Thermal conductivity of VO nanowires and their contact thermal conductance

• Published in: Nanoscale 2020-01, Vol.12 (2), p.1138-1143
• Main Authors: Wang, Qilang, Liang, Xing, Liu, Bohai, Song, Yihui, Gao, Guohua, Xu, Xiangfan
• Format: Article
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/c9nr08803b

Vanadium pentoxide (V 2 O 5 )-based composites show outstanding performances as cathode materials in lithium-ion batteries. However, their inferior thermal conductivity restricts the heat dissipation through the cathode electrode. In this study, we measured the thermal conductivity of V 2 O 5 nanowires using the thermal bridge method and found that their thermal conductivity is 3.84 ± 0.38 W m −1 K −1 at T = 300 K. The contact thermal resistance between two nanowires with the same size was measured to be up to 50%-80% of the total thermal resistance in the measured samples, indicating that their contact is the bottleneck for thermal dissipation. Thermal measurements of V 2 O 5 nanowires suggest the vital role of interfacial thermal resistance in the heat dissipation in Li-ion batteries.