Discovery of Dual‐Functional Amorphous Titanium Suboxide to Promote Polysulfide Adsorption and Regulate Sulfide Growth in Li–S Batteries

Gueon, Donghee; Yoon, Jisu; Cho, Jinhan; Moon, Jun Hyuk

doi:10.1002/advs.202200958

Cited by 14 publications

(1 citation statement)

References 61 publications

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“…As shown in Figure S6, our opinion is confirmed by the morphology of the deposition of different cathodes. Generally, the process of 3D nucleation for Li 2 S is controlled by the bulk diffusion and transformation of the polysulfide and the deposition of dissolved Li 2 S in the bulk of the material. , For the growth process of Li 2 S on FeN x -NPC, the cathode morphology at different discharge depths is analyzed by SEM (as shown in Figure S7). When discharging to point a, the Li 2 S has not started to deposit; therefore, the cathode morphology has not changed (Figure S7a).…”

Section: Resultsmentioning

confidence: 99%

Regulating Polysulfide Transformation and Deposition Kinetics in Lithium–Sulfur Batteries Based on 3D Conductive Framework

Liu

Meng

et al. 2023

ACS Appl. Mater. Interfaces

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The polysulfide shuttle effect and slow liquid−solid conversion are supposed to be the main bottlenecks limiting lithium−sulfur battery practicality. Although a great deal of research has been devoted to the nucleation and transformation kinetics of polysulfides, many implicit details cannot be captured. In this work, we design a conducting network, FeN x -NPC, derived from hemin, and induce a 3D nucleation mode. Different from the control group with the 2D nucleation mode, a higher Li 2 S deposition and earlier nucleation are observed. Here, in situ impedance is applied to further understand the potential relationship between nucleation mode and liquid−solid transformation, and DRT results from impedance data are systematically compared from two aspects: (1) single battery under different voltages and (2) different batteries under the same voltage. It reveals that the 3D nucleation mode ensures more growth sites, on which a covered thin Li 2 S layer exhibits no charge transfer limitation. What is more, the porous structure with in situ-derived nanotubes favors Li + faster diffusion. Hence, these advantages allow Li−S cells to deliver high capacity (about 1423 mA h g −1 at 0.1 C), low capacity attenuation (0.029% per cycle at 2 C), and excellent rate performance (620 mA h g −1 at 5 C).

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Section: Resultsmentioning

confidence: 99%

Regulating Polysulfide Transformation and Deposition Kinetics in Lithium–Sulfur Batteries Based on 3D Conductive Framework

Liu

Meng

et al. 2023

ACS Appl. Mater. Interfaces

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Discovery of Dual‐Functional Amorphous Titanium Suboxide to Promote Polysulfide Adsorption and Regulate Sulfide Growth in Li–S Batteries

et al. 2022

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Lithium‐sulfur (Li–S) batteries are promising as next‐generation energy storage systems. Adsorbents for sulfide species are favorably applied to the cathode, but this substrate often results in a surface‐passivating lithium sulfide(Li 2 S) film with a strong adsorption of Li 2 S. Here, an amorphous titanium suboxide (a‐TiOx) is presented that strongly adsorbs lithium polysulfides (Li 2 S x , x < 6) but relatively weakly adsorbs to Li 2 S. With these characteristics, the a‐TiO x achieves high conversion of Li 2 S x and high sulfur utilization accompanying the growth of particulate Li 2 S. The DFT calculations present a mechanism for particulate growth driven by the promoted diffusion and favorable clustering of Li 2 S. The a‐TiO x ‐coated carbon nanotube‐assembled film (CNTF) cathode substrate cell achieves a high discharge capacity equivalent to 90% sulfur utilization at 0.2 C. The cell also delivers a high capacity of 850 mAh g –1 even at the ultra‐high‐speed of 10 C and also exhibits high stability of capacity loss of 0.0226% per cycle up to 500 cycles. The a‐TiO x /CNTF is stacked to achieve a high loading of 7.5 mg S cm –2 , achieving a practical areal capacity of 10.1 mAh cm –2 .

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Porous Organic Polymers as Active Electrode Materials for Energy Storage Applications

Sun,

Li,

Liang

et al. 2023

Small Methods

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Eco‐friendly and efficient energy production and storage technologies are highly demanded to address the environmental and energy crises. Porous organic polymers (POPs) are a class of lightweight porous network materials covalently linked by organic building blocks, possessing high surface areas, tunable pores, and designable components and structures. Due to their unique structural and compositional advantages, POPs have recently emerged as promising electrode materials for energy storage devices, particularly in the realm of supercapacitors and ion batteries. In this work, a comprehensive overview of recent progress and applications of POPs as electrode materials in energy storage devices, including the structural features and synthesis strategies of various POPs, as well as their applications in supercapacitors, lithium batteries, sodium batteries, and potassium batteries are provided. Finally, insights are provided into the future research directions of POPs in electrochemical energy storage technologies. It is anticipated that this work can provide readers with a comprehensive background on the design of POPs‐based electrode materials and ignite more research in the development of next‐generation energy storage devices.

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Discovery of Dual‐Functional Amorphous Titanium Suboxide to Promote Polysulfide Adsorption and Regulate Sulfide Growth in Li–S Batteries

Cited by 14 publications

References 61 publications

Regulating Polysulfide Transformation and Deposition Kinetics in Lithium–Sulfur Batteries Based on 3D Conductive Framework

Regulating Polysulfide Transformation and Deposition Kinetics in Lithium–Sulfur Batteries Based on 3D Conductive Framework

Discovery of Dual‐Functional Amorphous Titanium Suboxide to Promote Polysulfide Adsorption and Regulate Sulfide Growth in Li–S Batteries

Porous Organic Polymers as Active Electrode Materials for Energy Storage Applications

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