Nanoparticle-coated Separators for Lithium-ion Batteries with Advanced Electrochemical Performance
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.
Main Authors: | , , , , , , , , |
---|---|
Format: | article biblioteca |
Language: | en_US |
Published: |
Royal Society of Chemistry
2011-07-06
|
Subjects: | nanoparticle-coated separators, electrochemical performance, |
Online Access: | https://hdl.handle.net/1813/33693 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | 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. |
---|