Abstract
Large lithium-ion cells with more than 1200 W/kg power were fabricated using Li 1.1 (Ni 0.025 Ti 0.025 )Mn 1.85 O 4 (LM) and LiNi 0.78 Co 0.19 Al 0.03 M x O 2 (M: Na, Sr, Ba, x = 0.0005-0.1) (LN) as a positive active material, and graphitized carbon (KS25) and meso carbon fiber (MCF) as a negative active material. Overcharge tests at 100 A were carried out to estimate a safety level. From the overcharge test, the safety level of the cells are arranged Cell C (LN/MCF) > Cell A(LM/KS25) > Cell B(LN/KS25). Thermal stability of the active materials are arranged LM > LN as positive, and MCF > KS25 as negative from differential thermal analysis of each material with electrolyte. The safety level of the cells can be explained by the thermal stability of the each active material.
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