Thermal conductive aramid nanofiber/surface-decorated alumina microsphere composite separator

Chang，Chen1,2; Wang，Xuyang1; Zeng，Xingyan1; Wen，Yingfeng1; Nie，Hui1; Chang，Li3; Zhou，Xingping1; Xie，Xiaolin1; Ye，Lin4; Mai，Yiu Wing1,5

2024-03-15

10.1016/j.polymer.2024.126793

Polymer   影响因子和分区

0032-3861

The development of lithium-sulfur (Li–S) batteries is hindered by inhomogeneous Li plating and irreversible loss of active materials. In this work, a thermal conductive and electrocatalytic aramid nanofiber (ANF) composite separator containing surface-decorated alumina (AlO) microspheres is prepared through a simple filtration approach using ZnO nanosheets decorated AlO microspheres (AlO@ZnO) as the thermal conductive filler and electrocatalyst. Compared with the separators fabricated by surface modification of commercial polyolefin separators, the as-prepared ANF/AlO@ZnO composite separator features homogeneous compositions and ensures uniform thermal distribution in both the through-plane and in-plane directions of the membrane. By rationally designing the structure of AlO@ZnO and adjusting the mass ratio of AlO@ZnO to ANF, excellent thermal conduction networks are formed by overlapping the ZnO nanosheets. Hence, the prepared ANF/AlO@ZnO composite separator possesses higher thermal conductivity than ANF/AlO composite separator, which benefits uniform thermal distribution and homogeneous Li plating within the battery. Moreover, the electrocatalytic ZnO nanosheets catalyze the conversion of lithium polysulfides, efficiently inhibiting the shuttle effect and improving sulfur utilization. When subjected to a temperature gradient, the ANF/AlO@ZnO composite separator assembled cells display high initial capacity, low decay rate, and superb cycle stability. This novel composite separator integrates both thermal conductive and electrocatalytic functional components with the heat-resistant ANF matrix, offering a new design strategy of separator towards high-performance Li–S batteries.

Composite separator Electrocatalysis Thermal conductivity

SCI ; EI

英语

其他

CHEMISTRY

2-s2.0-85186268672

Scopus

1.Key Laboratory for Material Chemistry of Energy Conversion and Storage,Ministry of Education,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan,430074,China
2.Dongfeng Motor Corporation Research & Development Institute,Wuhan,430058,China
3.Centre for Advanced Materials Technology (CAMT),School of Aerospace,Mechanical and Mechatronic Engineering J07,The University of Sydney,Sydney,2006,Australia
4.School of System Design and Intelligent Manufacturing (SDIM),Southern University of Science and Technology,Shenzhen,518055,China
5.Department of Mechanical Engineering,The Hong Kong Polytechnic University,Kowloon,Hung Hom, Hong Kong,China

Chang，Chen,Wang，Xuyang,Zeng，Xingyan,et al. Thermal conductive aramid nanofiber/surface-decorated alumina microsphere composite separator[J]. Polymer,2024,296.

Chang，Chen.,Wang，Xuyang.,Zeng，Xingyan.,Wen，Yingfeng.,Nie，Hui.,...&Mai，Yiu Wing.(2024).Thermal conductive aramid nanofiber/surface-decorated alumina microsphere composite separator.Polymer,296.

Chang，Chen,et al."Thermal conductive aramid nanofiber/surface-decorated alumina microsphere composite separator".Polymer 296(2024).