Wang QS, Sun JH, Yao XL, Chen CH (2006f) Thermal behavior of lithiated graphite with electrolyte in lithium-ion batteries. Journal of the Electrochemical Society 153(2), A329-A333. [In English]

Web link:http://dx.doi.org/10.1149/1.2139955

Keywords:

accelerating rate calorimetry, elevated-temperature, natural graphite, intercalated graphite, exothermic reactions, surface-chemistry, passivation layer, electric vehicles, anode materials, high-power,

Abstract: A C80 calorimeter was used to study the thermal behaviors of LixC6 and LixC6 in 1.0 M LiPF6/EC + DEC electrolyte. C80 results show that LixC6 alone shows one exothermic peak, which is attributed to the solid electrolyte interphase (SEI) decomposition. Four exothermic peaks were detected in LixC6-1.0 M LiPF6/EC + DEC electrolyte samples. These four peaks are attributed to SEI decomposition, Li-electrolyte reaction as well as new SEI film formation, new SEI film decomposition, and Li with PVDF/other products reactions. The apparent activation energy of LixC6 and LixC6-electrolyte at different states of charge was calculated, and it was found that with intercalated lithium increasing, the activation energy shows a decreasing trend. (c) 2005 The Electrochemical Society. [DOI: 10.1149/1.2139955] All rights reserved.