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Author

Park, Jongnam
Materials and Chemistry Lab (MCL)
Research Interests
  • Inorganic synthesis, microfluidics, nanomaterials, surface engineering, bioimaging

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A new polymeric binder for silicon-carbon nanotube composites in lithium ion battery

Cited 2 times inthomson ciCited 1 times inthomson ci
Title
A new polymeric binder for silicon-carbon nanotube composites in lithium ion battery
Author
Bae, JoonwonCha, Sang-HoPark, Jongnam
Keywords
Carbon nanotubes (CNT); Initial Coulombic efficiency; Lithium-ion battery; Nanotube composites; Polyethyleneimine; Polyvinyldifluoride; Solid electrolyte interfaces; Zeta potential analysis
Issue Date
201307
Publisher
POLYMER SOC KOREA
Citation
MACROMOLECULAR RESEARCH, v.21, no.7, pp.826 - 831
Abstract
We introduced polyethyleneimine (PEI) as a new binder for silicon (Si)-carbon nanotube (CNT) anode materials in lithium ion batteries (LIBs). The PEI binder was chosen to enhance the binding of electrode material containing Si-CNT nanocomposites through the formation of a PEI thin layer on the surfaces of CNTs. It was expected that the spontaneous electrostatic interactions between weakly charged PEI molecules with CNT surfaces could promote the binding performance. In other words, the formation of solid-electrolyte interface (SEI) could be suppressed owing to the effect of dominant electrostatic interactions between PEIs and CNTs. Zeta potential analyses demonstrated the real presence of electrostatic interactions between PEIs and CNTs. Accordingly, lithium battery half-cell tests showed that improved capacity retention behavior was observed in the sample with PEI than that with polyvinyldifluoride (PVDF) binder. Remarkably, for the case of Si-CNT anode materials prepared without or with relatively less amount of CNT, a higher reduction in capacity was observed with PEI binder than with PVDF. An additional advantage of the incorporation of PEI binder is an increase of initial coulombic efficiency approximately 5%similar to 10%. Consequently, all these findings support that PEI is highly desirable as an alternative binder for electrode materials containing CNT.
URI
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DOI
http://dx.doi.org/10.1007/s13233-013-1089-3
ISSN
1598-5032
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