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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Effects of sulfate modification of stoichiometric and lithium-rich LiNiO2 cathode materials Bo Dong , Andrey Poletayev , Jonathon Cottom , Javier Castells-Gil , Ben Spencer , Cheng Li , Pengcheng Zhu , Yongxiu Chen , Jaime-Marie Price , Laura L. Driscoll , Phoebe K. Allan , Emma Kendrick , Saiful Islam , Peter R. Slater Journal Of Materials Chemistry A DOI: 10.1039/D4TA00284A Diamond Proposal Number(s): [14239] Open Access Show Abstract ▼ Abstract: Lithium nickel oxide, LiNiO2, has attracted considerable interest as a high energy cathode for next generation lithium ion batteries. Nevertheless, shortcomings such as significant cycling capacity decay and low stability in ambient atmosphere have hindered its practical application, and consequently most work has focused on the more stable Mn and Co doped analogues Li(Ni,Mn,Co)O2. Here, we report an investigation of an alternative strategy, sulfate modification, in the LiNiO2 (LNO) system. We show that improved performance can be achieved, attributed to the dual effect of a low level of bulk doping and the presence of a self-passivation Li2SO4 layer formed beyond the solid solution limit. Ab initio simulations suggest that the behavior is similar to that of other high valent dopants such as W and Mo. These dual effects contribute to the improved air stability and enhanced electrochemical performance for the sulfate modified lithium-rich LNO, leading to high initial capacities (~245 mAhg-1 at 25 mA/g, and ~205 mAhg-1 at 100 mA/g) and better capacity retention. Overall, the results show that polyanion modification represents an excellent alternative low cost strategy to improve the performance of lithium nickel oxide cathode materials.	Apr 2024
I19-Small Molecule Single Crystal Diffraction	Synthesis, structure and electrochemical properties of a new cation ordered layered Li-Ni-Mg-Mo oxide Bo Dong , Javier Castells-Gil , Pengcheng Zhu , Laura L. Driscoll , Emma Kendrick , Phoebe K. Allan , Peter R. Slater Materials Advances DOI: 10.1039/D2MA00981A Open Access Show Abstract ▼ Abstract: Lithium-rich oxides are attracting intense interest as the next generation cathode materials for lithium-ion batteries due to their high theoretical capacity. Nevertheless, these materials suffer from a number of shortcomings, such as oxygen loss at high voltage, large hysteresis and poor rate capability. In this work, we show that through a dual cation doping strategy replacing Ti with Mo and Mg, the disordered rocksalt (DRS) Li1.2Ni0.4Ti0.4O2 is transformed into a new cation ordered layered phase Li1.2Ni0.4Mo0.2Mg0.2O2, with the high valence dopant Mo6+ on the (0,0,0) site. Li1.2Ni0.4Mo0.2Mg0.2O2 showed improved performance compared to that of the similarly prepared DRS Li1.2Ni0.4Ti0.4O2 material (~190 mAhg-1 vs ~105 mAhg-1 after 10 cycles, respectively). The characteristics of the electrochemical process were studied using ex situ XRD and XAS, which indicated the involvement of both Ni and Mo redox during the cycling as well as the electrochemical instability of the layered phase which changes to a disordered rocksalt phase on cycling.	Jan 2023

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