期刊
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
卷 62, 期 1, 页码 98-110出版社
SPRINGER
DOI: 10.1007/s10971-012-2691-0
关键词
Phosphoolivines; Disordered CNFs/LiCoPO4 composite; Triethyl phosphite-and triethyl phosphate-based sol-gel method; Li extraction/insertion mechanism
资金
- DFG [EH183/3, SPP1181]
- Bundesministerium fur Bildung und Foschung (BMBF) [03KP801]
LiCoPO4-coated disordered carbon nanofibers (CNFs/LiCoPO4) were obtained by a sol-gel method, using triethyl phosphite or triethyl phosphate as the phosphorous source. The crystal structure of the products was analyzed by X-ray powder diffraction, while morphology was studied using scanning electron microscopy, transmission electron microscopy, Auger electron spectroscopy and X-ray photoelectron spectroscopy. Optimal synthesis conditions for the CNFs/LiCoPO4 in light of the best electrochemical performance are discussed. The best discharge capacity 105 mAh/g (or ca. 63% of the theoretical capacity) shows the material with 40% CNFs/LiCoPO4 and addition coating by carbon black. This composition has a best purity of active materials and point coverage of CNFs. The X-ray photoelectron C1s spectra of the CNFs surface without and with sputter erosion show enhancement of C-O bonds at the fiber surface, which does not influence significantly electrochemical behavior of the composite materials.
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