Heat transfer enhancement in a lithium-ion cell through improved material-level thermal transport

TitleHeat transfer enhancement in a lithium-ion cell through improved material-level thermal transport
Publication TypeJournal Article
Year of Publication2015
AuthorsVivek Vishwakarma, Chirag Waghela, Zi Wei, Ravi S Prasher, Shrikant C Nagpure, Jianlin Li, Fuqiang Liu, Claus Daniel, Ankur Jain
JournalJ. Power Sources
Date Published12/2015
KeywordsHeat Transfer, Interfacial thermal conductance, Li-ion cell, Thermal management, Thermal runaway

<p><span>While Li-ion cells offer excellent electrochemical performance for several applications including electric vehicles, they also exhibit poor thermal transport characteristics, resulting in reduced performance, overheating and&nbsp;</span><a title="Learn more about thermal runaway" href="https://www.sciencedirect.com/topics/chemistry/thermal-runaway">thermal runaway</a><span><span>. Inadequate heat removal from Li-ion cells originates from poor&nbsp;<a title="Learn more about thermal conductivity" href="https://www.sciencedirect.com/topics/chemistry/thermal-conductivity">the... conductivity</a>&nbsp;within the cell. This paper identifies the rate-limiting material-level process that dominates overall thermal conduction in a Li-ion cell. Results indicate that thermal characteristics of a Li-ion cell are largely dominated by&nbsp;</span><a title="Learn more about heat transfer" href="https://www.sciencedirect.com/topics/chemistry/heat-transfer">heat transfer</a><span><span>&nbsp;across the cathode-separator interface rather than heat transfer through the materials themselves. This interfacial&nbsp;<a title="Learn more about thermal resistance" href="https://www.sciencedirect.com/topics/chemistry/thermal-resistance">thermal resistance</a>&nbsp;contributes around 88% of total thermal resistance in the cell. Measured value of interfacial resistance is close to that obtained from theoretical models that account for weak adhesion and large acoustic mismatch between&nbsp;</span><a title="Learn more about cathode" href="https://www.sciencedirect.com/topics/chemistry/cathode">cathode</a>&nbsp... separator. Further, to address this problem, an amine-based chemical bridging of the interface is carried out. This is shown to result in in four-times lower interfacial thermal resistance without deterioration in electrochemical performance, thereby increasing effective thermal conductivity by three-fold. This improvement is expected to reduce peak temperature rise during operation by 60%. By identifying and addressing the material-level root cause of poor thermal transport in Li-ion cells, this work may contributes towards improved thermal performance of Li-ion cells.</span></span></p>