NDLI: In situ analysis of high temperature characteristics of prismatic polymer lithium

Content Provider	Springer Nature Link
Author	Mohamedi, Mohamed Ishikawa, Hiroaki Uchida, Isamu
Copyright Year	2004
Abstract	A systematic approach to understanding the safety fundamentals of Li-ion batteries was undertaken. Firstly, we present thermal characterization experiments of charged prismatic polymer lithium-ion batteries (PLBs). These cells, at different state of charge (SOC), were tested inside an accelerated rate calorimeter (ARC) to determine the onset-of-thermal runaway (OTR) temperatures. In addition, the thermally activated components of these cells were followed by monitoring both the impedance (at 1 kHz) and the open circuit voltage (OCV) as a function of temperature. An increase in the impedance was observed at around 133 °C corresponding to the polyethylene separator shutdown. Secondly, an original in situac impedance measurement was performed over a wide range of frequencies instead of 1 kHz when the battery was heated from ambient to 130 °C. Resulting impedance spectra were modeled using an appropriate equivalent circuit. It is concluded that the high frequency and the low frequency semicircles observed in the impedance spectra are due to processes occurring the anode/electrolyte and cathode/electrolyte interfaces, respectively. The activation energy E $_{a}$ was found in the ranges of 0.4–0.6 and 0.36–0.53 eV, for cathode and anode processes, respectively. In addition, it is assumed that change in the electrolyte composition is the main factor responsible for the rise in the cell impedance at high temperatures.
Starting Page	1103
Ending Page	1112
Page Count	10
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	34
Issue Number	11
e-ISSN	15728838
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Electrochemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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