1. High-Performance Amorphous Carbon Coated LiNi0.6Mn0.2Co0.2O2 Cathode Material with Improved Capacity Retention for Lithium-Ion Batteries
- Author
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Marcus Jahn, Jürgen Kahr, Yuri Surace, Daniel Lager, Annick Hubin, Arlavinda Rezqita, Joeri Van Mierlo, Raad Hamid, Maitane Berecibar, Anish Raj Kathribail, Electrical Engineering and Power Electronics, Electromobility research centre, Faculty of Engineering, Earth System Sciences, Materials and Chemistry, and Electrochemical and Surface Engineering
- Subjects
TK1001-1841 ,Materials science ,Energy Engineering and Power Technology ,chemistry.chemical_element ,organic based coating ,engineering.material ,law.invention ,Furfuryl alcohol ,chemistry.chemical_compound ,Production of electric energy or power. Powerplants. Central stations ,Coating ,X-ray photoelectron spectroscopy ,law ,Electrochemistry ,Calcination ,Electrical and Electronic Engineering ,Conductive polymer ,polymer coating ,Cathode ,TP250-261 ,chemistry ,Amorphous carbon ,Chemical engineering ,carbon coating ,Industrial electrochemistry ,engineering ,Lithium ,capacity retention ,high-performance cathode ,Ni-rich layered cathode - Abstract
Coating conducting polymers onto active cathode materials has been proven to mitigate issues at high current densities stemming from the limited conducting abilities of the metal-oxides. In the present study, a carbon coating was applied onto nickel-rich NMC622 via polymerisation of furfuryl alcohol, followed by calcination, for the first time. The formation of a uniform amorphous carbon layer was observed with scanning- and transmission-electron microscopy (SEM and TEM) and X-ray photoelectron spectroscopy (XPS). The stability of the coated active material was confirmed and the electrochemical behaviour as well as the cycling stability was evaluated. The impact of the heat treatment on the electrochemical performance was studied systematically and was shown to improve cycling and high current performance alike. In-depth investigations of polymer coated samples show that the improved performance can be correlated with the calcination temperatures. In particular, a heat treatment at 400 °C leads to enhanced reversibility and capacity retention even after 400 cycles. At 10C, the discharge capacity for carbon coated NMC increases by nearly 50% compared to uncoated samples. This study clearly shows for the first time the synergetic effects of a furfuryl polymer coating and subsequent calcination leading to improved electrochemical performance of nickel-rich NMC622.
- Published
- 2021