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Structural Aspects of Lithium-Ion Conduction in the Phosphidotitanate Li<sub>8</sub>TiP<sub>4</sub> and Its Comparison With Li<sub>7+5</sub> <sub>x</sub>Ta<sub>1-</sub> <sub>x</sub>P<sub>4</sub> and Li<sub>8-</sub> <sub>x</sub>Ti<sub>1-</sub> <sub>x</sub>Ta<sub>x</sub>P<sub>4</sub>.

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Published on: August 12, 2013

Fast Lithium Ion Conduction in Lithium Phosphidoaluminates.

Tassilo M F Restle¹, Christian Sedlmeier², Holger Kirchhain³

¹Department of Chemistry, Chair for Inorganic Chemistry with Focus on New Materials, Technische Universität München, Lichtenbergstraße 4, 85747, Garching, Germany.

Angewandte Chemie (International Ed. in English)

|December 12, 2019

Summary

Researchers developed a new superionic conductor, Li9AlP4, for all-solid-state batteries. This material offers fast lithium-ion conductivity and low density, crucial for safer, high-energy batteries.

Keywords:

all-solid-state batteries impedance spectroscopy lithium solid electrolytes solid-state structures

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Area of Science:

Materials Science
Electrochemistry
Solid-State Chemistry

Background:

Solid electrolyte materials are essential for developing high-energy-density all-solid-state batteries (ASSBs).
Fast lithium-ion conducting solid electrolytes are needed to minimize lithium-ion transfer resistance in ASSBs.
Nonflammable electrolytes are critical for battery safety.

Purpose of the Study:

To report on a novel superionic conductor, Li9AlP4, for potential use in all-solid-state batteries.
To investigate the synthesis, structure, and ionic conductivity of Li9AlP4.
To analyze the lithium atom distribution within the crystal structure.

Main Methods:

Synthesis via ball-milling and annealing.
Characterization using single-crystal and powder X-ray diffraction.
Measurement of ionic conductivity and activation energy via impedance spectroscopy.
Analysis of lithium motion using temperature-dependent 7Li NMR spectroscopy.
Density functional theory (DFT) calculations for atom distribution analysis.

Main Results:

Li9AlP4 was synthesized easily from elements.
The material exhibits a remarkable ionic conductivity of 3 mS/cm as an undoped compound.
Low activation energy of 29 kJ/mol was determined.
High lithium content and a very low theoretical density (1.703 g/cm³) were observed.
NMR spectroscopy confirmed fast lithium ion motion.

Conclusions:

Li9AlP4 is a promising novel superionic conductor for all-solid-state batteries.
Its properties, including high conductivity and low density, make it suitable for advanced battery applications.
The material class of lithium phosphidoaluminates warrants further investigation for battery development.