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Instantaneous Surface Li$_{3}$PO$_{4}$ Coating and Al–Ti Doping and Their Effect on the Performance of LiNi$_{0.5}$Mn$_{1.5}$O$_{4}$ Cathode Materials

Mereacre, Valeriu 1; Bohn, Nicole 1; Stüble, Pirmin 1; Pfaffmann, Lukas 1; Binder, Joachim R. 1
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)

Using hydrogen peroxide (H2O2), a novel approach was applied for the synthesis of LiNi0.5Mn1.5O4 (LNMO) coated with Li3PO4 and doped with Al3+ and Ti4+ ions. The reaction between LNMO and H2O2 resulted in particles with a partially damaged surface. If the same reaction is done in the presence of lithium, aluminum, titanium, and phosphate ingredients, then all particle facets are intact and show no sign of destruction. It appears that the H2O2 decomposition activates the LNMO surface, generating perfect conditions for the homogeneous deposition of the Li, Al, Ti, and phosphate ions. Electrochemical investigations show a very slow fading process during the cycling, and even after more than 500 cycles, the obtained cathode material shows a high specific capacity of 127 mAh g–1 (at 1 C) (∼98% capacity retention) and an excellent Coulombic efficiency (99.5%).

Verlagsausgabe §
DOI: 10.5445/IR/1000133678
Veröffentlicht am 07.06.2021
DOI: 10.1021/acsaem.1c00160
Zitationen: 3
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2021
Sprache Englisch
Identifikator ISSN: 2574-0962, 2574-0962
KITopen-ID: 1000133678
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in ACS applied energy materials
Verlag American Chemical Society (ACS)
Band 4
Heft 5
Seiten 4271–4276
Vorab online veröffentlicht am 22.04.2021
Nachgewiesen in Web of Science
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