Effect of oleic acid coating on electrochemical properties of Li 4Ti5O12 nanofiber for anode materials

Eun Kyung Kim, Byung Hyun Choi, Mi Jung Ji, Sung Hun Jung, Kwang Bum Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

For preparing spinel Li4Ti5O12 nanofiber, a hydrogen titanate nanofiber precursor was mixed with Li0H·H 20 and then the mixture was treated at 130°C in an autoclave for 24 hrs. The hydrogen titanate nanofiber precursor was made using a TiO 2 and NaOH solution as the starting material. As a result, the diameter of the Li4Ti5O12 nanofiber was 5-10nm and the length was over 100 nm longer fiber. The oleic acid (C 17H33COOH) coated Li4Ti5O 12 nanofiber with different oleic acid contents (5, 7.5, and 10 wt%) was obtained by a simple mixing method and heat treatment at 450°C in a N2 atmosphere. The results clearly revealed that the surface of the Li4Ti5O12 nanofiber was coated with an amorphous carbon layer (1 nm). The crystallinity of the samples was also enhanced. The oleic acid coated Li4Ti5O12 nanofiber (5 wt% and 7.5 wt%) displayed a much lower impedance than the Li 4Ti5O12 nanofiber because of the decreased charge transfer resistance, therefore, it had an improved discharging/charging capacity, c-rate and cycle performance.

Original languageEnglish
Pages (from-to)227-232
Number of pages6
JournalJournal of Korean Institute of Metals and Materials
Volume51
Issue number3
DOIs
Publication statusPublished - 2013 Mar 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Modelling and Simulation
  • Surfaces, Coatings and Films
  • Metals and Alloys

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