Elizabeth Ranney

-Research Interests-

The increasing use of laptops, cell phones, PDA’s, digital cameras, and other portable electronic devices, as well as electric and hybrid vehicles, has created a demand for low-cost, rechargeable batteries. Lithium ion batteries are preferable for these applications due to their higher energy densities. However, lithium ion batteries can suffer from low discharge rates, which can cause problems in applications where high power is required. For example, some electronic devices require short bursts of energy; likewise, hybrid vehicles need enough energy to accelerate quickly. When discharged too quickly these batteries can heat up and even explode. As a result, there is a clear need for improved lithium ion battery technology.

A solution to the shortcomings of lithium ion batteries could be the replacement of the anode with titania nanotubes. Nanotubes are desirable due to their high surface area to volume ratio, which allows for increased capacity because more lithium ions can be stored in a smaller volume. Nanotubes would also provide pathways for ion travel, allowing the discharge rate to be controlled. In particular, titania nantobues would allow for rapid discharge rates because lithium ions can be easily stored and released from its lattice structure. The goals of this project are to study the properties of titania nanotubes and to implement them into a working lithium ion battery. If successful, not only will portable electronic devices become more marketable, but hybrid and electric cars will become more viable.