Abstract
Effective thermal management is an important issue to ensure safety and performance of lithium-ion batteries. Fast heat removal is highly desired but has been obstructed by the high thermal resistance across cathode/electrolyte interface. In this study, self-assembled monolayers (SAMs) are used as the vibrational mediator to tune interfacial thermal conductance between an electrode, lithium cobalt oxide (LCO), and a solid state electrolyte, polyethylene oxide (PEO). Embedded at the LCO/PEO interface, SAMs are specially designed to form hierarchical hydrogen-bond (H-bond) network with PEO. Molecular dynamics simulations demonstrate that all SAM-decorated interfaces show enhanced thermal conductance and dominated by H-bonds types. The incorporation of poly(acrylic acid) (PAA) SAM drastically enhances interfacial thermal conductance by approximately 211.69%, largely due to the formation of a strong H-bond, -COOH···:O, between PAA and PEO. Even with weaker H-bonds such as -OH···:O, it still outperforms the pristine interface as well as interfaces decorated with non-H-bonded SAMs, e.g. PE. Such improvement is attributed to the unique hierarchical H-bond network at the interface, which removes discontinuities in temperature field, straighten SAM chains, make materials strongly adhere, and couple the vibrational modes of materials. The study is expected to guide surface engineering for more effective thermal management in lithium-ion batteries.
Highlights
Solid-state lithium-ion batteries have been widely employed for applications including consumer electronics and electric vehicles for their high energy density, specific capacity and credible life [1,2]
This study aims to reduce thermal resistance across the cathode/ electrolyte interface by incorporating a hierarchical network of Hbonds enabled by polymeric self-assembled monolayers (SAMs)
polyethylene oxide (PEO) interface calculated by the reverse non-equilibrium molecular dynamics (RNEMD) method was found almost the same as that obtained by the non-equilibrium molecular dynamics (NEMD) method, with a minor difference of 8.45%
Summary
Solid-state lithium-ion batteries have been widely employed for applications including consumer electronics and electric vehicles for their high energy density, specific capacity and credible life [1,2]. As batteries are in operation, heat builds up and if not dissipated efficiently, it may cause overheating leading to lower electrochemical performance and even thermal runway [4,5,6,7,8]. To address this issue, several methods have been proposed including overdesigning, less operation and reducing interfacial impedance by thermal treatment to keep the battery temperature below the design limit. These approaches inevitably reduce the efficiency or increase the cost of batteries
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