Toward Lithium Ion Batteries with Enhanced Thermal Conductivity

Koo, Bonil; Goli, Pradyumna; Sumant, Anirudha V.; Claro, Paula Cecilia dos Santos; Rajh, Tijana; Johnson, Christopher; Balandin, Alexander A.; Shevchenko, Elena V.

doi:10.1021/nn502212b

Cited by 57 publications

(42 citation statements)

References 40 publications

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“…Thermal management is important in the rapid development of batteries, electronic chips, and automobile cooling systems, and minor upgrades in efficiency often bring about great challenges in heat dissipation. Polymer‐based thermal management materials recently have attracted tremendous attention due to their prominent advantages relative to metal or ceramic materials, and the low cost, ease of processing, excellent flexibility, and lightweight cater to emerging technologies such as flexible electronics.…”

mentioning

confidence: 99%

Highly Thermoconductive, Thermostable, and Super‐Flexible Film by Engineering 1D Rigid Rod‐Like Aramid Nanofiber/2D Boron Nitride Nanosheets

et al. 2020

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Polymer‐based thermal management materials have many irreplaceable advantages not found in metals or ceramics, such as easy processing, low density, and excellent flexibility. However, their limited thermal conductivity and unsatisfactory resistance to elevated temperatures (<200 °C) still prevent effective heat dissipation during applications with high‐temperature conditions or powerful operation. Therefore, herein highly thermoconductive and thermostable polymer nanocomposite films prepared by engineering 1D aramid nanofiber (ANF) with worm‐like microscopic morphologies into rigid rod‐like structures with 2D boron nitride nanosheets (BNNS) are reported. With no coils or entanglements, the rigid polymer chain enables a well‐packed crystalline structure resulting in a 20‐fold (or greater) increase in axial thermal conductivity. Additionally, strong interfacial interactions between the weaved ANF rod and the stacked BNNS facilitate efficient heat flux through the 1D/2D configuration. Hence, unprecedented in‐plane thermal conductivities as high as 46.7 W m−1 K−1 can be achieved at only 30 wt% BNNS loading, a value of 137% greater than that of a worm‐like ANF/BNNS counterpart. Moreover, the thermally stable nanocomposite films with light weight (28.9 W m−1 K−1/103 (kg m−3)) and high strength (>100 MPa, 450 °C) enable effective thermal management for microelectrodes operating at temperatures beyond 200 °C.

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mentioning

confidence: 99%

Highly Thermoconductive, Thermostable, and Super‐Flexible Film by Engineering 1D Rigid Rod‐Like Aramid Nanofiber/2D Boron Nitride Nanosheets

et al. 2020

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“…When the cell is not being cooled effectively by external convection, a larger increase in thermal conductivity may be required to influence the thermal runaway behavior of the cell. Some work has been carried out on improving cell thermal conductivity by improving material and interfacial thermal transport . Figure A helps evaluate the actual impact of such improvements on the thermal runaway performance of the cell.…”

Section: Resultsmentioning

confidence: 99%

“…Some work has been carried out on improving cell thermal conductivity by improving material and interfacial thermal transport. 38,39 Figure 5A helps evaluate the actual impact of such improvements on the thermal runaway performance of the cell.…”

Section: Effect Of Heat Transfer Parametersmentioning

confidence: 99%

Prediction of thermal runaway and thermal management requirements in cylindrical Li‐ion cells in realistic scenarios

Shah

Jain

2019

Int J Energy Res

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Summary Li‐ion cells suffer from significant safety and performance problems due to overheating and thermal runaway. Effective thermal management can lead to increased energy conversion efficiency and energy storage density. Critical needs towards these goals include the capability to predict thermal behavior in extreme conditions and determine thermal management requirements to prevent thermal runaway. This paper presents an experimentally validated theoretical model to predict the temperature distribution in a cell in response to nonlinear heat generation rate that is known to occur during thermal runaway. This problem is solved by linearization of the nonlinear term over successive time intervals. Experimental measurements carried out on a thermal test cell in conditions similar to thermal runaway show good agreement with the theoretical model. Experimental measurements and model predictions indicate strong dependence of the fate of the cell on its reaction kinetics, thermal properties, and ambient conditions. Specifically, a sudden change in thermal runaway behavior is predicted once the ambient temperature crosses a certain threshold, consistent with past experimental observations. The impact of increasing cell thermal conductivity on improved thermal runaway performance is quantified. Results presented here provide a fundamental understanding of thermal runaway, and may lead to improved performance and safety of Li‐ion–based energy conversion and storage systems.

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“…Consequently, material-level optimization of thermal transport in a Li-ion cell must focus on this rate-limiting process by improving thermal contact between these two materials. Merely improving material thermal conductivities of separator and/or electrodes without addressing conduction through the interface [37] is unlikely to result in significantly improved overall thermal performance. For example, doubling the separator or cathode thermal conductivity results in only 4.4% and 0.5% reduction in total thermal resistance respectively.…”

Section: Tcr Measurementmentioning

confidence: 99%

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

Vishwakarma

Waghela

et al. 2015

Journal of Power Sources

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h i g h l i g h t sIdentifies rate-limiting material-level thermal conduction process in a Li-ion cell. Shows that interfacial thermal conduction between cathode and separator contributes 88% of total thermal resistance. Experimental data agrees with theoretical model on thermal contact resistance. Chemical bridging of this interface results in 4X reduction in thermal contact resistance. Results may contribute towards thermal safety of Li-ion cells. a b s t r a c tWhile 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 thermal runaway. Inadequate heat removal from Li-ion cells originates from poor thermal conductivity 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 Liion cell are largely dominated by heat transfer across the cathode-separator interface rather than heat transfer through the materials themselves. This interfacial thermal resistance 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 cathode and 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.

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Toward Lithium Ion Batteries with Enhanced Thermal Conductivity

Cited by 57 publications

References 40 publications

Highly Thermoconductive, Thermostable, and Super‐Flexible Film by Engineering 1D Rigid Rod‐Like Aramid Nanofiber/2D Boron Nitride Nanosheets

Highly Thermoconductive, Thermostable, and Super‐Flexible Film by Engineering 1D Rigid Rod‐Like Aramid Nanofiber/2D Boron Nitride Nanosheets

Prediction of thermal runaway and thermal management requirements in cylindrical Li‐ion cells in realistic scenarios

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

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