The composite of Ketjen black and Ti4O7-modified separator for enhancing the electrochemical properties of lithium sulfur battery

Xiao, Wu; Yao, Shanshan; Liu, Mingquan; Pang, Shengli; Shen, Xiangqian; Li, Tianbao; Qin, Shibiao

doi:10.1007/s11581-021-04004-1

Cited by 7 publications

(7 citation statements)

References 42 publications

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“…Stable electrochemical reactions can be attained as long as the lower plateau region controls the charge capacity. By contrast, as reported by Wu et al, the capacity fading was very rapid for S/KB cathode (fails around 100 cycles with a capacity of 300 mA•h•g −1 ) [62]. In this study, our sample capacity was almost double that of the control after 100 cycles.…”

Section: Resultscontrasting

confidence: 70%

Synthesis and Electrochemical Properties of Lignin-Derived High Surface Area Carbons

et al. 2022

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Activated carbons play an essential role in developing new electrodes for renewable energy devices due to their electrochemical and physical properties. They have been the subject of much research due to their prominent surface areas, porosity, light weight, and excellent conductivity. The performance of electric double-layer capacitors (EDLCs) is highly related to the morphology of porous carbon electrodes, where high surface area and pore size distribution are proportional to capacitance to a significant extent. In this work, we designed and synthesized several activated carbons based on lignin for both supercapacitors and Li-S batteries. Our most favorable synthesized carbon material had a very high specific surface area (1832 m2·g−1) and excellent pore diameter (3.6 nm), delivering a specific capacitance of 131 F·g−1 in our EDLC for the initial cycle. This translates to an energy density of the supercapacitor cell at 55.6 Wh·kg−1. Using this material for Li-S cells, composited with a nickel-rich phosphide and sulfur, showed good retention of soluble lithium polysulfide intermediates by maintaining a specific capacity of 545 mA·h·g−1 for more than 180 cycles at 0.2 C.

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Section: Resultscontrasting

confidence: 70%

Synthesis and Electrochemical Properties of Lignin-Derived High Surface Area Carbons

et al. 2022

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“…It is found that the binding energy is shifted (144.2/149.2 eV → 133.6/148.6 eV). This is attributed to the strong chemical bond adsorption of polysulfide by Gd 2 O 3 nanorods 57,58 . At the same time, the analysis of S 2p (Figure 7B) shows that the peaks of spin‐orbit splitting binding energy at 171.0/169.8 eV represent polysulfide complexes produced by polysulfide oxidation, 169.0/167.8 eV represent Li 2 SO 3 produced by electrolyte decomposition, 165.5/164.3 eV, 163.8/162.6 eV and 163.1/161.9 eV are S, Li 2 S 2 and Li 2 S, respectively 59,60 .…”

Section: Resultsmentioning

confidence: 89%

Gadolinium oxide nanorods decorated Ketjen black@sulfur composites as functional catalyzing polysulfides conversion in lithium/sulfur batteries

Wang

et al. 2022

Intl J of Energy Research

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Summary The development of lithium/sulfur batteries (LSBs) was hindered due to the shuttling of lithium polysulfides in electrolytes and sluggish electrochemical kinetics of polysulfides. To address these stumbling blocks, we designed gadolinium oxide (Gd2O3) nanorods decoration of ketjen black@sulfur (Gd2O3/KB@S) composite that adsorbs and provides sufficient sites with lithium polysulfides interaction. The Gd2O3 nanorods play a key role in the adsorption and catalysis performance of polysulfides, which further accelerate the redox kinetics. Consequently, the Gd2O3/LB@S cathode with sulfur loading of 3.1 mg cm−2 attained a high initial discharge capacity of 817.2 mAh g−1 at 0.5 C with a decaying rate of 0.097% per cycle over 500 cycles. Even with high sulfur loading of 5 mg cm−2, the Gd2O3/KB@S cathode also presents a capacity of 5.1 mAh at 0.2 C with retention of 73% over 160 cycles. The strategy proposed here would advance the development of continuous rare earth oxides in the field of rechargeable batteries.

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“…After further removal of oxygen by either increasing the Mg intent or reaction temperature, collapse of the anatase structure is observed, resulting in the formation of Ti 2 O 3 and Ti 4 O 7 phases as observed by XRD. These two new oxide phases are characterized by the broadened peaks located at around 238 and 612 cm –1 . , The presence of unpaired electrons as a result of oxygen vacancy formation is captured by ESR spectroscopy. As can be seen from Figure i, an isotropic Lorentz-shape signal is observed for all the samples and the calculated g-values are 2.003–2.005 for the single electron trapped in oxygen vacancies and 1.98–1.99 for Ti 3+ species. − With the transition to the metallic phase for samples TO-1-650 and TO-1-750, the ESR signal is strongly weakened and distorted because of the skin effect of metallic materials. , …”

Section: Resultsmentioning

confidence: 99%

“…These two new oxide phases are characterized by the broadened peaks located at around 238 and 612 cm −1 . 29,30 The presence of unpaired electrons as a result of oxygen vacancy formation is captured by ESR spectroscopy. As can be seen from Figure 2i, an isotropic Lorentz-shape signal is observed for all the samples and the calculated g-values are 2.003−2.005 for the single electron trapped in oxygen vacancies and 1.98−1.99 for Ti 3+ species.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Enhancement and Inversion of Absorptive Nonlinearity Induced by Topochemically Controlled Insulator-to-Metal Transition

et al. 2021

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The nonresonant, nonlinear optical (NLO) absorption of photons with sub-bandgap energies by gapped insulators is often dominated by a two-photon or multiphoton process, which is characterized by a positive NLO absorption coefficient and manifests as reverse saturable absorption. We show here that this absorptive nonlinearity can be reversed to saturable absorption through controlled insulator-to-metal transition. As exemplified with the model transition metal oxide TiO 2 , we demonstrate a crossover of NLO absorption coefficients from positive to negative values accompanied by a dramatic enhanced subpicosecond NLO response in the near-infrared (NIR) sub-bandgap spectral region, which is realized by topochemical engineering of oxygen stoichiometry. From first-principles electronic structure calculations, the inversion of absorption nonlinearity is associated with the oxygen deficiency-controlled filling of the Ti-3d band that drives a transition from the gapped insulating phase to a gapless metallic phase. We show further that the resultant SA behavior can be leveraged to drive a NIR optical switch that enables both Q-switched and mode-locked laser pulse generation. The methodology for engineering the NLO response by controlling the energetics and d-band filling could be extended for similar TM oxides and exploited further for ultrafast photonics applications.

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The composite of Ketjen black and Ti4O7-modified separator for enhancing the electrochemical properties of lithium sulfur battery

Cited by 7 publications

References 42 publications

Synthesis and Electrochemical Properties of Lignin-Derived High Surface Area Carbons

Synthesis and Electrochemical Properties of Lignin-Derived High Surface Area Carbons

Gadolinium oxide nanorods decorated Ketjen black@sulfur composites as functional catalyzing polysulfides conversion in lithium/sulfur batteries

Enhancement and Inversion of Absorptive Nonlinearity Induced by Topochemically Controlled Insulator-to-Metal Transition

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