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| Home > Publications database > Sol-gel surface coating of cathodematerials for lithium ion batteries |
| Poster (Other) | FZJ-2020-01092 |
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2019
Please use a persistent id in citations: http://hdl.handle.net/2128/24509
Abstract: Lithium ion batteries play an important role in the field of electromobility and stationary energy storage. Unfortunately, their improvable energy density, efficiency and lifetime still limit their comprehensive application. Major issues with respect to cathode degradation involve metal ion dissolution due to hydrofluoric acid etching, cation disorder or unwanted phase transitions. The sol-gel method is a useful and widely used strategy to apply functional cathode coatings which prevent the direct contact with the HF-containing electrolyte. These protective coatings not only prevent unwanted side reactions but also reduce heat generation during cycling resulting in an improved electrochemical performance. An initial evaluation of chemical and electrochemical influence of sol-gel coatings (e.g. ZrO2, ZnO) on planar model electrodes produced by radiofrequency magnetron sputtering (e.g. LiCoO2) is conducted. Besides electric and ionic conductivities, surface morphologies and chemical compositions of the respective coatings are investigated. Based on the findings regarding wetting behavior of the sol-gel film and the intrinsic mechanism between the different thin film layers, the coating process is further optimized: Surface pretreatment, sol precursor selection, dip- and spin coating process parameters as well as heat treatment parameters are equally taken into account. In consideration of economic aspects, the previously identified coatings are transferred to commercial cathode materials in powder form. For this purpose, a variety of different precursors, solvents and dispersion agents are evaluated and optimized aiming for a uniform coating with a layer thickness in the nanometer range.
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