Binder Free and Multicomponent Layer-by-Layer Separator Coating for Lithium Batteries
- 詳細技術說明
- The invention is a method to rapidly coatdiverse forms and selections of nanomaterials on a conventional separator in alayer-by-layer fashion, without utilizing chemical binders, for lithium-sulfur andlithium-metal batteries.
- *Abstract
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The method created by Prof. LyndenArcher’s group at Cornell University resolves two key problems of currentlithium-sulfur and lithium-metal battery separators. First, it prevents the lithium polysulfideshuttling caused by dissolution during the discharge of lithium-sulfurcells. Second, the separator coating preventsthe dendritic growth of lithium metal in the lithium-metal cells, whichdiminish the battery’s electrochemical performance, cause poor cycling lifetimeand low coulombic efficiency, and raise serious safety concerns from thepossibility of short circuits igniting the flammable electrolyte.
The conventionalseparator is coated with a monolayer of various nanomaterials, includingnanospheres, nanopowders, nanofibers or polymer powders. This is performed usinga new binder-free coating method, termed Langmuir–Blodgett–Scooping (LBS),which can rapidly create multifunctional coatings. The new coating process is faster thanconventional methods including Langmuir Blodgett deposition, doctor-bladecoating, tape casting, and vacuum filtration methods. As such this method ispromising for large-scale applications. Further, coating separators with conductivecarbon and metal oxide in a layer-by-layer fashion yields superbelectrochemical performance of the lithium-sulfur and lithium-metalbatteries.
Potential Applications
- Separator forlithium-sulfur and lithium-metal batteries
Advantages
- Prevents lithium polysulfidefrom being absorbed by the separator
- Prevents shortcircuits caused by dendrite growth in lithium-metal batteries, which may ignitethe electrolyte
- Large-scale coatingtechnique
- Technique suitablefor a wide variety of organic or inorganic nanoparticles including:
Silica nanospheres, MWCNTs, CarbonBlack, Hard Carbon, Graphite, polystyrene spehere, titania, etc.
- *Licensing
- Carolyn A. Theodorecat42@cornell.edu607 254 4514
- 其他
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- Kim, M.K., et al. (2016) “MultifunctionalSeparator Coatings for High-Performance Lithium–Sulfur Batteries.” Adv. Mater. Interfaces, 1600450.doi:10.1002/admi.201600450
- Kim Mun Sek, Choudhury Snehashis, Ma Lin, LyndenArcher. “Organized Nanoparticulate and Microparticulate Coatings and Method ofMaking and Using Same” Publication Number:WO2017100758A1;Publication Date: 15 Jun 2017
- 國家/地區
- 美國
