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Layered titanium sulfide cathode for all-solid-state magnesium batteries

DOI: 10.1002/batt.202300185 DOI Help

Authors: Lasse N. Skov (Aarhus University) , Jakob B. Grinderslev (Aarhus University) , Torben R. Jensen (Aarhus University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Batteries & Supercaps

State: Published (Approved)
Published: June 2023

Open Access Open Access

Abstract: Magnesium solid-state batteries attract significant attention as a future mean of energy storage. Here we present the first cathode study of an inorganic all-solid-state magnesium battery using a magnesium metal anode, a nanocomposite electrolyte Mg(BH4)2·1.6NH3-MgO(75 wt%), and a layered titanium disulfide (TiS2) as cathode active material. The structural transformations of TiS2 particles with different size are investigated at different stages of battery life. Reversible Mg2+ intercalation occurs via three structurally distinct phases of MgxTiS2, identified by powder X-ray diffraction. Magnesium intercalates initially on octahedral sites and at higher depth of discharge on tetrahedral sites in the interlayers of TiS2, which leads to an expansion initially mainly along the c-axis and later along both the a- and c-axes. A maximum discharge capacity of 172 mAh g-1 (Δx = 0.36 in MgxTiS2) is observed for smaller TiS2 particles. Parasitic reactions could be reduced by decreasing the cut-off voltage by a constant current constant voltage cycling procedure. The chemical diffusion coefficient of the entire cell is found from galvanostatic intermittent titration technique experiments to be in the order of 10-15 to 10-19 cm2 s-1.

Journal Keywords: solid-state magnesium batteries; magnesium titanium disulfide; magnesium cathode; magnesium metal anode

Diamond Keywords: Batteries; Magnesium-ion; Solid-State Batteries (SSB)

Subject Areas: Chemistry, Materials, Energy

Instruments: I11-High Resolution Powder Diffraction

Added On: 08/06/2023 09:13

Batteries Supercaps - 2023 - Skov - Layered Titanium Sulfide Cathode for All%E2%80%90Solid%E2%80%90State Magnesium Batteries.pdf

Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags:

Diffraction X-ray Powder Diffraction