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Synthesis and Characterization of MgCr2S4 Thiospinel as a Potential Magnesium Cathode

Journal Article · · Inorganic Chemistry
Magnesium-ion batteries are a promising energy storage technology because of their higher theoretical energy density and lower cost of raw materials. Among the major challenges has been the identification of cathode materials that demonstrate capacities and voltages similar to lithium-ion systems. Thiospinels represent an attractive choice for new Mg-ion cathode materials owing to their interconnected diffusion pathways and demonstrated high cation mobility in numerous systems. Reported magnesium thiospinels, however, contain redox inactive metals such as scandium or indium, or have low voltages, such as MgTi2S4. This article describes the direct synthesis and structural and electrochemical characterization of MgCr2S4, a new thiospinel containing the redox active metal chromium and discusses its physical properties and potential as a magnesium battery cathode. However, as chromium(III) is quite stable against oxidation in sulfides, removing magnesium from the material remains a significant challenge. Early attempts at both chemical and electrochemical demagnesiation are discussed.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1573919
Report Number(s):
PNNL-SA-147559
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 57 Vol. 2018
Country of Publication:
United States
Language:
English

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Cited By (2)

MgSc 2 Se 4 —A Magnesium Solid Ionic Conductor for All‐Solid‐State Mg Batteries? journal April 2019
Recent Progress on Layered Cathode Materials for Nonaqueous Rechargeable Magnesium Batteries journal October 2019


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