Microstructure effect on the electrochemical property of Li 4Ti 5O 12 as an anode material for lithium-ion batteries

Porous (P-) and dense (D-) lithium titanate (Li 4Ti 5O 12) powders as an anode material for lithium-ion batteries have been synthesized by spray drying followed by solid-state calcination. Electrochemical testing results showed that the discharge capacities of P-Li 4Ti 5O 12 are 144 mAh/g, 128 mAh/g...

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Bibliographic Details
Published inElectrochimica acta Vol. 53; no. 24; pp. 7242 - 7247
Main Authors Hsiao, Kuang-Che, Liao, Shih-Chieh, Chen, Jin-Ming
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2008
Subjects
Anode
Dense
Li 4Ti 5O 12
Lithium-ion batteries
Porous
Lithium-ion batteries
Dense
Anode
Li 4Ti 5O 12
Porous
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Summary:Porous (P-) and dense (D-) lithium titanate (Li 4Ti 5O 12) powders as an anode material for lithium-ion batteries have been synthesized by spray drying followed by solid-state calcination. Electrochemical testing results showed that the discharge capacities of P-Li 4Ti 5O 12 are 144 mAh/g, 128 mAh/g and 73 mAh/g at the discharging rate of 2 C, 5 C and 20 C, respectively (cut-off voltages: 0.5–2.5 V). The corresponding values for D-Li 4Ti 5O 12 are 108 mAh/g, 25 mAh/g and 17 mAh/g. The higher capacity of the P-Li 4Ti 5O 12 at high charge/discharge rates was attributed to the shorter transport path of Li ions and higher electronic conductivity in the P-Li 4Ti 5O 12 as a result of its smaller primary particle size and higher surface area compared with those of the D-Li 4Ti 5O 12.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2008.05.002