Physics

Energy-dispersive X-ray spectroscopy

Nanotechnology

Electrode

Sulfide

Crystallography

Analytical Chemistry (journal)

Crystal structure

Transition metal

Engineering

Catalysis

Transmission electron microscopy

X-ray photoelectron spectroscopy

Physical chemistry

Composite material

Inorganic chemistry

Chemistry

Metallurgy

Materials science

Scanning electron microscope

Spectroscopy

Orthorhombic crystal system

Quantum mechanics

Chemical engineering

Chromatography

Electrochemistry

Biochemistry

Advanced Energy Materials

High‐entropy sulfides (HESs) containing 5 equiatomic transition metals (M), with different M:S ratios, are prepared by a facile one‐step mechanochemical approach. Two new types of single‐phase HESs with pyrite ( Pa ‐3) and orthorhombic ( Pnma ) structures are obtained and demonstrate a homogeneously mixed solid solution. The straightforward synthesis method can easily tune the desired metal to sulfur ratio for HESs with different stoichiometries, by utilizing the respective metal sulfides, even pure metals, and sulfur as precursor chemicals. The structural details and solid solution nature of HESs are studied by X‐ray diffraction, transmission electron microscopy, energy‐dispersive X‐ray spectroscopy, electron energy loss spectroscopy, X‐ray photoelectron spectroscopy, inductively coupled plasma optical emission spectroscopy, and Mössbauer spectroscopy. Since transition metal sulfides are a very versatile material class, here the application of HESs is presented as electrode materials for reversible electrochemical energy storage, in which the HESs show high specific capacities and excellent rate capabilities in secondary Li‐ion batteries.

High‐Entropy Sulfides as Electrode Materials for Li‐Ion Batteries