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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Li2NiO2F a new oxyfluoride disordered rocksalt cathode material Xiaoyu Xu , John-Joseph Marie , Gregory J Rees , Liquan Pi , Chen Gong , Shengda Pu , Robert A. House , Alexander W. Robertson , Peter G. Bruce Journal Of The Electrochemical Society DOI: 10.1149/1945-7111/ac1be1 Open Access Show Abstract ▼ Abstract: Lithium-rich disordered rocksalts such as Li1.3Nb0.3Mn0.4O2 and Li2MnO2F are being investigated as high energy density cathodes for next generation Li-ion batteries. They can support the (de)intercalation of lithium ions over large compositional ranges while preserving the same overall structure. Here, we present a new Ni-rich oxyfluoride cathode, Li2NiO2F, with a disordered rocksalt structure. Li2NiO2F and can deliver a discharge capacity of 200 mAh g-1 at an average voltage of 3.2 V.	Aug 2021
I12-JEEP: Joint Engineering, Environmental and Processing	Visualizing plating-induced cracking in lithium-anode solid-electrolyte cells Ziyang Ning , Dominic Spencer Jolly , Guanchen Li , Robin De Meyere , Shengda D. Pu , Yang Chen , Jitti Kasemchainan , Johannes Ihli , Chen Gong , Boyang Liu , Dominic L. R. Melvin , Anne Bonnin , Oxana Magdysyuk , Paul Adamson , Gareth O. Hartley , Charles W. Monroe , James Marrow , Peter G. Bruce Nature Materials 1 DOI: 10.1038/s41563-021-00967-8 Diamond Proposal Number(s): [20795] Show Abstract ▼ Abstract: Lithium dendrite (filament) propagation through ceramic electrolytes, leading to short circuits at high rates of charge, is one of the greatest barriers to realizing high-energy-density all-solid-state lithium-anode batteries. Utilizing in situ X-ray computed tomography coupled with spatially mapped X-ray diffraction, the propagation of cracks and the propagation of lithium dendrites through the solid electrolyte have been tracked in a Li/Li6PS5Cl/Li cell as a function of the charge passed. On plating, cracking initiates with spallation, conical ‘pothole’-like cracks that form in the ceramic electrolyte near the surface with the plated electrode. The spallations form predominantly at the lithium electrode edges where local fields are high. Transverse cracks then propagate from the spallations across the electrolyte from the plated to the stripped electrode. Lithium ingress drives the propagation of the spallation and transverse cracks by widening the crack from the rear; that is, the crack front propagates ahead of the Li. As a result, cracks traverse the entire electrolyte before the Li arrives at the other electrode, and therefore before a short circuit occurs.	Apr 2021

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