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Combining Optimized Particle Morphology with a Niobium‐Based Coating for Long Cycling‐Life, High‐Voltage Lithium‐Ion Batteries
Author(s) -
Gabrielli Giulio,
Axmann Peter,
Diemant Thomas,
Behm Rolf Jürgen,
WohlfahrtMehrens Margret
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201600278
Subject(s) - graphite , materials science , lithium (medication) , dielectric spectroscopy , electrochemistry , niobium , cathode , coating , chemical engineering , cycling , particle (ecology) , nanotechnology , electrode , composite material , chemistry , metallurgy , medicine , oceanography , archaeology , geology , engineering , history , endocrinology
Morphologically optimized LiNi 0.5 Mn 1.5 O 4 (LMNO‐0) particles were treated with LiNbO 3 to prepare a homogeneously coated material (LMNO‐Nb) as cathode in batteries. Graphite/LMNO‐Nb full cells present a twofold higher cycling life than cells assembled using uncoated LMNO‐0 (graphite/LMNO‐0 cell): Graphite/LMNO‐0 cells achieve 80 % of the initial capacity after more than 300 cycles whereas for graphite/LMNO‐Nb cells this is the case for more than 600 cycles. Impedance spectroscopy measurements reveal significantly lower film and charge‐transfer resistances for graphite/LMNO‐Nb cells than for graphite/LMNO‐0 cells during cycling. Reduced resistances suggest slower aging related to film thickening and increase of charge‐transfer resistances when using LMNO‐Nb cathodes. Tests at 45 °C confirm the good electrochemical performance of the investigated graphite/LMNO cells while the cycling stability of full cells is considerably lowered under these conditions.