Data di Pubblicazione:
2024
Abstract:
The main request to be fulfilled for the wide distribution of electric vehicles is the availability of fast-charging lithium-ion
batteries (LIBs). However, fast charging accelerates the degradation of a battery, particularly at ambient temperature, and
the main responsible one is the anode compartment. The research is indeed devoted to developing new anode materials for
LIBs with outstanding performances at high rates. FeNb11O29
(FNO), a double shear phase, also known as a Wadsley–Roth
phase, with an intrinsic pseudocapacitance, was recently proposed as anode in LIBs, thanks to its high theoretical capacity
(400 mAh g−
1), high operating voltage (~ 1.6 V vs Li+/
Li) and an amazing structural stability. In this review, after the discussion
of strengths and weaknesses of FNO, the structural features of both its polymorphic forms, with a particular focus on
the niobium and iron neighbourhoods, will be described. Then, the working mechanism and the structure-electrochemistry
relationships will be treated, with an in-depth analysis of the pseudo-capacitive behaviour, i.e., the key to understand its
electrochemical performances. The strategies to mitigate its main drawbacks, i.e., the poor electronic conductivity and the
limited lithium diffusion, will be also dealt with. In the final paragraph, the electrochemical performances of some other
analogues niobates will be briefly described.
batteries (LIBs). However, fast charging accelerates the degradation of a battery, particularly at ambient temperature, and
the main responsible one is the anode compartment. The research is indeed devoted to developing new anode materials for
LIBs with outstanding performances at high rates. FeNb11O29
(FNO), a double shear phase, also known as a Wadsley–Roth
phase, with an intrinsic pseudocapacitance, was recently proposed as anode in LIBs, thanks to its high theoretical capacity
(400 mAh g−
1), high operating voltage (~ 1.6 V vs Li+/
Li) and an amazing structural stability. In this review, after the discussion
of strengths and weaknesses of FNO, the structural features of both its polymorphic forms, with a particular focus on
the niobium and iron neighbourhoods, will be described. Then, the working mechanism and the structure-electrochemistry
relationships will be treated, with an in-depth analysis of the pseudo-capacitive behaviour, i.e., the key to understand its
electrochemical performances. The strategies to mitigate its main drawbacks, i.e., the poor electronic conductivity and the
limited lithium diffusion, will be also dealt with. In the final paragraph, the electrochemical performances of some other
analogues niobates will be briefly described.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
FeNb11O29, LIBs, Fast charging, Wadsley Roth structure, Double shear phase
Elenco autori:
Bini, Marcella
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