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Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

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Open-Structured Nanotubes with Three-Dimensional Ion-Accessible Pathways for Enhanced Li⁺ Conductivity in Composite

Song Hu¹, Lulu Du¹, Gang Zhang¹

¹State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, P. R. China.

ACS Applied Materials & Interfaces

|March 10, 2021

Summary

Open-structured lithium lanthanum titanium oxide (LLTO) nanotubes enhance composite solid electrolytes for safer, high-energy lithium metal batteries. This novel filler design improves ionic conductivity and battery stability.

Keywords:

composite solid electrolytes nanoparticles nanotubes polyacrylonitrile room temperature

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Synthesis and Characterization of Fe-doped Aluminosilicate Nanotubes with Enhanced Electron Conductive Properties

Synthesis and Characterization of Fe-doped Aluminosilicate Nanotubes with Enhanced Electron Conductive Properties

Published on: November 15, 2016

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Composite solid electrolytes (CSEs) are crucial for developing safe and high-energy-density lithium metal batteries.
Improving ionic transport in CSEs is key, with filler nanostructure design being a critical research area.
Existing fillers like nanoparticles and nanowires have limitations in optimizing ion conduction pathways.

Purpose of the Study:

To fabricate and investigate open-structured lithium lanthanum titanium oxide (LLTO) nanotubes as novel ion-conductive fillers for CSEs.
To evaluate the performance enhancement of CSEs incorporating LLTO nanotubes compared to traditional filler morphologies.
To demonstrate the potential of LLTO nanotubes for high-performance solid-state batteries.

Main Methods:

Fabrication of open-structured LLTO nanotubes using a gradient electrospinning method.
Incorporation of LLTO nanotubes into a polyacrylonitrile (PAN) polymer matrix to form CSEs.
Characterization of ionic conductivity, electrochemical window, and long-term cycling stability in Li-Li symmetric and LiFePO4-Li full cells.

Main Results:

LLTO nanotubes provide 3D Li+-accessible pathways, enhancing interfacial ionic conduction and polymer wettability.
CSEs with LLTO nanotubes achieved high ionic conductivity (3.6 × 10⁻⁴ S cm⁻¹) and a wide electrochemical window (5 V) at room temperature.
Li-Li symmetric cells demonstrated stable cycling over 1000 hours, and LiFePO4-Li full cells showed high capacity retention (90% at 0.5 C after 100 cycles).

Conclusions:

Open-structured nanotubes represent a promising filler design for significantly improving the performance of CSEs.
The developed LLTO NTs/PAN CSE offers a viable pathway towards safer and more efficient solid-state lithium metal batteries.
This work highlights the importance of rational nanostructure design in advancing solid electrolyte technology.