期刊
RSC ADVANCES
卷 3, 期 19, 页码 6847-6852出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra22862b
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资金
- 973 project of China [2011CB935901]
- National Natural Science Foundation of China [91022033, 21203111]
- Shandong Provincial Natural Science Foundation for Distinguished Young Scholar [JQ201205]
- Independent Innovation Foundation of Shandong University [2012 ZD007]
- start-up funding for new faculties in Shandong University
- China Postdoctoral Science Foundation [2012M511490]
- Special Fund for Postdoctoral Innovation Program of Shandong Province [201102022]
Olivine structured LiMnPO4 nanorods as an emerging cathode material for lithium ion batteries have recently triggered intensive interest. Herein, LiMnPO4 nanorods have been synthesized via a solvothermal route and then coated with a carbon layer from different carbon sources to improve their electrochemical performance. The LiMnPO4-C nanocomposite obtained from beta-cyclodextrin as the carbon source showed a reversible capacity of 153.4 mA h g (1) at a rate of 0.1 C and maintained it at 120 mA h g (1) after 50 cycles, which is much better than that obtained from ascorbic acid, citric acid, glucose and sucrose. This result can be attributed to the smaller electrode impedance in the nanocomposite obtained from betacyclodextrin, based on EIS measurements. Correlated to the molecule structure, it is believed that larger molecules with more oxygenous groups are beneficial to their uniform adsorption on the electrodes and then produce a better electron-conductive carbon layer after calcinations. This result would be very helpful in future work related to carbon coating on other electrodes.
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