Investigation of Magnesium–Sulfur Batteries using Electrochemical Impedance Spectroscopy

Cañas, Natalia A.; Hirose, Kei; Pascucci, Brigitta; Wagner, Norbert; Friedrich, K. Andreas; Hiesgen, Renate

doi:10.1016/j.electacta.2020.135787

Cited by 54 publications

(73 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Importantly, from the second cycle, the length of the first discharge plateau at approximately 1.3 V is drastically shortened for the S 8 ‐mixed film, whereas the S 8 ‐sandwich film maintains the plateau to a larger degree resulting in a higher specific energy of the S 8 ‐sandwich for cycle 2–10 (Figure S6 in the Supporting Information). Both films display voltage profiles similar in shape as previously reported Mg‐S batteries with the same electrolyte (note that the voltages in Figure 4 are cathode voltages vs. a Mg reference) [20,22,72] . In the 100th cycle, no clear voltage plateaus are seen for both films.…”

Section: Resultssupporting

confidence: 77%

“…To evaluate the sulfur utilization of the cathode architectures, Li reference cells with a Li metal anode were assembled. As the Li reference cells showed capacities much closer to the theoretical capacity (1300 mA h g −1 for S 8 ‐mixed, 1480 mA h g −1 for S 8 ‐sandwich, shown in Figure S7 in the Supporting Information), the limited capacity for the Mg‐S cells seems to be heavily influenced by the Mg‐specific electrochemistry, such as the known issues related to particularly sluggish reaction kinetics, [16,73] more evident polysulfide shuttling, [27] and self‐discharge [72] …”

Section: Resultssupporting

confidence: 57%

See 1 more Smart Citation

Performance Study of MXene/Carbon Nanotube Composites for Current Collector‐ and Binder‐Free Mg–S Batteries

et al. 2021

View full text Add to dashboard Cite

The realization of sustainable and cheap Mg‐S batteries depends on significant improvements in cycling stability. Building on the immense research on cathode optimization from Li‐S batteries, for the first time a beneficial role of MXenes for Mg‐S batteries is reported. Through a facile, low‐temperature vacuum‐filtration technique, several novel current collector‐ and binder‐free cathode films were developed, with either dipenthamethylene thiuram tetrasulfide (PMTT) or S8 nanoparticles as the source of redox‐active sulfur. The importance of combining MXene with a high surface area co‐host material, such as carbon nanotubes, was demonstrated. A positive effect of MXenes on the average voltage and reduced self‐discharge was also discovered. Ascribed to the rich polar surface chemistry of Ti3C2Tx MXene, an almost doubling of the discharge capacity (530 vs. 290 mA h g−1) was achieved by using MXene as a polysulfide‐confining interlayer, obtaining a capacity retention of 83 % after 25 cycles.

show abstract

Section: Resultssupporting

confidence: 77%

Section: Resultssupporting

confidence: 57%

Performance Study of MXene/Carbon Nanotube Composites for Current Collector‐ and Binder‐Free Mg–S Batteries

et al. 2021

View full text Add to dashboard Cite

show abstract

“…7 In the other study, the first step was proposed to be a result of S 8 directly reacting with Mg metal. 8 With use of the UPLC-MS technique, we are able to definitively establish that Mg metal must be present for the self-discharge process to begin, at least in an MgTFSI 2 /MgCl 2 based electrolyte.…”

Section: Identifying the First Step In The Mg-s Self-dischargementioning

confidence: 97%

“…Systematic investigations of the self-discharge process in Li-S batteries are numerous, and reveal that self-discharge can exceed 70 % of the cell's capacity if left unchecked. [6][7][8][9][10][11][12][13] Unfortunately, many of the methods by which the self-discharge is disrupted in Li-S cells, such as the use of LiNO 3 to form a protective solid electrolyte interface (SEI) on the anode, are not applicable to Mg-S cells. In other words, solutions for disrupting the metal-sulfur battery discharge must be tailored to each unique chemistry to be effective, underscoring the importance of investigating the self-discharge of Mg-S.…”

Section: Introductionmentioning

confidence: 99%

Self Discharge of Magnesium-Sulfur Batteries Leads to Active Material Loss and Poor Shelf Life

Ford¹,

Doyle²,

He³

et al. 2020

Preprint

View full text Add to dashboard Cite

Due to its high theoretical energy density and relative abundancy of active materials, the magnesium-sulfur battery has attracted research attention in recent years. A closely related system, the lithium-sulfur battery, can suffer from serious self-discharge behavior. Until now, the self-discharge of Mg-S has been rarely addressed, and even then only indirectly. Herein, we demonstrate for a wide variety of Mg-S electrolytes and conditions that Mg-S batteries also suffer from serious self-discharge. For a common Mg-S electrolyte, we identify a multi-step self-discharge pathway. Covalent S8 diffuses to the metal Mg anode and is converted to ionic Mg polysulfide in a non-faradaic reaction. Mg polysulfides in solution are found to be meta-stable, continuing to react and precipitate as solid MgySx species during both storage and active use. Mg-S electrolytes from the early, middle, and state-of-the-art stages of the Mg-S literature are all found to enable the self-discharge. The self discharge behavior is found to decrease first cycle discharge capacity by at least 32 %, and in some cases up to 96 %, indicating this is a phenomenon of the Mg-S chemistry that deserves focused attention.

show abstract

“…Similar to Li–S and RT Na‐S batteries, cathode materials for the advancement of Mg–S cells encompass mainly elemental sulfur incorporated carbonaceous metrics. [ 164 ] So far, various conductive, porous, high‐surface‐area carbon materials have been reported to accommodate the active sulfur in the cathode of K‐S cells toward the improvement of sulfur utilization and the reduction of polysulfides diffusion. These materials include carbon black, [ 83 ] activated carbon clothes, [ 145 ] and metal organic frameworks (MOFs).…”

Section: Advances and The State‐of‐the‐art Of Metal–sulfur Batteriesmentioning

confidence: 99%

A Progress Report on Metal–Sulfur Batteries

Manthiram

2020

Adv Funct Materials

View full text Add to dashboard Cite

Nonaqueous conversion-reaction sulfur chemistry has been attracting increasing attention over the past decade for the development of nextgeneration lithium-based batteries. Li-S batteries are currently approaching a nexus stage from lab-scale experiments to possible pragmatic applications. Inspired by the success of Li-S chemistry, other metal-sulfur batteries with a variety of metallic anodes, such as sodium, potassium, magnesium, calcium, and aluminum, have also started to attract attention. In comparison to lithium, Na, Mg, Al, K, and Ca are naturally more abundant and affordable.

show abstract

Investigation of Magnesium–Sulfur Batteries using Electrochemical Impedance Spectroscopy

Cited by 54 publications

References 55 publications

Performance Study of MXene/Carbon Nanotube Composites for Current Collector‐ and Binder‐Free Mg–S Batteries

Performance Study of MXene/Carbon Nanotube Composites for Current Collector‐ and Binder‐Free Mg–S Batteries

Self Discharge of Magnesium-Sulfur Batteries Leads to Active Material Loss and Poor Shelf Life

A Progress Report on Metal–Sulfur Batteries

Contact Info

Product

Resources

About