Thermal reactivity study of spinel lithium titanium oxide material for lithium ion battery by thermal and spectral analysis

This paper reports the study on thermal reactivity of spinel lithium titanium oxide (Li4Ti5O12) material. Thermalgravimetry and Differential scanning calorimetry (TG/DSC) is used to investigate the relevant profiles of Li4Ti5O12 and Li7Ti5O12 electrodes. TG results show Li7Ti5O12 electrode material has higher thermal weight loss, which is 26.7% below 600 °C, significantly larger than that of 20.4% for Li4Ti5O12 electrode. Moreover, the onset exothermal temperature for Li7Ti5O12 electrode material is lower and total exothermal energy is higher. Fourier transform infrared (FT-IR) spectroscopy confirms that more CO group containing compound are generated on Li7Ti5O12 electrode. One species can be decomposed below 460 °C, and the other one can be decomposed below 600 °C. It is conclude that the aforementioned two species leads to higher thermal reaction of Li7Ti5O12 electrode.