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2017 ; 8
(ä): 15636
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Hierarchically structured lithium titanate for ultrafast charging in long-life
high capacity batteries
#MMPMID28548100
Odziomek M
; Chaput F
; Rutkowska A
; ?wierczek K
; Olszewska D
; Sitarz M
; Lerouge F
; Parola S
Nat Commun
2017[May]; 8
(ä): 15636
PMID28548100
show ga
High-performance Li-ion batteries require materials with well-designed and
controlled structures on nanometre and micrometre scales. Electrochemical
properties can be enhanced by reducing crystallite size and by manipulating
structure and morphology. Here we show a method for preparing hierarchically
structured Li(4)Ti(5)O(12) yielding nano- and microstructure well-suited for use
in lithium-ion batteries. Scalable glycothermal synthesis yields
well-crystallized primary 4-8?nm nanoparticles, assembled into porous secondary
particles. X-ray photoelectron spectroscopy reveals presence of Ti(+4) only;
combined with chemical analysis showing lithium deficiency, this suggests oxygen
non-stoichiometry. Electron microscopy confirms hierarchical morphology of the
obtained material. Extended cycling tests in half cells demonstrates capacity of
170?mAh?g(-1) and no sign of capacity fading after 1,000 cycles at 50C rate
(charging completed in 72?s). The particular combination of nanostructure,
microstructure and non-stoichiometry for the prepared lithium titanate is
believed to underlie the observed electrochemical performance of material.