Titanium silicalite as a radical-redox mediator for high-energy-density lithium–sulfur batteries

Chan, Dan; Xiao, Zhubing; Guo, Zeqing; Lai, Yuchong; Zhang, Yonggui; Zhou, Suya; Ding, Xingwei; Nie, Huagui; Yang, Zhi

doi:10.1039/c9nr06700k

Cited by 9 publications

(5 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Notably, the absorption peaks located at 420 nm, 470 nm, and 617 nm have been attributed to specific sulfur-related ions. Specifically, these peaks correspond to S 4 2− , S 6 2− , and S 3 − , respectively, as documented in previous research [41,42]. The UV-VIS spectra provide valuable insights into the electrochemical reaction process occurring within the LSBs.…”

Section: Resultssupporting

confidence: 69%

Dual-Functional Electrolyte Additive for Lithium–Sulfur Batteries Limits Lithium Dendrite Formation and Increases Sulfur Utilization Rate

Liu,

Wu,

et al. 2023

Batteries

View full text Add to dashboard Cite

Lithium–sulfur batteries (LSBs) have received great attention as promising candidates for next-generation energy-storage systems due to their high theoretical energy density. However, their practical energy density is limited by a large electrolyte-to-sulfur (E/S) ratio (>10 µL electrolyte/mg s), and their cycle performance encounters challenges from electrode passivation and Li dendrite formation. In this work, a dual-functional electrolyte additive of tetraethylammonium nitrate (TEAN) is presented to address these issues. NO3− as a high-donor-number (DN) salt anion can promote polysulfide dissolution, increase sulfur utilization, and alleviate electrode passivation. The tetraethylammonium cation can adsorb around Li protrusions to form a lithiophobic protective layer to inhibit the formation of Li dendrites. TEAN LSBs show improving capacity, cycling stability, and higher coulombic efficiency under lean electrolyte (5 μL electrolyte/mg s) conditions.

show abstract

Section: Resultssupporting

confidence: 69%

Dual-Functional Electrolyte Additive for Lithium–Sulfur Batteries Limits Lithium Dendrite Formation and Increases Sulfur Utilization Rate

Liu,

Wu,

et al. 2023

Batteries

View full text Add to dashboard Cite

show abstract

“…We attributed the appearance of more short‐chain polysulfides to the faster catalytic conversion of long‐chain polysulfides into short‐chain polysulfides in the battery with the CNTs–COOH@hemin cathode. [ 42 ]…”

Section: Resultsmentioning

confidence: 99%

Biomimetic Molecule Catalysts to Promote the Conversion of Polysulfides for Advanced Lithium–Sulfur Batteries

Ding

Yang

Zhou

et al. 2020

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

To overcome the shuttle effect in Li–S batteries, novel biomimetic molecule catalysts are synthesized by grafting hemin molecules to three functionalized carbon nanotube systems (CNTs–COOH, CNTs–OH, and CNTs–NH2). The Li–S battery using the CNTs–COOH@hemin cathode exhibits the optimal initial specific capacity (1637.8 mAh g−1) and cycle durability (up to 1800 cycles). Various in situ characterization techniques, such as Raman spectroscopy, Fourier‐transform infrared reflection absorption spectroscopy, and UV–vis spectroscopy, combined with density functional theory computations are used to investigate the structure–reactivity correlation and the working mechanism in the Li–S system. It is demonstrated that the unique structure of the CNTs‐COOH@hemin composite with good conductivity and adequate active sites resulting from molecule catalyst as well as the strong absorption to polysulfides entrapped by the coordinated Fe(III) complex with FeO bond enables the homogeneous dispersion of S, facilitates the catalysis and conversion of polysulfides, and improves the battery's performance.

show abstract

“…54 Thus, we observed the strongest intensity and lowest wavenumber of the C−N peak in the IR spectra between 2.7 and 2.4 V in Figure 4b. When the long-chain LiPSs (Li 2 S n , 4 < n ≤ 8) are further reduced to form short-chain LiPSs (Li 2 S n , n ≤ 4) and finally insoluble Li 2 S 2 / Li 2 S in the potential region of 2.4−1.8 V, 55 the ability of LiPSs to attract electrons from Fe and N atoms become weaker, yielding a stronger C−N bond and leading to a decrease of the surface normal component of C−N dipoles because of the smaller θ or C−N dipole moment. As a result, decreased intensity and an upshift of the C−N peak were observed.…”

Section: Resultsmentioning

confidence: 99%

“…The two-electrode spectroscopic cell was prepared using Gh/FePc+OFN modified glassy carbon (GC) as the cathode, Ti wire as the anode, and 0.5 mM L –1 Li 2 S n ( n = 8, 6, 4) electrolyte, as described in our previous work. , The LiPS solutions (Li 2 S 8 , Li 2 S 6 , Li 2 S 4 ) were prepared by mixing Li 2 S and S 8 powder with the stoichiometric molar ratio (1:7 for Li 2 S 8 , 1:5 for Li 2 S 6 , and 1:3 for Li 2 S 4 ) into DMSO. After stirring for 24 h at room temperature (∼25 °C) in an argon atmosphere, the cell was assembled in an argon-filled glovebox and sealed with low vapor-pressure epoxy.…”

Section: Methodsmentioning

confidence: 99%

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium–Sulfur Batteries

et al. 2020

Self Cite

View full text Add to dashboard Cite

The sluggish reaction kinetics at the cathode/electrolyte interface of lithium–sulfur (Li–S) batteries limits their commercialization. Herein, we show that a dual-regulation system of iron phthalocyanine (FePc) and octafluoronaphthalene (OFN) decorated on graphene (Gh), denoted as Gh/FePc+OFN, accelerates the interfacial reaction kinetics of lithium polysulfides (LiPSs). Multiple in situ spectroscopy techniques and ex situ X-ray photoelectron spectroscopy combined with density functional theory calculations demonstrate that FePc acts as an efficient anchor and scissor for the LiPSs through Fe···S coordination, mainly facilitating their liquid–liquid transformation, whereas OFN enables Li-bond interaction with the LiPSs, accelerating the kinetics of the liquid–solid nucleation and growth of Li2S. This dual-regulation system promotes the smooth conversion reaction of sulfur, thereby improving the battery performance. A Gh/FePc+OFN-based Li–S cathode delivered an ultrahigh initial capacity of 1604 mAh g–1 at 0.2 C, with an ultralow capacity decay rate of 0.055% per cycle at 1 C over 1000 cycles.

show abstract

Titanium silicalite as a radical-redox mediator for high-energy-density lithium–sulfur batteries

Abstract: Lithium–sulfur (Li–S) batteries are receiving intense interest owing to their high energy densities, cost effectiveness, and the natural abundance of sulfur.

Cited by 9 publications

References 44 publications

Dual-Functional Electrolyte Additive for Lithium–Sulfur Batteries Limits Lithium Dendrite Formation and Increases Sulfur Utilization Rate

Dual-Functional Electrolyte Additive for Lithium–Sulfur Batteries Limits Lithium Dendrite Formation and Increases Sulfur Utilization Rate

Biomimetic Molecule Catalysts to Promote the Conversion of Polysulfides for Advanced Lithium–Sulfur Batteries

Dual-Regulation Strategy to Improve Anchoring and Conversion of Polysulfides in Lithium–Sulfur Batteries

Contact Info

Product

Resources

About