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All-Solid-State Lithium Battery Working without an Additional Separator in a Polymeric Electrolyte.

Seonggyu Cho1,2, Shinho Kim3, Wonho Kim4

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|April 10, 2019
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Summary
This summary is machine-generated.

This study developed a hybrid solid electrolyte (HSE) for safer all-solid-state lithium batteries. The novel system demonstrates high ionic conductivity and stable performance, even under challenging conditions.

Keywords:
all-solid-state batterylithium(trifluoromethanesulfonyl)imide (LiTFSI)secondary Li ion batterysolid polymer electrolytesuccinonitrile (SN)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Safety concerns with traditional Li ion batteries necessitate advanced solid-state electrolytes.
  • Achieving high Li ion conductivity (>1 mS/cm) in solid electrolytes remains a significant challenge.
  • Polyethylene oxide (PEO) solid electrolytes suffer from high crystallinity, limiting their practical application.

Purpose of the Study:

  • To design and evaluate hybrid solid electrolyte (HSE) systems for all-solid-state lithium batteries.
  • To improve the ionic conductivity and electrochemical stability of solid polymer electrolytes.
  • To develop a safe and practical all-solid-state Li battery by addressing PEO crystallinity and cell integrity.

Main Methods:

  • Hybrid solid electrolyte (HSE) systems were synthesized using Li1.3Al0.3Ti0.7(PO₄)₃ (LATP), PEO, and LiTFSI.
  • A hybrid solid cathode (HSC) was developed using LATP, PEO, LiCoO₂, and LiMn₂O₄.
  • Succinonitrile (SN) was incorporated as a plasticizer to reduce PEO crystallinity.

Main Results:

  • The HSE system achieved Li ion conductivities of 2.0 × 10-4 S/cm at 23 °C and 1.6 × 10-3 S/cm at 55 °C.
  • The system exhibited 6.0 V electrochemical stability without requiring an additional separator.
  • The HSC/HSE/Li metal cell demonstrated stable operation, even under a broken cell condition, with initial charge capacities of 82/62 mAh/g (23 °C) and 123.4/102.7 mAh/g (55 °C).

Conclusions:

  • The developed hybrid solid electrolyte and cathode system offers a promising solution for safe all-solid-state lithium batteries.
  • Incorporating succinonitrile effectively reduced PEO crystallinity, enhancing practical applicability.
  • The system overcomes limitations like internal resistance and demonstrates potential for commercial product development.