Competing Heat Carriers Leading to Distinctive Cation Concentration Dependent Thermal Conductivity of Amorphous Li_xS (x = 0–2) Batteries

Yufei Gao; Hongzhao Fan; Yanguang ZhouMing Hu

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Competing Heat Carriers Leading to Distinctive Cation Concentration Dependent Thermal Conductivity of Amorphous Li_xS (x = 0–2) Batteries

机译：Competing Heat Carriers Leading to Distinctive Cation Concentration Dependent Thermal Conductivity of Amorphous Li_xS (x = 0–2) Batteries

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Thermal transport in amorphous lithium-sulfur (α-Li_xS) is systematically investigatedusing molecular dynamics and the contributions from different types ofheat carriers are quantitatively evaluated. In general, the thermal conductivity(TC) of α-Li_xS changes largely by varying the concentration (x) of Li ions in α-Li_xS.Interestingly, the TC of α-Li_xS shows three distinct regimes of dependence on Liconcentration. For low Li concentration (x = 0.4–1.2), the TC grows slowly, followedby a rapid increase in TC for medium Li concentration (x = 1.2–1.6),where the growth rate is three times that of the first regime, and finally, the TCis independent of Li concentration (x = 1.6–2.0). The TC enhancement in the firstand second regimes is mainly attributed to propagating and non-propagatingvibrational modes in α-Li_xS, respectively. In contrast, the stable thermal transportregime is governed by the competition between propagating and non-propagatingphonons. These investigations provide quantitative TC data of variouspolysulfides for shuttling analysis, and a fundamental understanding of thethermal transport mechanism of complex α-Li_xS structures, which is beneficialfor the rational design of thermal management of Li-S batteries.

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来源
《Advanced functional materials》 |2023年第34期|2214501.1-2214501.9|共9页
作者
Yufei Gao; Hongzhao Fan; Yanguang ZhouMing Hu;
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作者单位

Key Laboratory of Ocean Energy Utilization and Energy Conservation ofMinistry of EducationSchool of Energy and Power EngineeringDalian University of TechnologyDalian, Liaoning 116024, China;

Department of Mechanical and Aerospace EngineeringThe Hong Kong University of Science and TechnologyHong Kong, Hong Kong SAR 00852, Hong Kong, HKUST Shenzhen-Hong Kong Collaborative Innovation Research InstituteFutianShenzhen, Guangdong 518000, China;

Department of Mechanical EngineeringUniversity of South CarolinaColumbia, SC 29208, USA;

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正文语种英语
中图分类无线电电子学、电信技术;工程材料学;
关键词
lithium sulfide batteries; molecular dynamics simulations; propagating and non-propagating phonons; thermal conductivity; thermal management;

Competing Heat Carriers Leading to Distinctive Cation Concentration Dependent Thermal Conductivity of Amorphous Li_xS (x = 0–2) Batteries

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