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A Surface Coordination Interphase Stabilizes a Solid-State Battery.

Ya-Nan Yang1,2, Fang-Ling Jiang1, Yi-Qiu Li1

  • 1State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, P. R. China.

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|July 19, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel interface for solid-state batteries using nitrile chemistry. This enhances electrolyte/electrode contact, improving safety and performance in solid-state electrolytes (SSEs).

Keywords:
charge transfergarnet electrolytepolymerizationsolid-state batteriessurface coordination

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Batteries

Background:

  • Solid-state electrolytes (SSEs) offer enhanced safety over liquid electrolytes in batteries.
  • Poor interfacial contact between SSEs and electrodes limits practical application of solid-state batteries (SSBs).

Purpose of the Study:

  • To investigate the coordination chemistry of nitrile groups on the surface of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) SSE.
  • To engineer a stable and conductive interface for improved SSBs.

Main Methods:

  • Studied coordination chemistry of succinonitrile (SCN) and polyacrylonitrile (PAN) on LLZTO SSE surface.
  • Fabricated a deformable PAN-modifying SCN electrolyte (PSE) interphase.
  • Evaluated ionic conductivity, lithium-ion transference number, and interface resistance.

Main Results:

  • Clarified the coordination mechanism between nitrile groups and LLZTO.
  • Achieved a PSE interphase with ionic conductivity of 10⁻⁴ S cm⁻¹ and a high lithium-ion transference number of 0.66.
  • Demonstrated low interface resistance and strong electrolyte/electrode bonding in SSBs.

Conclusions:

  • The developed PSE interphase significantly improves interface contact in SSBs.
  • The modified LLZTO SSE exhibits excellent electrochemical performance, including 95.6% initial Coulomb efficiency and 99% capacity retention after 250 cycles at 25°C.