In-situ / operando structural study of Li1+x(Mn1-y-zNiyMz)1-xO2 as promising positive electrode materials for Lithium-ion batteries
We have recently developed four compositions of general formula Li1+x(Mn1-y-zNiyMz)1-xO2 for Li and Mn-rich layered oxides (M can be Al, Co ), all of them showing electrochemical activity at high voltage (up to 4.8 V vs Li+/Li). Futhermore, four new compositions such as Li(NiIIx;yMnIVx+3yCoIII1-2(x+2y))O2, with (x+2y) around 0.425 are under study in our group, for which creating cationic deficiencies within the slabs allows developing Li and Mn-rich layered oxides with minimized first cycle irreversible capacity. The first goal here is to determine changes in the anionic and cationic environments of each cation (Li, Ni, Mn and M) in the four compositions Li1+x(Mn1 y-zNiyMz)1-xO2 upon cycling. Concerning the cationic deficient layered oxides Li(NiIIx;yMnIVx+3yCoIII1-2(x+2y))O2, the structure of the pristine materials has first to be determined before the study of its changes upon cycling: the goal is to obtain high resolution neutron powder diffraction patterns in order to determine the cationic distribution within these layered structures and to compare it with our other characterizations, and especially with the powder density measurements.
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RENZI Tatiana; CROGUENNEC Laurence; Thomas C. Hansen; MASQUELIER Christian; SUARD Emmanuelle and TERTOV Ilia. (2017). In-situ / operando structural study of Li1+x(Mn1-y-zNiyMz)1-xO2 as promising positive electrode materials for Lithium-ion batteries. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-25-256
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