Reversible lithium storage behaviour of aromatic diimide dilithium carboxylates

Electrochemical lithiation/delithiation studies are carried out on three different aromatic diimide lithium carboxylates. Among all, naphthalene diimide based dilithium carboxylate delivers a remarkably stable capacity of 134mAhg⿿1 at 2.24V vs. Li/Li+ over 125 cycles with a low polarization of 50mV....

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Bibliographic Details
Published in:Electrochimica acta 2016-03, Vol.193, p.80-87
Main Authors: Veerababu, M, Varadaraju, U.V, Kothandaraman, R
Format: Article
Language:English
Subjects:
aromatic diimide dilithium carboxylate
biphasic behavior in charge/discharge
Carboxylates
DFT
Diimide
Electron affinity
Lithium
Lithium storage
Mathematical analysis
Naphthalene
Polarization
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Summary:Electrochemical lithiation/delithiation studies are carried out on three different aromatic diimide lithium carboxylates. Among all, naphthalene diimide based dilithium carboxylate delivers a remarkably stable capacity of 134mAhg⿿1 at 2.24V vs. Li/Li+ over 125 cycles with a low polarization of 50mV. A striking feature is that, the lithiation/delithiation process is biphasic with excellent plateau behaviour in the voltage-composition profile. DFT calculations confirm the lower band gap and higher electron affinity for this compound.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2016.02.030