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Kinetics and Structural Investigation of Layered Li 9 V 3 (P 2 O 7 ) 3 (PO 4 ) 2 as a Cathode Material for Li‐Ion Batteries
Author(s) -
Balasubramanian Prasanth,
Mancini Marilena,
Geßwein Holger,
Geiger Dorin,
Axmann Peter,
Kaiser Ute,
WohlfahrtMehrens Margret
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700734
Subject(s) - cathode , electrochemistry , materials science , battery (electricity) , electrode , ion , crystallite , analytical chemistry (journal) , voltage , phase (matter) , kinetics , extraction (chemistry) , chemistry , electrical engineering , thermodynamics , physics , power (physics) , organic chemistry , chromatography , quantum mechanics , metallurgy , engineering
Cathode materials with improved safety and energy densities are required for developing next‐generation Li‐ion battery technology. Among different phosphate‐based materials, layered Li 9 V 3 (P 2 O 7 ) 3 (PO 4 ) 2 (LVPP) has recently been explored as a high‐voltage cathode. We report the feasibility of multi‐electron reactions and the influence of crystallite size on the electrode kinetics. The mechanism of Li extraction/insertion during charge and discharge is investigated and the structural transformations at high voltages are studied by means of in situ and ex situ analysis. The changes induced by electrochemical Li extraction are found to be reversible during cycling in the potential window of 2–4.6 V, whilst voltage profile changes and capacity fading is observed by charging up to 4.8 V, owing to irreversible phase transition and reduction of the interlayer distance. The findings can be applied for optimizing material synthesis as well as the working conditions in Li‐ion battery applications.