Nanoparticle-coated Separators for Lithium-ion Batteries with Advanced Electrochemical Performance
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Abstract
We report a simple, scalable approach to improve the interfacial
characteristics and, thereby, the performance of commonly used
polyolefin based battery separators. The nanoparticle-coated
separators are synthesized by first plasma treating the membrane
in oxygen to create surface anchoring groups followed by immersion
into a dispersion of positively charged SiO2 nanoparticles.
The process leads to nanoparticles electrostatically adsorbed not
only onto the exterior of the surface but also inside the pores of
the membrane. The thickness and depth of the coatings can be
fine-tuned by controlling the f-potential of the nanoparticles.
The membranes show improved wetting to common battery
electrolytes such as propylenecarbonate. Cells based on the
nanoparticle-coated membranes are operable even in a simple
mixture of EC/PC. In contrast, an identical cell based on the
pristine, untreated membrane fails to be charged even after
addition of a surfactant to improve electrolyte wetting. When
evaluated in a Li-ion cell using an EC/PC/DEC/VC electrolyte
mixture, the nanoparticle-coated separator retains 92% of its
charge capacity after 100 cycles compared to 80 and 77% for the
plasma only treated and pristine membrane, respectively.
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This material is based on work supported as part of the Energy
Materials Center at Cornell, an Energy Frontier Research
Center funded by the U.S. Department of Energy, Office of
Science, Office of Basic Energy Sciences under Award Number
DE-SC0001086. This publication is based on work supported
in part by Award No. KUS-C1-018-02,made by King Abdullah
University of Science and Technology (KAUST). The authors
acknowledge financial support from the Ministry of Economic
Affairs of the Republic of China and the assistance from the
Materials and Chemical Research Laboratories of the Industrial
Technology Research Institute. The authors thank Mr Fred Humiston, Celgard LCC for kindly supplying the separator.
Date Issued
2011-07-06
Publisher
Royal Society of Chemistry
Keywords
nanoparticle-coated separators; electrochemical performance
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Previously Published As
Physical Chemistry Chemical Physics, July 2011, 13, 14457-14461
Government Document
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