采用聚乙二醇辅助的溶胶-凝胶法制备了锂离子电池复合正极材料LiCo1-xVxPO4/C(x=0、0.03和0.05).X射线衍射(XRD)表明掺杂的V进入了LiCoPO4晶格内部.扫描电镜(SEM)和透射电镜(TEM)显示LiCo0.97V0.03PO4/C的粒径分布在200～700nm之间,颗粒表面包覆一层约30nm厚的碳层.在0.1C倍率下,LiCo0.97V0.03PO4/C和LiCoPO4/C的首次放电容量分别为111和70mAh/g.掺杂V不仅能够改善材料的循环稳定性而且提高了材料的放电电压平台.
参考文献
| [1] | Padhi AK.;Goodenough JB.;Nanjundaswamy KS. .PHOSPHO-OLIVINES AS POSITIVE-ELECTRODE MATERIALS FOR RECHARGEABLE LITHIUM BATTERIES[J].Journal of the Electrochemical Society,1997(4):1188-1194. |
| [2] | Yung-Da Cho;George Ting-Kuo Fey;Hsien-Ming Kao .The effect of carbon coating thickness on the capacity of LiFePO_4/C composite cathodes[J].Journal of Power Sources,2009(1):256-262. |
| [3] | Yonemura M;Yamada A;Takei Y;Sonoyama N;Kanno R .Comparative kinetic study of olivine LixMPO4 (M = Fe, Mn)[J].Journal of the Electrochemical Society,2004(9):A1352-A1356. |
| [4] | Wolfenstine J;Allen J .[J].Journal of Power Sources,2005,142(1-2):389-390. |
| [5] | Osorio-Guillén J M;Holm B;Ahuja R et al.[J].Solid-State Ionicis,2004,167(3-4):221-227. |
| [6] | Tomoyuki Shiratsuchi;Shigeto Okada;Takayuki Doi;Jun-ichi Yamaki .Cathodic performance of LiMn{sub}(1-x)M{sub}xPO{sub}4 (M=Ti, Mg and Zr) annealed in an inert atmosphere[J].Electrochimica Acta,2009(11):3145-3151. |
| [7] | Li HH;Jin J;Wei JP;Zhou Z;Yan J .Fast synthesis of core-shell LiCoPO4/C nanocomposite via microwave heating and its electrochemical Li intercalation performances[J].Electrochemistry communications,2009(1):95-98. |
| [8] | Han DW;Kang YM;Yin RZ;Song MS;Kwon HS .Effects of Fe doping on the electrochemical performance of LiCoPO4/C composites for high power-density cathode materials[J].Electrochemistry communications,2009(1):137-140. |
| [9] | Yang M R;Ke W H;Wu S H .[J].Journal of Power Sources,2005,146(1-2):539-543. |
| [10] | Chung S Y;Bloking J T;Chiang Y M .[J].Nature Materials,2002,1(02):123-128. |
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%