Boron doped Li-ion battery production and investigation of electrical performance

In this thesis, we investigated the physical properties of the layered structure of LiCoO2 cathode material that's doped with Boron (B) instead of Cobalt (Co) states which is the one of the components of the Li-ion battery. During the study, LiCo0.875B0.125O2, LiCo0.750B0.250O2, LiCo0.625B0.375O2, LiCo0.500B0.500O2, LiCo0.250B0.750O2 and LiBO2 cathode materials was producted by doping with B in to LiCoO2 cathode material with the use of solid state reaction methode at 750 0C in Oxygen atmosphere. Microstructural, magnetic and electrical resistivity properties of the produced cathode materials are investigated and then these materials are used to produce CR2032 button batteries and we analyzed the cyclic voltammetry and capacity of these batteries. Of the manufactured cathode material, LiCo0.875B0.125O2, LiCo0.750B0.250O2 materials were found to be identical to the crystal structure of LiCoO2, however, higher Boron doped cathode materilas were distruped because of the inpurity phases. Although, batteries produced with the LiCo0.875B0.125O2 and LiCo0.750B0.250O2 cathode materials have lower capacity than the non-doped LiCoO2 cathode materials, they preserved their capacity in high cycle number. We found that LiCo0.875B0.125O2 and LiCo0.750B0.250O2 cathode materials have higher capacity than the un-doped LiCoO2 cathode materials in the long term use.