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Pseudo-binary electrolyte, LiBH4-LiCl, for bulk-type all-solid-state lithium-sulfur battery.

Atsushi Unemoto1, ChunLin Chen, Zhongchang Wang

  • 1WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.

Nanotechnology
|June 5, 2015
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Summary
This summary is machine-generated.

This study explores a novel solid-state electrolyte for lithium-sulfur batteries. The LiBH4-LiCl electrolyte demonstrates excellent ionic conductivity and stability, enabling high discharge capacities in all-solid-state battery prototypes.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • All-solid-state lithium-sulfur batteries offer enhanced safety and energy density compared to traditional lithium-ion batteries.
  • Development of stable solid-state electrolytes with high ionic conductivity is crucial for practical applications.
  • Lithium borohydride (LiBH4) and lithium chloride (LiCl) composites show promise as solid-state electrolytes.

Purpose of the Study:

  • To investigate the ionic conduction, electrochemical stability, and thermal stability of the LiBH4-LiCl solid-state electrolyte.
  • To evaluate the performance of this electrolyte in bulk-type all-solid-state lithium-sulfur batteries.
  • To understand the interfacial properties between the electrolyte and electrode materials.

Main Methods:

  • High-energy mechanical ball-milling was used to prepare a composite powder of elemental sulfur and conductive additives (Ketjen black, Maxsorb).
  • The LiBH4-LiCl solid-state electrolyte was synthesized and characterized for its ionic conductivity and electrochemical potential window.
  • All-solid-state lithium-sulfur battery cells were assembled using the prepared materials and tested at 373 K.

Main Results:

  • The LiBH4-LiCl electrolyte exhibited a lithium ionic conductivity of [Formula: see text] at 373 K.
  • A reversible interface was formed between the electrolyte and a lithium metal electrode, with an electrochemical potential window up to 5 V.
  • The nanometer-scale dispersion of sulfur and carbon additives in the composite powder enhanced sulfur electrochemical reactions.
  • The battery achieved high discharge capacities: 1377 mAh g(-1) (1st), 856 mAh g(-1) (2nd), and 636 mAh g(-1) (5th) at 373 K.

Conclusions:

  • The LiBH4-LiCl solid-state electrolyte is a promising candidate for bulk-type all-solid-state lithium-sulfur batteries.
  • The electrolyte's deformability facilitates tight interfacial contact with the sulfur-carbon composite, enabling efficient Li-ion transport.
  • Complex hydride-based solid-state electrolytes containing Cl-ions are viable for rechargeable battery integration.