Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jpowsour.2016.08.045
Title: Heat loss distribution: Impedance and thermal loss analyses in LiFePO4/graphite 18650 electrochemical cell
Authors: Balasundaram, Manikandan 
Ramar, Vishwanathan 
Yap, Christopher 
Li, Lu
Tay, Andrew AO 
Balaya, Palani 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Electrochemistry
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
Thermal loss
Calorimetry
Reversible heat
Irreversible heat
Impedance
Internal resistance
LITHIUM-ION BATTERIES
POLYMER BATTERIES
CATHODE MATERIALS
DIFFERENT STATES
CHARGE
DISCHARGE
ELECTRODE
BEHAVIOR
LIFEPO4
CALORIMETER
Issue Date: 1-Oct-2016
Publisher: ELSEVIER SCIENCE BV
Citation: Balasundaram, Manikandan, Ramar, Vishwanathan, Yap, Christopher, Li, Lu, Tay, Andrew AO, Balaya, Palani (2016-10-01). Heat loss distribution: Impedance and thermal loss analyses in LiFePO4/graphite 18650 electrochemical cell. JOURNAL OF POWER SOURCES 328 : 413-421. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jpowsour.2016.08.045
Abstract: We report here thermal behaviour and various components of heat loss of 18650-type LiFePO4/graphite cell at different testing conditions. In this regard, the total heat generated during charging and discharging processes at various current rates (C) has been quantified in an Accelerating Rate Calorimeter experiment. Irreversible heat generation, which depends on applied current and internal cell resistance, is measured under corresponding charge/discharge conditions using intermittent pulse techniques. On the other hand, reversible heat generation which depends on entropy changes of the electrode materials during the cell reaction is measured from the determination of entropic coefficient at various states of charge/discharge. The contributions of irreversible and reversible heat generation to the total heat generation at both high and low current rates are evaluated. At every state of charge/discharge, the nature of the cell reaction is found to be either exothermic or endothermic which is especially evident at low C rates. In addition, electrochemical impedance spectroscopy measurements are performed on above 18650 cells at various states of charge to determine the components of internal resistance. The findings from the impedance and thermal loss analysis are helpful for understanding the favourable states of charge/discharge for battery operation, and designing better thermal management systems.
Source Title: JOURNAL OF POWER SOURCES
URI: https://scholarbank.nus.edu.sg/handle/10635/194160
ISSN: 03787753
18732755
DOI: 10.1016/j.jpowsour.2016.08.045
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