UCLA researchers in the Department of Chemistry and Biochemistry have developed a method of synthesizing micrometer tin particles with nanosporous architecture and have successfully demonstrated the use of these particles as a high energy density anode for Na-ion and Li-ion batteries.
Among various state-of-the-art batteries, Li-ion battery currently predominates the market of energy storage devices. However, the total capacity of Li-ion batteries is limited by the theoretical capacities of their cathode materials, and can no longer satisfy the increasing demand in new energy storage applications, such as hybrid electric vehicle (HEV)/electrical vehicle (EV) and smart grid. The demand for higher energy, higher power density, and low overall production cost calls for R&D efforts on improvement of traditional Li-ion batteries.
Advanced batteries require anode materials capable of incorporating large amount of ions, which can be quantified by their gravimetric ion storage capacity. Tin has an excellent gravimetric ion storage capacity, but micrometer dense tin cannot be used as an anode material because of significant structural failure (i.e. crack, fracture) under repeated cycling due to volume changes. Therefore, there is a need for high energy density anode materials for Li-ion, Na-ion batteries.
Researchers at UCLA have developed a method synthesizing nanoporous tin (Sn) particles by free-corrosion dealloying. The Sn particle size and the porosity can be tuned to match specific application requirements, and composite electrode with nanoporous Sn particles endows long cycle life and fast kinetic performance.
Prototype has been successfully tested in a laboratory setting.
|United States Of America||Issued Patent||10,147,936||12/04/2018||2016-095|
Energy storage, battery, nanobattery, nanoporous tin, selective alloy corrosion, dealloying, demetalification