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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Universal Solution Synthesis of Sulfide Solid Electrolytes Using Alkahest for All-Solid-State Batteries.

Ji Eun Lee1, Kern-Ho Park2, Jin Chul Kim3

  • 1Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, South Korea.

Advanced Materials (Deerfield Beach, Fla.)
|February 23, 2022
PubMed
Summary
This summary is machine-generated.

A new universal solution synthesis method enables the preparation of diverse sulfide solid electrolytes (SEs) for all-solid-state batteries. This breakthrough expands compositional possibilities and demonstrates high ionic conductivity in synthesized SEs.

Keywords:
all-solid-state batteriesinorganic solid electrolytessolution synthesessulfideswet-chemical methods

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Sulfide solid electrolytes (SEs) offer potential for advanced all-solid-state batteries.
  • Current wet-chemical preparation methods for SEs have limitations in precursor scope and composition.
  • Existing techniques include suspension synthesis and solution processes with restricted compositional ranges.

Purpose of the Study:

  • To develop a universal solution synthesis method for preparing a wider range of sulfide solid electrolytes.
  • To investigate the solvent properties enabling the dissolution of diverse sulfide precursors.
  • To demonstrate the efficacy of synthesized SEs in all-solid-state battery applications.

Main Methods:

  • Developed a novel solution process utilizing a mixed solvent of 1,2-ethylenediamine (EDA) and 1,2-ethanedithiol (EDT).
  • Dissolved various sulfide precursors, including Li2S, P2S5, Na2S, LiCl, GeS2, and SnS2, in the EDA-EDT solvent.
  • Employed Raman spectroscopy and theoretical calculations to understand the solvent's interaction with GeS2.
  • Fabricated and tested all-solid-state batteries using the synthesized SEs.

Main Results:

  • The EDA-EDT solvent effectively dissolved a broad spectrum of sulfide precursors, overcoming previous limitations.
  • Raman spectroscopy and calculations indicated strong nucleophilicity of thiolate anions in EDA-EDT, facilitating Ge-S bond dissociation.
  • Synthesized Li10Ge2P12, Li6PS5Cl, and Na11Sn2PS12 exhibited high ionic conductivities (0.74, 1.3, and 0.10 mS cm−1 at 30 °C, respectively).
  • Successful demonstration of these SEs in all-solid-state battery devices.

Conclusions:

  • A universal solution synthesis approach has been established for sulfide solid electrolytes.
  • The unique solvent system expands the compositional flexibility for SE development.
  • The synthesized SEs show promising performance for next-generation all-solid-state batteries.