以五氧化二钒和过氧化氢为原料,采用溶胶-凝胶法合成片状V2O5,再采用化学氧化法,通过改变氧化剂的加入顺序,制备出了不同结构的五氧化二钒/聚吡咯(V2O5/PPy)复合材料.运用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和比表面积(BET)表征了材料的结构和形貌,用四探针测试了材料的电导率.结果表明,氧化剂的加入方式不同,所得复合材料结构和形貌明显不同.先加氧化剂时,吡咯在V2O5的层间聚合,XRD测试表明所得复合材料的主要衍射峰对应的层间距由0.40806 nm(V2O5)增大到0.41019 nm;而先加入吡咯单体时,吡咯在V2O5的表面吸附聚合,复合材料的层间距没有明显变化.先加入氧化剂所得复合材料具有最高的放电比容量(271.8 mAh/g),并且循环50次后,仍有225.4 mAh/g的放电比容量.
参考文献
| [1] | S.H. Ng;S.Y. Chew;J. Wang;D. Wexler;Y. Tournayre;K. Konstantinov;H.K. Liu .Synthesis and electrochemical properties of V_2O_5 nanostructures prepared via a precipitation process for lithium-ion battery cathodes[J].Journal of Power Sources,2007(2):1032-1035. |
| [2] | D. Zhu;H. Liu;L. Lv .Hollow microspheres of V_2O_5 and Cu-doped V_2O_5 as cathode materials for lithium-ion batteries[J].Scripta materialia,2008(6):642-645. |
| [3] | Fritz Huguenin;Emerson M. Girotto;Roberto M. Torresi;Daniel A. Buttry .Transport properties of V_2O_5/polypyrrole nanocomposite prepared by a sol-gel alkoxide route[J].Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry,2002(1/2):37-45. |
| [4] | Saleta, ME;Curiale, J;Troiani, HE;Guevara, SR;Sanchez, RD;Malta, M;Torresi, RM .Magnetic characterization of vanadium oxide/polyaniline nanotubes[J].Applied Surface Science,2007(1):371-374. |
| [5] | Goward GR.;Nazar LF.;Leroux F. .Poly(pyrrole) and poly(thiophene)/vanadium oxide interleaved nanocomposites: positive electrodes for lithium batteries[J].Electrochimica Acta,1998(10/11):1307-1313. |
| [6] | Yu Chen;Heng Liu;Wang-Ling Ye .Preparation and electrochemical properties of submicron spherical V_2O_5 as cathode material for lithium ion batteries[J].Scripta materialia,2008(3):372-375. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%