Electrochemical Getters: A Novel Approach toward Improved Thermal Insulation

Abstract

An electrochemical getters (EG) is herein described consisting of a Li foil, or a lithiated metal oxide, a poly(ethylene) oxide (PEO) film containing a Li salt as the electrolyte, and a porous Ni electrode arranged in a layered-type structure. Application of a suitable negative potential or current to this cell causes metallic Li to electrodeposit on the Ni electrode, which then reacts with molecular atmospheric gases present in the surrounding environment. Integration of EG into vacuum insulated panels (VIP) or vacuum insulated glass (VIG) will allow the pressure within these enclosures to be maintained within optimum values, i.e. 10−3 to 10−4 torr, and for the original composition of inert gas-filled windows (IGW) to remain unchanged for long periods of time. Such capabilities will offset possible degradation in the thermal insulating performance of these high performance building components induced by leaks through casings and/or seals. In addition, EG can serve as air leak detectors which can equipped with suitable wireless communication electronics to alert tenants to seek corrective action. All components of EG are chemically inert and air stable, and, hence, safe to transport and store, and becoming activated, via Li deposition, only once installed within the sealed enclosure. As envisioned, this technology could contribute over 1 quad of annual energy savings for the US and disrupt markedly the building industry.