Search Results

You searched for all publications:

with publication states 'Published (Approved)'

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

Exact matches
Related results

2 items found (0 items not approved), displaying all items.1

Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Electrochemical utilization of iron IV in the Li1.3Fe0.4Nb0.3O2 disordered rocksalt cathode Zachary W. Lebens-Higgins , Hyeseung Chung , Israel Temprano , Mateusz Zuba , Jinpeng Wu , Jatinkumar Rana , Carlos Mejia , Michael A. Jones , Le Wang , Clare P. Grey , Yingge Du , Wanli Yang , Ying Shirley Meng , Louis F. J. Piper Batteries & Supercaps 144 DOI: 10.1002/batt.202000318 Diamond Proposal Number(s): [22250, 22148] Show Abstract ▼ Abstract: Interest in alkali‐rich oxide cathodes has grown in an effort to identify systems that provide high energy densities through reversible oxygen redox. However, some of the most promising compositions such as those based solely on earth abundant elements, e. g., iron and manganese, suffer from poor capacity retention and large hysteresis. Here, we use the disordered rocksalt cathode, Li1.3Fe0.4Nb0.3O2, as a model system to identify the underlying origin for the poor performance of Li‐rich iron‐based cathodes. Using elementally specific spectroscopic probes, we find the first charge is primarily accounted for by iron oxidation to 4+ below 4.25 V and O2 gas release beyond 4.25 V with no evidence of bulk oxygen redox. Although the Li1.3Fe0.4Nb0.3O2 is not a viable oxygen redox cathode, the iron 3+/4+ redox couple can be used reversibly during cycling.	Jan 2021
I09-Surface and Interface Structural Analysis	How bulk sensitive is hard X-ray photoelectron spectroscopy: accounting for the cathode-electrolyte interface when addressing oxygen redox Zachary W. Lebens-Higgins , Hyeseung Chung , Mateusz J. Zuba , Jatinkumar Rana , Yixuan Li , Nicholas V. Faenza , Nathalie Pereira , Bryan D. Mccloskey , Fanny Rodolakis , Wanli Yang , M. Stanley Whittingham , Glenn G. Amatucci , Ying Shirley Meng , Tien-Lin Lee , Louis F. J. Piper The Journal Of Physical Chemistry Letters DOI: 10.1021/acs.jpclett.0c00229 Diamond Proposal Number(s): [22250, 22148] Show Abstract ▼ Abstract: Sensitivity to the `bulk' oxygen core orbital makes hard X-ray photoelectron spectroscopy (HAXPES) an appealing technique for studying oxygen redox candidates. Various studies have reported an additional O 1s peak (530-531 eV) at high voltages, which has been considered a direct signature of the bulk oxygen redox process. Here, we find the emergence of a 530.4 eV O 1s HAXPES peak for three model cathodes, Li2MnO3, Li-rich NMC, and NMC 442, that shows no clear link to expected oxygen redox. Instead, the 530.4 eV peak for these three systems is attributed to transition metal reduction and electrolyte decomposition in the near-surface region. Claims of oxygen redox relying on photoelectron spectroscopy must explicitly account for the surface sensitivity of this technique and the extent of the cathode degradation layer.	Feb 2020

Publications Database

Search Results

You searched for all publications:

Search Again...

Subject Areas (check all that apply) select all

Instruments used to collect data (check all that apply) select all

Collaborations involved (check all that apply) select all

Diamond Offline Facilities used

Relevant Technical Areas (check all that apply) select all

Menu for Anonymous User