Phase Equilibria in Lithium-Chalcogen Systems

Cunningham, P.T.; Johnson, S. A.; Cairns, Elton J.

doi:10.1149/1.2404020

Cited by 55 publications

(41 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While GeS 2 glass powder is verified to be amorphous, Li 2 S powder shows several sharp peaks. The XRD pattern of the Li 2 S powder closely matches the JCPDS data (Cunningham et al, 1972). From the JCPDS data, it is verified that the system and space group of Li 2 S powder are face-centered cubic and Fm-3m, respectively (Cunningham et al, 1972 Li 4 GeS 4 reference (Komiya et.…”

Section: X-ray Diffraction Of the Starting Materials And Targetssupporting

confidence: 67%

New Developments in Solid Electrolytes for Thin-Film Lithium Batteries

Seo¹,

Martin²

2012

Lithium Ion Batteries - New Developments

View full text Add to dashboard Cite

Section: X-ray Diffraction Of the Starting Materials And Targetssupporting

confidence: 67%

New Developments in Solid Electrolytes for Thin-Film Lithium Batteries

Seo¹,

Martin²

2012

Lithium Ion Batteries - New Developments

View full text Add to dashboard Cite

“…Although we also attempted to synthesize Li 2 S 4 powder, it could not be isolated, because it is thermodynamically unstable. 27,40 Since the XANES features of Na 2 S 4 (27,28) are similar to the predicted features of lithium polysulfides, 29 it is a suitable reference for a qualitative analysis.…”

Section: Methodsmentioning

confidence: 87%

Operando Characterization of Intermediates Produced in a Lithium-Sulfur Battery

Gorlin

Siebel

Piana

et al. 2015

J. Electrochem. Soc.

105

156

View full text Add to dashboard Cite

One of the technological barriers to electrification of transport is the insufficient storage capacity of the Li-ion batteries on which the current electric cars are based. The lithium-sulfur (Li-S) battery is an advanced technology whose successful commercialization can lead to significant gains in the storage capacity of batteries and promote wide-spread adoption of electric vehicles. Recently, important Li-S intermediates, including polysulfides, S 3•-, and Li 2 S, have been shown to present unique X-ray absorption near edge structure (XANES) features at the sulfur K-edge. As a result, a combination of XANES characterization with electrochemistry has the potential to contribute to the understanding of Li-S chemistry. In this study, we present an operando XANES cell design, benchmark its electrochemical and spectroscopic performance, and use it to track reaction intermediates during the discharge of the battery. In particular, by employing electrolyte solvents with either a high or a low dielectric constant, we investigate the influence of the solvent on the conversion of polysulfide species to Li 2 S. Our results reveal that Li 2 S is already formed after ∼25-30% discharge in both types of electrolyte solvents, but that further conversion of polysulfides to Li 2 S proceeds more rapidly in a solvent with a low dielectric constant. Electric vehicles represent a promising alternative to conventional transport based on an internal combustion engine and, when combined with renewable energy sources, have the potential to decrease worldwide CO 2 emissions by 20-30%.1,2 In recent years, they have been gaining popularity in the form of passenger cars, with the number of sold units surpassing the 100,000 mark in 2012.2 One of the main technological barriers to an even wider adoption of electric cars and a complete displacement of the CO 2 -emitting vehicles is the insufficient storage capacity of the current battery technology, which leads to a limited vehicle driving range.2,3 The useable energy density of state-of-the-art lithium-ion batteries employed in recent electric vehicles amounts to only ≈120 Wh/kg system , 4 which corresponds to a practical driving range of 150-200 km. If one succeeds in the development of sufficiently durable high-voltage or high-energy cathode materials and combines them with silicon anodes, an energy density of ≈250 Wh/kg system would be in reach. 4 An alternative promising battery concept is the lithium-sulfur (Li-S) battery.3,5-7 Current development in Li-S battery research includes successful commercialization of Li-S cells with 260 Wh/kg system energy density by Sion Power corporation.8 This value already exceeds the DOE target for 2022 (250 Wh/kg system ) 9 and has the potential to also comply with the system cost target of 125 USD/kWh 9 because of the abundance and low cost of sulfur. To achieve even greater gains in the performance and, most importantly, to improve the cycle life of Li-S batteries, it will be necessary to gain a deeper mechanistic understanding of the 16 e -/S 8 in...

show abstract

“…It was reported that Li could react with sulfur to form Li 2 S n (n=1,2,...) [11]. The discharge behavior might be related with the formation of Li 2 S, which is a stable phase between Li and S [19].…”

Section: Resultsmentioning

confidence: 99%

Effect of sulfur electrode composition on the electrochemical property of lithium/PEO/sulfur battery

et al. 2004

View full text Add to dashboard Cite

The lithium/sulfur cell is very attractive because of its high theoretical specific capacity and low production cost. The sulfur electrode is prepared from sulfur, with carbon as an electronic conductor and PEO as an ionic conductor. We changed the carbon content of a 50 wt.% sulfur electrode from 10 wt.% to 40 wt.%. The lithium/PEO/sulfur cell showed two plateau potential regions (2.4 V, 2.1 V) and high discharge capacity, i.e., 1484 mAh/g (88 % utilization) for optimum composition. The discharge capacity decreased drastically by charge-discharge cycling. The degradation rate as well as the first discharge capacity depended on the composition of the sulfur electrode. The optimum composition of the 50 wt.% sulfur electrode was 30 wt.% carbon and 20 % PEO.

show abstract

Phase Equilibria in Lithium-Chalcogen Systems

Cited by 55 publications

References 6 publications

New Developments in Solid Electrolytes for Thin-Film Lithium Batteries

New Developments in Solid Electrolytes for Thin-Film Lithium Batteries

Operando Characterization of Intermediates Produced in a Lithium-Sulfur Battery

Effect of sulfur electrode composition on the electrochemical property of lithium/PEO/sulfur battery

Contact Info

Product

Resources

About