Impedance spectroscopy studies of changes in the properties of lithium-sulfur cells in the course of cycling

Колосницын, В. С.; Kuzmina, Elena; Карасева, Е. В.; Mochalov, S. É.

doi:10.1134/s1023193511070093

Cited by 43 publications

(38 citation statements)

References 2 publications

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“…4. Using the equivalent circuit 57,58 shown in inset, the plots agree well with the collected impedance spectra and the detailed element values are listed in Table S3. R el represents the Ohmic resistances of electrolyte and electrode.…”

Section: Resultssupporting

confidence: 64%

High-performance lithium/sulfur batteries by decorating CMK-3/S cathodes with DNA

Zhou

et al. 2015

J. Mater. Chem. A

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ARTICLE This journal isProhibiting lithium polysulfides from being dissolved to electrolyte is the most critical challenge for pursuing high-performance Li/S battery. Taking full advantage of interactions between polysulfides and functional groups of third-party additives has been proven to be an efficient strategy. In the present work, we selected DNA to decorate the CMK -3/S cathodes. The −P=O and =N− sites of the constituent deoxyribonucleotides of DNA are demonstrated to be capable of anchoring polysulfides through our DFT calculations. Experimental results show that a fine adding amount of DNA into the CMK-3/S composite enables a significant improvement to cyclic performance. In particular, with a moderate DNA loading rate, the DNA post -load procedure offers a discharge capacity of 771 mAh•g -1 at 0.1 C after 200 cycles (retention 70.7% of the initial), which behaves slightly better than the DNA pre-load procedure. The proposed DNA decorating scheme may provide an applicable technical solution for developing high -performance Li/S batteries for fulfilling market.

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Section: Resultssupporting

confidence: 64%

High-performance lithium/sulfur batteries by decorating CMK-3/S cathodes with DNA

Zhou

et al. 2015

J. Mater. Chem. A

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“…The variation of R s with DoD is a characteristic feature of Li-S cells that has been observed in various electrolyte chemistries by electrochemical impedance spectroscopy (EIS) [15][16][17][18] . The variation of R s with DoD is a characteristic feature of Li-S cells that has been observed in various electrolyte chemistries by electrochemical impedance spectroscopy (EIS) [15][16][17][18] .…”

mentioning

confidence: 99%

Modeling the voltage loss mechanisms in lithium–sulfur cells: the importance of electrolyte resistance and precipitation kinetics

Zhang

Marinescu

O’Neill

et al. 2015

Phys. Chem. Chem. Phys.

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Understanding of the complex electrochemical, transport, and phase-change phenomena in Li-S cells requires experimental characterization in tandem with mechanistic modeling. However, existing Li-S models currently contradict some key features of experimental findings, particularly the evolution of cell resistance during discharge. We demonstrate that, by introducing a concentration-dependent electrolyte conductivity, the correct trends in voltage drop due to electrolyte resistance and activation overpotentials are retrieved. In addition, we reveal the existence of an often overlooked potential drop mechanism in the low voltage-plateau which originates from the limited rate of Li2S precipitation.

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“…After 50th cycle, the impedance responses of RGO/S composite cathode have changed that two obvious semicircles appear as shown in inset of Fig.8, the additional semicircle in the high frequency region can be explained as Li + migration through the SEI films [33,34].The diameter of the semicircles all increases slightly, which indicates the increasing charge-transfer resistance and interface charge-transfer resistance during the cycling process. However, for the RGO/S composite electrode, upon EIS analysis, the increasing resistance of the composite was not severe compared to other related works [20,30].…”

Section: Resultsmentioning

confidence: 90%

“…The high-frequency semicircle represents the charge transfer resistances of electrolyte and electrode. The semicircle at high frequency to medium is attributable to the interface charge-transfer resistance, and the inclined line at the low-frequency region corresponds to Warburg impedance [33,34].Obviously, the RGO/S composite cathode exhibits a lower charge transfer resistance than that of the GO/S which could be attributed to the enhanced conductivity of HI reduced graphene.…”

Section: Resultsmentioning

confidence: 97%

Self-assembled graphene/sulfur composite as high current discharge cathode for lithium-sulfur batteries

Huang

Zong

et al. 2015

Electrochimica Acta

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Impedance spectroscopy studies of changes in the properties of lithium-sulfur cells in the course of cycling

Cited by 43 publications

References 2 publications

High-performance lithium/sulfur batteries by decorating CMK-3/S cathodes with DNA

High-performance lithium/sulfur batteries by decorating CMK-3/S cathodes with DNA

Modeling the voltage loss mechanisms in lithium–sulfur cells: the importance of electrolyte resistance and precipitation kinetics

Self-assembled graphene/sulfur composite as high current discharge cathode for lithium-sulfur batteries

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