Journal
NANO ENERGY
Volume 31, Issue -, Pages 478-485Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.11.045
Keywords
Halloysite nanotube; Nano-clay; Solid polymer electrolyte; Flexible film; Lithium-sulfur battery
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Funding
- National Natural Science Foundation of China [51274239]
- program of China Scholarships Council
- Fundamental Research Funds from the Central Universities for Central South University [2015zzts036]
- Seed Grant Program from the University of Utah [VP_00001629]
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Solid polymer electrolytes (SPEs) show increasing potential for application in high energy lithium sulfur batteries due to good flexibility and high safety. However, low room temperature ionic conductivity of SPEs has become the main limitation. Herein, a novel SPE film using natural halloysite nano-clay has been fabricated, which exhibits exceptional ionic conductivity of 1.11x10(-4) S cm(-1) and lithium ion transference number of 0.40 at 25 degrees C. The mechanism of enhanced lithium ion transport is considered. The oppositely charged halloysite nanotube surfaces separate lithium salt into lithium ions that are absorbed on the negatively charged outer silica surface, and anions may be accommodated on the positively charged inner aluminol surface. So, an ordered 3D structure for free lithium ion transport is suggested. This potential application of the natural halloysite nano clay has been demonstrated by an all-solid-state lithium-sulfur battery over a wide temperature range of 25-100 degrees C. These results reveal the possibility of realizing sustainable high energy storage at a reduced cost.
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