The impact of oxygen evolution and cation migration on the cycling stability of a Li-rich Li[Li0.2Mn0.6Ni0.1Co0.1]O2 positive electrode
文献信息
Katarzyna Redel, Andrzej Kulka, Katarzyna Walczak, Camelia N. Borca, Janina Molenda
New generation cathode materials from the Li-rich NMC group are under constant investigation due to their extremely high energy densities. However, the exact mechanism of lithium (de)insertion in those materials, especially the reactions involving the redox of lattice oxygen, is still elusive. In this paper the structural and electrochemical properties of a high performance cathode material (Li[Li0.2Mn0.6Ni0.1Co0.1]O2) are investigated with special attention focused on the TM and oxygen ion contributions in electrochemical processes. The detailed description of the structural, electronic and electrochemical properties of nano-Li[Li0.2Mn0.6Ni0.1Co0.1]O2 during lithium (de)insertion are determined by means of electrochemical investigation as well as ex situ XAFS and operando XRD measurements. The obtained results show the correlation of the changes in the electronic structure of the materials with specific structural rearrangements and C2/m → Rm ↔ Fdm phase transitions. This paper shows the detailed analysis of the origins of the high capacity and low capacity fade of Li-rich layered oxides conditioned by the reversibility of the Li ion removal thanks to oxygen redox reactions as well as the migration of transition metal ions in the Li sublattice.
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Journal of Materials Chemistry A

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment










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