以多壁碳纳米管(Multi-walled carbon nanotubes,MWCNTs)为添加相,对锰酸锂进行电化学性能改进,采用扫描电子显微镜对其进行观察,发现掺入的多壁碳纳米管均匀分布在锰酸锂颗粒表面.以改性后的锰酸锂为主要材料制成纽扣电池,采用交流阻抗及恒电流充放电等技术进行检测.结果表明,掺入1％ MWCNTs后LiMn2O4的初始放电容量由改性前的123mAh/g下降到改性后的117mAh/g,在25℃经10次循环后容量保持率为97％,明显高于未掺入的91％.与未掺杂的LiMn2O4相比,虽然掺C或掺CNTs都使初始充放电容量有所降低,但是其循环性能明显提高.
参考文献
| [1] | Xia Y Y;Sakai T;Fujieda T et al.Correlating capacity fading and structural changes in Li1+yMn2-yO4-δ spinel cathode materials[J].Journal of the Electrochemical Society,2001,148(09):723. |
| [2] | Han Y S;Kim H G .Synthesis of LiMn2O4 by modified pechini methode and characterization as a cathode for rechargeable Li/LiMn2 O4 cells[[J].Journal of Power Sources,2000,88(02):161. |
| [3] | Deng B H;Nakamura H;Yoshio M .Comparison and improvement of the high rate perform ance of diferent types of LiMn2O4 spinels[J].Journal of Power Sources,2005,141(01):116. |
| [4] | Sano M;Hattori T;Hibino T et al.Improved LiMn2O4/graphite Liion cells at 55℃[J].Electrochemical and Solid-State Letters,2007,10(12):270. |
| [5] | Liu Z;Yu A;Lee J Y .Cycle life improvement of LiMn2O4cathode in rechargeable lithium batteries[J].Journal of Power Sources,1998,74(02):228. |
| [6] | Pasquier A D;Blyr A;Courjal P et al.Mechanism for limited 55℃ storage performance of Li1.05 Mn1.95 O4 electrodes[J].Journal of the Electrochemical Society,1999,146(02):428. |
| [7] | 刘金练,吴显明,陈上,何则强,许名飞.尖晶石锰酸锂表面化学镀钴研究[J].精细化工,2010(08):800-803,808. |
| [8] | Lijima C .Helical microtubules of graphitic carbon[J].Nature,1991,354:56. |
| [9] | 孙晓刚,程利,杜国平.阵列式碳纳米管雷达波吸收性能研究[J].人工晶体学报,2009(05):1114-1118. |
| [10] | 吴宇平;张汉平;吴锋.聚合物锂离子电池[M].北京:化学工业出版社,2007 |
| [11] | J. S. Sakamoto;B. Dunn .Vanadium Oxide-Carbon Nanotube Composite Electrodes for Use in Secondary Lithium Batteries[J].Journal of the Electrochemical Society,2002(1):A26-A30. |
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