ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The currently commercialized cathode material for Li ion batteries such as LiCoO2exhibited limit to further improve the performance of the batteries, since the employed screen printingmethod for cathode fabrication is difficult to reduce the thickness and control the microstructure ofthe oxide layer. In this studies, we have synthesized Li(Ni1-xCox)O2 thin film by utilizing Li-diffusionreaction on the surface of Ni-Co alloy substrates. For the preparation of Ni-Co alloy rod, Ni and20at.%Co powder were mixed for 24hrs by ball milling, and then pressed into rod-shape bycold-isostatic pressing. The Ni-Co rods were sintered at 1100°C for 6hrs in the reducing atmosphereof Ar 96% and H2 4%. The sintered Ni-20at%Co rod was cold-rolled into tape at 5% reduction ratiowith the final thickness of 100㎛, and the recrystallization heat treatment for the development of thecube texture of the rolled Ni alloy tape was carried out at 1000°C in Ar 96% and H2 4%. After thinlayer of metallic Li was deposited on the surface of Ni-Co template using thermal evaporation methodin the glove box, the Li/Ni-Co composite tape were heat-treated at 700~850°C for 1~2hrs in oxidizingatmosphere to induce Li-diffusion into Ni-Co substrate and Li(Ni0.8Co0.2)O2 phase formation. Thephase evolution of Li(Ni0.8Co0.2)O2 was confirmed by X-ray diffraction and the grain size andmorphology of the surface were analyzed by scanning electron microscopy and atomic forcemicroscopy. Also the charge and discharge test were conducted to confirm the electricalcharacteristics of Li(Ni1-xCox)O2/Ni-Co thin film for the cathode application
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.403.pdf
Permalink