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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Ceramic-Based Flexible Sheet Electrolyte for Li Batteries.

Eric Jianfeng Cheng1, Takeshi Kimura1, Mao Shoji1

  • 1Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.

ACS Applied Materials & Interfaces
|February 6, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a flexible Al-doped Li7La3Zr2O12 (Al-LLZO) solid-state electrolyte. This material can be mass-produced at room temperature, enabling practical lithium-metal batteries at moderate temperatures.

Keywords:
Li-metal batteriesLi7La3Zr2O12activation energyflexible electrolyteionic liquidquasi-solid electrolyteroom-temperature synthesis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • High-energy-density batteries are crucial for modern technology, driving renewed interest in lithium-metal batteries.
  • Garnet-type Li7La3Zr2O12 (LLZO) is a promising solid-state electrolyte due to its stability against lithium metal.
  • Conventional LLZO processing requires high temperatures (1200 °C), leading to Li loss, side reactions, and challenges in large-scale manufacturing of thin, brittle electrolytes.

Purpose of the Study:

  • To develop a practical synthesis method for LLZO-based solid-state electrolytes.
  • To overcome the limitations of high-temperature sintering and interfacial resistance in LLZO electrolytes.
  • To demonstrate the feasibility of flexible LLZO electrolytes for practical lithium-metal battery applications.

Main Methods:

  • Synthesis of a flexible composite Al-doped LLZO (Al-LLZO) sheet electrolyte.
  • Achieving mass production of the Al-LLZO electrolyte at room temperature.
  • Fabrication and testing of lithium-metal batteries utilizing the flexible Al-LLZO electrolyte.

Main Results:

  • A flexible Al-LLZO sheet electrolyte with a thickness of 75 μm was successfully synthesized.
  • The Al-LLZO electrolyte was produced via a room-temperature mass-production method.
  • Lithium-metal batteries employing the flexible Al-LLZO electrolyte demonstrated successful operation at both 60 °C and 30 °C.

Conclusions:

  • A novel, flexible Al-LLZO composite sheet electrolyte can be mass-produced at room temperature.
  • This flexible electrolyte addresses the challenges of high-temperature processing and interfacial resistance associated with traditional LLZO electrolytes.
  • The developed Al-LLZO electrolyte shows significant potential for enabling practical, moderate-temperature operation of lithium-metal batteries.