Safety Characteristics of the Li₄Ti₅O₁₂/LiMn₂O₄ Li-Ion Battery

Ilias Belharouak, Wenquan Lu, and Khalil Amine

Chemical Sciences and Engineering Division, Argonne National Laboratory

Abstract

Li₄+xTi₄O₁₂ and Li_1-yMn₂O₄ materials have been respectively prepared by a chemical lithiation of Li₄Ti₄O₁₂ in the presence of an excess of butylithium (LiC₄H₉) in hexane solution and chemical delithiation of LiMn₂O₄ spinel using NO₂BF₄ oxidizer in an acetonitrile medium. The thermal gravimetric results show that Li_1-yMn₂O₄ releases oxygen starting from 200^oC with an overall oxygen loss of 6 wt% at 500^oC, whereas Li₄+xTi₄O₁₂ gains oxygen starting from 200^oC with an overall oxygen gain of 4 wt % at 500^oC. The reactivity of the Li₄+xTi₄O₁₂ and Li_1-yMn₂O₄ powders in the presence of electrolytes was investigated by a differential scanning calorimetry (DSC) between room temperature and 375^oC, and compared to a lithiated graphite in the case of the Li₄+xTi₄O₁₂ negative electrode material.

In Solid-State Ionics—2006, edited by Enrico Traversa, Timothy R. Armstrong, Christian Masquelier, and Yoshihiko Sadaoka (Mater. Res. Soc. Symp. Proc. 972, Warrendale, PA, 2007), 0972-AA13-04
©Materials Research Society 2007