The influence of Li2O incorporation on the electrochemical properties of Li4Ti5O12 thin film electrodes

High quality Li4Ti5O12 anode films were deposited by radio-frequency co-sputtering Li4Ti5O12 and Li2O targets on Pt-coated stainless steel substrates. The use of an additional Li2O target not only compensated the lithium content in the resulting layers but also decreased the impurity content. Conseq...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-09, Vol.801, p.550-557
Main Authors: Xiao, Cheng-Fan, Kim, Jong Heon, Choi, Daehwan, Park, Yun Chang, Kim, Jung Hyun, Park, Jozeph, Kim, Yong Joo, Kim, Hyun-Suk
Format: Article
Language:English
Subjects:
Anodes
Co-sputtering
Discharge
Electrochemical analysis
Li2O
Li4Ti5O12
Lithium oxides
Lithium-ion battery
Properties (attributes)
Sputtering
Stainless steels
Substrates
Thin film
Thin films
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Summary:High quality Li4Ti5O12 anode films were deposited by radio-frequency co-sputtering Li4Ti5O12 and Li2O targets on Pt-coated stainless steel substrates. The use of an additional Li2O target not only compensated the lithium content in the resulting layers but also decreased the impurity content. Consequently, the electrochemical properties of the Li4Ti5O12 anode exhibited better electrochemical properties than an identical film prepared using a single Li4Ti5O12 target. Upon annealing, the co-sputtering Li4Ti5O12 showed a relatively high discharge capacity of 618 mAh/cm3 (theoretical specific capacity of 598.5 mAh/cm3) at a current density of 0.1 C. Also, superior high rate capability with a discharge capacity of 309 mAh/cm3 at 20 C was observed, accompanied by an excellent cycling stability, with a capacity retention ratio exceeding 94% after 500 cycles at 1 C. The co-sputtering using Li2O target is most likely to have enhanced the electrochemical properties of the pure Li4Ti5O12 anode. •Co-sputtering of Li2O and Li4Ti5O12 target during the growth of LTO anode layer.•The growth of high purity spinel LTO film by accommodating Li2O into Li deficient sites.•LTO exhibits superior electrochemical performance with excellent rate capability and cycling performance.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.06.151