采用软溶胶-凝胶技术在金属Ni基体上一步合成LiCoO2薄膜电极.其合成条件是:含钴离子和锂离子的溶液、反应温度100℃、反应压力0.1MPa、电流密度0～10mA/cm2、反应时间20h.XRD、XPS、SEM、循环伏安和恒电流充、放电等测试表明:薄膜电极LiCoO2晶体为R3m型结构;薄膜具有(101)方向的择优取向,其大小均匀、直径约为0.3μm的晶粒层状生长,层与层之间结合较紧密且有较多微孔;薄膜电极表现为多孔电极,具有良好的电性能.软溶胶-凝胶法制备薄膜电极,工艺流程短、能耗低,具有很大的发展潜力.
Thin films of lithium cobalt oxides were synthesized by the soft solution processing in a home-made solution. Films of LiCoO2 were deposited
onto nickel substrates at 100℃ without any postsynthesis annealing. Their structure and chemical composition were checked by
X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectrometry, cyclic voltammograms, and galvanostatic charge-discharge
pattern analysis. The prepared LiCoO2 films show R3m crystallinity and preferred orientation of (101). the films grow layer by layer with
homogenous grains, whose diameters are about 0.3μm. The thin-film electrode displays a good cyclic character and its first discharge capacity is
143mAh/g. LiCoO2 films made by soft solution processing can be used as cathode materials in lithium microbatteries.
参考文献
| [1] | Kang S G, Kang S Y. Solid State Ionics, 1999, 120: 155--161. [2] Youg-Min Coi, Su Pyum. J. Power Sources, 1998, 72: 83--87. [3] Bruno Scrosati. Electrochemica Acta, 2000, 45 (2): 461--465. [4] Robert A A, Bruce Peter G. Nature, 1996, 381: 499--500. [5] 詹晖, 周运鸿. 电源技术, 1999, 23 (增刊): 102--105. [6] Yamada K, Sato N, Fujino T, et al. J. of Solid State electrochemistry, 1999, 3 (3): 148--153. [7] Delmas C, Menetrier M, Croguenne L, et al. Electrochimica Acta, 1999, 45: 45--48. [8] Julien C, Camacho-Lopez M A, Escobar-Alarcon L, et al. Materials Chemistry and Physics, 2001, 68: 210--216. [9] Wang B, Bates J B, Hart F X, et al. J. Electrochem. Soc., 1996, 143 (10): 3203--3213. [10] Mashiro Yoshimura, et al. Solid State Ionics, 1997, 98: 197--208. [11] Mashiro Yoshimura. J. Mater. Res., 1998, 13 (4): 796--802. [12] Kyoo-Seung Han, et al. Chem. Mater., 1998, 10: 2183--2188. [13] 曲喜新, 过壁君. 薄膜物理, 第一版. 北京: 电子工业出版社, 1994. 89--91. [14] 龚竹青. 理论电化学导论, 第一版. 长沙: 中南工业大学出版社, 1988. 413--414. |
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