Keeping a battery charged is one of the necessities of life these days, whether it's in a laptop, cell phone, or automobile. UCSB researchers have discovered a way to lengthen that charge at a molecular level in sodium-ion batteries, an increasingly intriguing power cell.
Lithium is the most commonly used ingredient in small but powerful batteries, but the availability of the element is limited. Scientists are looking at sodium as a more ubiquitous source but have been stymied by the sodium ion's shorter lifetime in battery form. In particular, sodium manganese dioxide (NaMn02) is being investigated for power storage, and members of UCSB professor Chris Van de Walle's Computational Materials Group examined the action of hydrogen, introduced unintentionally into the battery, on its longevity.
Van de Walle and his lab's post-docs Zhen Zhu and Hartwin Peelaers found that hydrogen not only entered the material easily but broke apart the manganese-oxide "backbone" that held the molecular structure together. Once broken, the material increasingly failed to hold a charge, Zhu told The Current, a UCSB publication.