Siloxane-crosslinked Layer-by-Layer Films

Technology #16521

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Inventors
Professor Paula Hammond
Department of Chemical Engineering
External Link (hammondlab.mit.edu)
Sun Lee
Department of Chemical Engineering
Mariya Khiterer
Department of Chemical Engineering
Managed By
Christopher Noble
MIT Technology Licensing Officer - Clean and Renewable Energy
Patent Protection

Lithium Ion Conducting Protective Film and Method of Use

US Patent Pending 2014-0377670

Applications

Composite films function as lithium ion conducting protective films that isolate the lithium anode from the positive electrochemistry of the cathode. A siloxane-crosslinked layer-by-layer film can be used as a protective barrier for the lithium metal anode in a non-aqueous Lithium-Air battery.

Problem Addressed

Current lithium-air anodes are subject to lithium dendrite growth, reduced oxygen, and moisture exposure, each reducing the efficiency of the battery. This technology creates a film that isolates the lithium anode from the positive electrochemistry of the cathode and prevents lithium dendrite growth, reduced oxygen, and moisture exposure. 

Technology

Layer-by-layer deposition involves alternating adsorption of soluble or dispersible components that exhibit complementary interactions to the substrate and to each other. In this manner, films can be deposited by dip, spin, and spray coating from solutions of polycations, polyiions, positively and negatively charged particles or micelles, and components that interact via hydrogen or covalent bonding. This film consists of poly (ethylene oxide) (PEO), graphene oxide (GO), poly (acrylic acid) (PAA), and mono or bifunctional poly (ethylene oxide) trialkoxysilane.

Advantages

  • Prevents lithium dendrite growth, reduced oxygen, and moisture exposure
  • Improves battery performance