman techniques for monitoring the real‐time variations in Li–S batteries are summarized to reveal the reaction mechanism and guide the design of strategies for improving the battery performances. The design concepts and advantages of in situ/operando Raman studies are highlighted, and the future explorations based on such technique are discussed, aiming to accelerate the development progress of Li–S battery for practical applications.

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Section: The Application Of In Situ/operando Raman For Li–s Batteriesmentioning

confidence: 99%

In Situ/Operando Raman Techniques in Lithium–Sulfur Batteries

Xue

et al. 2022

Small Structures

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“…Compared with traditional insertion lithium-ion batteries, LSBs are promising energy storage systems for the next generation due to their high theoretical capacity (1675 mAh·g −1 ) and high energy density (2600 Wh·kg −1 ) [ 2 , 3 ]. However, the practical implementation of Li-S continues to face formidable challenges, such as the poor electrical conductivity of sulfur, the series of polysulfide intermediates (Li 2 Sn, 6 ≤ n ≤ 8) that can dissolve in electrolytes, and the intermediate polysulfides that diffuse to form shuttle effects, which cause pronounced capacity fading [ 4 ]. Further, during charging and discharging, the conversion between sulfur and Li 2 S/Li 2 S 2 can damage the electrode structure and lead to a number of problems such as rapid capacity loss [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Porous Nb2O5 Formed by Anodic Oxidation as the Sulfur Host for Enhanced Performance Lithium-Sulfur Batteries

et al. 2023

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Lithium-sulfur batteries (LSBs), with their high theoretical specific capacity and energy density, have great potential to be a candidate for secondary batteries in the future. However, Li-S batteries suffer from multiple issues and challenges, for example, uneven growth of lithium dendrites, low utilization of the active material (sulfur), and low specific capacity. This paper reports a low-cost and anodic oxidation method to produce niobium pentoxide with a porous structure (P-Nb2O5). A simple one-step process was used to synthesize P-Nb2O5 with porous structures by anodizing niobium at 40 V in fluorinated glycerol. The porous Nb2O5 showed excellent rate capability and good capacity retention by maintaining its structural integrity, allowing us to determine the advantages of its porous structure. As a result of the highly porous structure, the sulfur was not only provided with adequate storage space and abundant adsorption points, but it was also utilized more effectively. The initial discharge capacity with the P-Nb2O5 cathode rose to 1106.8 mAh·g−1 and dropped to 810.7 mAh·g−1 after 100 cycles, which demonstrated the good cycling performance of the battery. This work demonstrated that the P-Nb2O5 prepared by the oxidation method has strong adsorption properties and good chemical affinity.

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“…[12] It was also shown that using ultrathin Lithium aluminate nanoflakes as a polar additive, having an enormous active surface area to immobilize the lithium polysulfides, leads to extremely stable cycling performance in batteries. [13] Furthermore, one-dimensional forms of strontium-europium-based aluminates are luminescent nanoribbons that can function as both light generators and waveguides, and therefore they are suitable materials for miniaturized photonic circuitry. [14] In addition to experimental studies, stabilization of single layer α-AlO displaying indirect semiconducting behavior was also predicted theoretically.…”

Section: Introductionmentioning

confidence: 99%

Electronic, Magnetic and Vibrational Properties of Single Layer Aluminum Oxide

Ozyurt¹,

Molavali²,

Şahin³

2022

Preprint

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The structural, magnetic, vibrational and electronic properties of single layer aluminum oxide (AlO2) are investigated by performing state-of-the-art first-principles calculations. Total energy optimization and phonon calculations reveal that aluminum oxide forms a distorted octahedral structure (1T ′ -AlO2) in its single layer limit. It is also shown that surfaces of 1T ′ -AlO2 display magnetic behavior originating from the O atoms. While the ferromagnetic (FM) state is the most favorable magnetic order for 1T ′ -AlO2, transformation to a dynamically stable antiferromagnetic (AFM) state upon a slight distortion in the crystal structure is also possible. It is also shown that Raman activities (350-400 cm −1 ) obtained from the vibrational spectrum can be utilized to distinguish the possible magnetic phases of the crystal structure. Electronically, both FM and the AFM phases are semiconductors with an indirect band gap and they can form a type-III vdW heterojunction with graphene-like ultra-thin materials. Moreover, it is predicted that presence of oxygen defects that inevitably occur during synthesis and production do not alter the magnetic state, even at high vacancy density. Apparently, ultra-thin 1T ′ -AlO2 with its stable crystal structure, semiconducting nature and robust magnetic state is a quite promising material for nanoscale device applications.

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Ultrathin Lithium Aluminate Nanoflake-Inlaid Sulfur as a Cathode Material for Lithium–Sulfur Batteries with High Areal Capacity

Cited by 13 publications

References 66 publications

In Situ/Operando Raman Techniques in Lithium–Sulfur Batteries

In Situ/Operando Raman Techniques in Lithium–Sulfur Batteries

Porous Nb2O5 Formed by Anodic Oxidation as the Sulfur Host for Enhanced Performance Lithium-Sulfur Batteries

Electronic, Magnetic and Vibrational Properties of Single Layer Aluminum Oxide

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