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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Published in | Electrochimica acta Vol. 53; no. 24; pp. 7242 - 7247 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
2008
|
Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 0013-4686 1873-3859 |
DOI: | 10.1016/j.electacta.2008.05.002 |