期刊
ELECTROCHIMICA ACTA
卷 53, 期 24, 页码 7242-7247出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.05.002
关键词
lithium-ion batteries; porous; dense; anode; Li4Ti5O12
资金
- Ministry of Economic Affairs of Taiwan
Porous (P-) and dense (D-) lithium titanate (Li4Ti5O12) 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-Li4Ti5O12 are 144 mAh/g, 128 mAh/g and 73 mAh/g at the discharging rate of 2C, 5C and 20C, respectively (cut-off voltages: 0.5-2.5 V). The corresponding values for D-Li4Ti5O12 are 108 mAh/g, 25 mAh/g and 17 mAh/g. The higher capacity of the P-Li4Ti5O12 at high charge/discharge rates was attributed to the shorter transport path of Li ions and higher electronic conductivity in the P-Li4Ti5O12 as a result of its smaller primary particle size and higher surface area compared with those of the D-Li4Ti5O12. (c) 2008 Elsevier Ltd. All rights reserved.
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