氧化还原
尖晶石
X射线吸收光谱法
过渡金属
电化学
阴极
吸收光谱法
吸收(声学)
光谱学
金属
材料科学
扩展X射线吸收精细结构
化学
化学物理
无机化学
物理化学
电极
催化作用
生物化学
物理
量子力学
冶金
复合材料
作者
Marcus Fehse,Naiara Etxebarria,Laida Otaegui,Marta Cabello,Silvia Martín-Fuentes,Maria Angeles Cabañero,Icíar Monterrubio,Christian Fink Elkjær,Óscar Fabelo,Nahom Asres Enkubari,Juan Miguel López del Amo,Montse Casas‐Cabañas,Marine Reynaud
标识
DOI:10.1021/acs.chemmater.2c01360
摘要
An operando dual-edge X-ray absorption spectroscopy on both transition-metal ordered and disordered LiNi0.5Mn1.5O4 during electrochemical delithiation and lithiation was carried out. The large data set was analyzed via a chemometric approach to gain reliable insights into the redox activity and the local structural changes of Ni and Mn throughout the electrochemical charge and discharge reaction. Our findings confirm that redox activity relies predominantly on the Ni2+/4+ redox couple involving a transient Ni3+ phase. Interestingly, a reversible minority contribution of Mn3+/4+ is also evinced in both LNMO materials. While the reaction steps and involved reactants of both ordered and disordered LNMO materials generally coincide, we highlight differences in terms of reaction dynamics as well as in local structural evolution induced by the TM ordering.
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