Facile molten salt synthesis of Li2NiTiO4 cathode material for Li-ion batteries.

Yanming Wang,Yajing Wang,Fei Wang

doi:10.1186/1556-276x-9-197

Yanming Wang, Yajing Wang + Show 1 more

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https://doi.org/10.1186/1556-276x-9-197

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Journal: Nanoscale Research Letters	Publication Date: May 1, 2014
Citations: 27	License type: CC BY 2.0

Affiliation: Huaibei Normal University

Abstract

Well-crystallized Li2NiTiO4 nanoparticles are rapidly synthesized by a molten salt method using a mixture of NaCl and KCl salts. X-ray diffraction pattern and scanning electron microscopic image show that Li2NiTiO4 has a cubic rock salt structure with an average particle size of ca. 50 nm. Conductive carbon-coated Li2NiTiO4 is obtained by a facile ball milling method. As a novel 4 V positive cathode material for Li-ion batteries, the Li2NiTiO4/C delivers high discharge capacities of 115 mAh g-1 at room temperature and 138 mAh g-1 and 50°C, along with a superior cyclability.

Highlights

The growing demand for high-energy Li-ion batteries in the development of portable electronic devices and electric vehicles has stimulated great research interest in advanced cathode materials with high voltage and specific capacity
Substituting Si atom for Ti atom leads to another attractive cathode material of Li2MTiO4 (M = Fe, Mn, Co, Ni) with high theoretical capacity [4]
The chemical valence states of transition metals was analyzed by X-ray photoelectron spectroscopy (XPS) acquired with a Kratos Axis Ultra spectrometer (Axis Ultra DLD, Kratos, Japan) using a monochromatic Al Ka source (1,486.6 eV)

Summary

Introduction

The growing demand for high-energy Li-ion batteries in the development of portable electronic devices and electric vehicles has stimulated great research interest in advanced cathode materials with high voltage and specific capacity. Li2MSiO4 (M = Fe and Mn) has recently attracted particular attention owing to their high theoretical capacities (>330 mAh g−1) and good thermal stability through strong Si-O bond [1,2,3]. Substituting Si atom for Ti atom leads to another attractive cathode material of Li2MTiO4 (M = Fe, Mn, Co, Ni) with high theoretical capacity (approximately 290 mAh g−1) [4]. The reported Li2CoTiO4/C presented a high discharge capacity of 144 mAh g−1 at rate of 10 mA g−1 [8].

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