Microstructure and Electrochemical Properties of Lithium Titanate Particles Prepared by Solid State Reaction of Li and Spherical TiO₂ Powders

Abstract:

Li₄Ti₅O₁₂ powders were synthesized via the solid state reaction of Li₂CO₃ and spherical composite powders of carbon and TiO₂ (denoted by C/TiO₂) with different microstructures. These C/TiO₂ powders were synthesized by spray pyrolysis using various organic acid aqueous solutions. The particle characteristics of the resulting carbon composite Li₄Ti₅O₁₂ (denoted by C/Li₄Ti₅O₁₂) powders were determined using SEM, XRD, and DTA-TG. DTA-TG showed that the carbon content of all Li₄Ti₅O₁₂ powders. was around 3 wt%. XRD revealed that the spinel structure (Fd3m) was obtained by heating at 750 °C under N₂ atmosphere. The initial rechargeable capacity of the C/Li₄Ti₅O₁₂ powders formed using citric acid was approximately 170 mAh/g at 1 C. The rechargeable capacity of the C/Li₄Ti₅O₁₂ powders decreased with an increase in the rechargeable rate. The anodes maintained over 90% of their initial discharge capacity after 200 cycles at 1 C. The C/Li₄Ti₅O₁₂ powders also demonstrated high cycle stability at 50 °C. It was found that rechargeable capacity was influenced by the particles microstructure, but cycle stability did not depend on the microstructure.

• Periodical: Key Engineering Materials (Volume 566)
• Pages: 107-110
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.566.107
• Online since: July 2013
• Authors: Motofumi Yamada, Hiroshi Kawaguchi, Takayuki Kodera, Takashi Ogihara
• Keywords: Li₄Ti₅O₁₂, Lithium-Ion Battery, Powders, Spinel, Spray Pyrolysis

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