Effect of pristine nanostructure on first cycle electrochemical characteristics of lithium-rich lithium–nickel–cobalt–manganese-oxide cathode ceramics for lithium ion batteries
| Autor: | Helmut Ehrenberg, Yongyao Xia, Florian Sigel, Ingo Kerkamm, Lars Riekehr, Björn Schwarz, Jinlong Liu |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Nanostructure Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences law.invention law Nano Ceramic Electrical and Electronic Engineering Physical and Theoretical Chemistry Renewable Energy Sustainability and the Environment 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Nickel chemistry visual_art visual_art.visual_art_medium Lithium 0210 nano-technology Cobalt |
| Zdroj: | Journal of Power Sources. 306:135-147 |
| ISSN: | 0378-7753 |
| Popis: | Structural and electrochemical (EC) data of five different xLi 2 MnO 3 :(1-x)Li(Ni 1/3 Co 1/3 Mn 1/3 )O 2 cathode ceramics are presented. The aim of this work is to highlight the nano structure of this material class, next to the choice of right composition, as the key to anomalously high discharge capacities > 250 mAhg −1 . Therefore, the pristine nano composite structure of five different samples has been analyzed extensively by transition electron microscopy with respect to Li 2 MnO 3 domain size, shape and dispersion. DIFFaX simulations and Rietveld refinements to synchrotron X-Ray diffraction patterns are used to confirm the TEM results with a statistically reliable bulk method. The EC characteristics of the first cycle have been evaluated with respect to an EC active Li 2 MnO 3 component. By comparing the EC features of materials with x = 0.3, x = 0.5 and x = 0.7, it is evident that a composition of x = 0.5 is the most promising. To point out the impact of the pristine nano structure on the EC performance, three samples with x = 0.5 but considerable different nano domain arrangement, are compared. A strong influence has been found, with the highest discharge capacities for nano composites with small and evenly dispersed Li 2 MnO 3 domains. |
| Databáze: | OpenAIRE |
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