Nanotechnology

Electrode

Ethylene oxide

Sulfide

Mathematics

Dendrite (mathematics)

Dissolution

Endocrinology

Engineering

Physical chemistry

Copolymer

Composite material

Inorganic chemistry

Chemistry

Metallurgy

Materials science

Geometry

Lithium (medication)

Layer (electronics)

Oxide

Metal

Electrolyte

Chemical engineering

Polymer

Electrochemistry

Medicine

Advanced Materials

An ultrastable and kinetically favorable interface is constructed between sulfide-poly(ethylene oxide) (PEO) composite solid electrolytes (CSEs) and lithium metal, via in situ formation of a solid electrolyte interphase (SEI) layer containing Li3 PS4 . A specially designed sulfide, lithium polysulfidophosphate (LPS), can distribute uniformly in the PEO matrix via a simple stirring process because of its complete solubility in acetonitrile solvent, which is advantageous for creating a homogeneous SEI layer. The CSE/Li interface with high Li+ transportation capability is stabilized quickly through in situ formation of a Li3 PS4 /Li2 S/LiF layer via the reaction between LPS and lithium metal to inhibit lithium dendrite growth. A Li/Li symmetric cell with the LPS-integrated CSE exhibits constant and small CSE/Li resistance of 10 Ω cm2 during cycling, delivering stable cycling for 3475 h at a current density of 0.2 mA cm-2 and a high critical current density of 0.9 mA cm-2 at 60 °C. Impressive electrochemical performance is also demonstrated for LiFePO4 /CSE/Li all-solid-state batteries with capacity of 127.6 mAh g-1 after 1000 cycles at 1 C.

Long‐Life Lithium‐Metal All‐Solid‐State Batteries and Stable Li Plating Enabled by In Situ Formation of Li<sub>3</sub>PS<sub>4</sub> in the SEI Layer

Long‐Life Lithium‐Metal All‐Solid‐State Batteries and Stable Li Plating Enabled by In Situ Formation of Li3PS4 in the SEI Layer

Long‐Life Lithium‐Metal All‐Solid‐State Batteries and Stable Li Plating Enabled by In Situ Formation of Li₃PS₄ in the SEI Layer