@phdthesis{Shim2020,
  author    = {Hwirim Shim},
  title     = {Nano-design of metal oxide electrodes for Li- and Na-ion hybrid energy storage},
  address   = {Saarbr{\"u}cken},
  doi       = {10.22028/D291-32871},
  url       = {https://nbn-resolving.org/urn:nbn:de:bsz:291:415-2150},
  pages     = {V, 150 S.},
  year      = {2020},
  abstract  = {The growing use of portable devices and a global transition to electric vehicles has tremendously increased the demand for energy storage devices such as lithium-ion batteries and supercapacitors. Especially the interest is established for better devices exceeding the energy and power performance of current technology. The hybrid supercapacitor (HSC) concept addresses the limits of each device and utilizes the distinct electrochemical features of lithium-ion batteries and supercapacitors. The focus of this Ph.D. thesis is the nano-design of hybrid materials of metal oxides and carbon for better electrochemical performance in lithium- and sodium-ion hybrid energy storage devices. The hybridization of metal oxide and carbon substrate can be achieved by tailored sol-gel synthesis, yielding a homogeneous distribution of nanosized metal oxide domain in the hybrid material. The performance of the hybrids was superior to the composite concept electrodes, but this is not a statement that can be generalized for all sorts of (nano)composites. In addition to the electrode material, also the electrolyte choice has a strong impact on the device operation and safety. The use of alternative solvents and Li- or Na-containing ionic liquids allows to increase the upper temperature and cell voltage at which Li- and Na-based systems can be safely operated at.},
  language  = {en}
}