Lithium Iron Sulfide Research Articles

Exploring the Impact of Oxygen Doping in Li2FeS2 Cathode Materials for Li-Ion Batteries

Over the past few decades, rechargeable lithium-ion batteries have become popular for a variety of applications, such as electric vehicles, smart grids, and portable energy devices. However, due to their limited capacity, stability, and lifespan, they are not suitable for advanced transportation applications. To overcome these challenges, researchers have investigated the use of low-cost, high-energy-density, and safe positive electrode materials for secondary lithium batteries, including lithium iron sulfide. In this particular study, our focus is to investigate the effect of highly electronegative anion doping on the properties of lithium iron sulfide cathode through the solid-state method. Our approach involves using both in-situ and ex-situ observations to establish a correlation between the Redox behavior and structural properties of the prepared cathode materials. We have designed and characterized the material using various techniques, such as X-ray absorption spectroscopy (XAS) and synchrotron-based X-ray diffraction (XRD). Scanning electron microscope (SEM) measurement was conducted to study the morphology of the cathode material. Transmission electron microscopy (TEM) was employed to further study the microstructure of the cathode material at an atomic level. We analyzed the electron density distribution of the modified cathode material using XANES measurement and studied the structural properties through synchrotron-based XRD. Our study has revealed that oxygen-doping helps to improve material stability. As a result, the modified cathode (with optimal oxygen doping) exhibited a 50% capacity enhancement compared to pristine after 100 cycles. We also observed a shift to a higher voltage oxidation plateau of the oxygen-doped cathode material which is due to the influence of anion substitution on the electrochemistry and charge storage mechanisms. In summary, our detailed characterization and experimental results demonstrate the potential of oxygen-doped Li2FeS2 as a promising cathode material for advanced lithium-ion battery applications. The study's detailed characterization and experimental results will be presented, along with future perspectives.

The rate characteristics of lithium iron sulfide

The electrochemical rate properties of Li 2FeS 2 synthesized via a low cost solid state method have been investigated. Apparent diffusion coefficients calculated from EVS and GITT measurements show rate limitations upon charge with distinct differences between the iron redox and sulfur redox regions. These differences between the iron and sulfur redox reactions are not mimicked upon discharge. The apparent diffusion coefficients are greater upon discharge than charge and this is reflected in the rate capabilities as measured by galvanostatic discharge and charge measurements.

The electrochemical insertion and safety properties of the low-cost Li-ion active material, Li 2FeS 2

The electrochemical insertion properties and safety characteristics of the alternative Li-ion positive electrode material, lithium iron sulfide (Li 2FeS 2) are presented. The active material is synthesized by a low cost, proprietary solid-state method. In terms of specific energy, the Li 2FeS 2 material offers a significant advantage over conventional lithium-ion positive electrode materials. The fully de-lithiated (charged) Li 2− x FeS 2 phase also demonstrates outstanding thermal stability suggesting that it may represent an excellent choice for safe, large format Li-ion battery applications.

Lithium Iron Sulfide and Its Rate Characteristics

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Electrochemical properties of Li–Fe–S ternary metal sulfide (lithium iron sulfide) synthesized via the molten salt method

Li–Fe–S ternary metal sulfide (lithium iron sulfide) powder was synthesized by the molten salt method. The physical and electrochemical properties of synthesized lithium iron sulfide were also investigated. From the results of XRD analysis, the chemical composition of synthesized lithium iron sulfide powder was Li1.7Fe1.17S2 with a hexagonal crystal structure. The Li/Li1.7Fe1.17S2 cell showed a first charge capacity of 153 mAh g−1-Li1.7Fe1.17S2, corresponding to 48% of theoretical capacity. To understand the charge/discharge reaction behaviors of the Li/Li1.7Fe1.17S2 cell, Li/FeS2,Li/Fe and Li/AB cells were tested. From these results, the charge/discharge mechanism of the Li/Li1.7Fe1.17S2 cell was suggested.

Lithium iron sulfide as an electrode material in a solid state lithium battery

The electrochemical properties of Li x FeS 2 in a Li + ion conductive glass were investigated. The electrode reaction shows two potential plateaus within the range 0≤ x≤4, and is reversible. The reduction of FeS 2 by 4e − or Li 2FeS 2 by 2e − did not proceed to form Fe metal as reported in earlier studies. Li x FeS 2 is promising as an electrode active material in a solid state lithium battery.

ChemInform Abstract: A NEW MINIATURE LITHIUM‐IRON SULFIDE BATTERY

Chemischer InformationsdienstVolume 15, Issue 48 Physical Inorganic Chemistry ChemInform Abstract: A NEW MINIATURE LITHIUM-IRON SULFIDE BATTERY W. E. AKER, W. E. AKERSearch for more papers by this authorN. MARGALIT, N. MARGALITSearch for more papers by this authorD. P. JOHNSON, D. P. JOHNSONSearch for more papers by this authorR. J. EKERN, R. J. EKERNSearch for more papers by this authorN. A. FLEISCHER, N. A. FLEISCHERSearch for more papers by this authorR. J. BRODD, R. J. BRODDSearch for more papers by this author W. E. AKER, W. E. AKERSearch for more papers by this authorN. MARGALIT, N. MARGALITSearch for more papers by this authorD. P. JOHNSON, D. P. JOHNSONSearch for more papers by this authorR. J. EKERN, R. J. EKERNSearch for more papers by this authorN. A. FLEISCHER, N. A. FLEISCHERSearch for more papers by this authorR. J. BRODD, R. J. BRODDSearch for more papers by this author First published: November 27, 1984 https://doi.org/10.1002/chin.198448017Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume15, Issue48November 27, 1984 RelatedInformation

A New Miniature Lithium‐Iron Sulfide Battery

not Available.

Secondary Batteries for Electrical Energy Storage

Batteries appear to be an ideal companion to coal- and nuclear-derived electrical energy to power vehicles and to play a key role in electrical generation and distribution networks. In certain instances batteries could augment solar-derived electrical energy to attain continuity and reliability of power. The battery systems now under development represent a broad range of possible approaches encompassing extremes of the periodic table, a wide variety of operating temperatures, and limitless design concepts. Along with the substantial international emphasis on battery development, this range of approaches suggests that one or more of the candidate systems can be demonstrated to have commercial viability for electric vehicle (EV) and utility (U) applications. Time frames in which this can occur are: (1) Near Term (before 1985) - Improved Lead-Acid (EV), Nickel-Zinc (EV), and Nickel-Iron (EV); (2) Intermediate Term (1985 to 1990) - Zinc-Chlorine (Utility application (U), EV), and Zinc-Bromine (U,EV); and (3) Long Term (after 1990) - Sodium-Sulfur (U,EV), Lithium-Iron Sulfide (EV), and Redox (U). Even when a potential for commercial viability has been demonstrated, actual implementation will be deterred by high capital cost, substantial commercialization costs, and buyer reluctance. Legislation and/or regulation can change the economics of utility-battery energy storage, and personalmore » inconvenience (rationing or waiting in gas lines) can override the economics of vehicle application. 46 references, 10 figures, 4 tables.« less