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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis I21-Resonant Inelastic X-ray Scattering (RIXS)	Oxygen-redox activity in non-lithium-excess tungsten-doped LiNiO2 cathode A. S. Menon , B. J. Johnston , S. G. Booth , L. Zhang , K. Kress , B. E. Murdock , G. Paez Fajardo , N. N. Anthonisamy , N. Tapia-Ruiz , S. Agrestini , M. Garcia-Fernandez , K. Zhou , P. K. Thakur , T. L. Lee , A. J. Nedoma , S. A. Cussen , L. F. J. Piper Prx Energy 2 DOI: 10.1103/PRXEnergy.2.013005 Diamond Proposal Number(s): [29104, 29113] Open Access Show Abstract ▼ Abstract: The desire to increase the energy density of stoichiometric layered Li TM O 2 (TM = 3d transition metal) cathode materials has promoted investigation into their properties at high states of charge. Although there is increasing evidence for pronounced oxygen participation in the charge compensation mechanism, questions remain whether this is true O -redox, as observed in Li -excess cathodes. Through a high-resolution O K-edge resonant inelastic x-ray spectroscopy (RIXS) study of the Mn -free Ni -rich layered oxide Li Ni 0.98 W 0.02 O 2 , we demonstrate that the same oxidized oxygen environment exists in both Li -excess and non- Li -excess systems. The observation of identical RIXS loss features in both classes of compounds is remarkable given the differences in their crystallographic structure and delithiation pathways. This lack of a specific structural motif reveals the importance of electron correlation in the charge compensation mechanism for these systems and indicates how a better description of charge compensation in layered oxides is required to understand anionic redox for energy storage.	Mar 2023
I07-Surface & interface diffraction	A general mechanism for controlling thin film structures in all-conjugated block copolymer:fullerene blends Rajeev Dattani , James H. Bannock , Zhuping Fei , Roderick Mackenzie , Anne Guilbert , Michelle Vezie , Jenny Nelson , John C. De Mello , Martin Heeney , Joao Cabral , Alisyn Nedoma Journal Of Materials Chemistry A DOI: 10.1039/C4TA03146F Diamond Proposal Number(s): [8339] Show Abstract ▼ Abstract: Block copolymers have the potential to self-assemble into thermodynamically stable nanostructures that are desirable for plastic electronic materials with prolonged lifetimes. Fulfillment of this potential requires the simultaneous optimisation of the spatial organisation and phase behaviour of heterogeneous thin films at the nanoscale. We demonstrate the controlled assembly of an all-conjugated diblock copolymer blended with fullerene. The crystallinity, nanophase separated morphology, and microscopic features are characterised for blends of poly(3-hexylthiophene-block-3-(2-ethylhexyl) thiophene) (P3HT-b-P3EHT) and phenyl-C61-butyric acid methyl ester (PCBM), with PCBM fractions varying from 065 wt%. We find that PCBM induces the P3HT block to crystallise, causing nanophase separation of the block copolymer. Resulting nanostructures range from ordered (lamellae) to disordered, depending on the amount of PCBM. We identify the key design parameters and propose a general mechanism for controlling thin film structure and crystallinity during the processing of semicrystalline block copolymers.	Jul 2014

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