采用葡萄糖、环氧树脂、酚醛树脂为碳源制备了LiFePO_4/C复合材料.利用X射线衍射、扫描电镜等方法对复合材料进行研究.结果表明,葡萄糖获得了碳包覆复合材料,而环氧树脂、酚醛树脂则得到了碳芯结构复合材料.碳芯结构复合材料的电化学性能优于碳包覆复合材料,电流密度为15mA/g时,试样C、D的放电容量分别为165、167mAh/g;电流密度为600mA/g时,试样C、D的放电容量分别为139.4、145.5mAh/g,经过50循环后容量保持率分别高达99.2%、99.5%.
LiFePO4/C composites were synthesized by using glucose, epoxy resin and phenolic resin as carbon sources. LiFePO4/C composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results show that carbon-coated LiFePO4/C composite was acquired by using glucose, however LiFePO4/C composites with carbon core structure were acquired by using epoxy resin and phenolic resin. The electrochemical performances of LiFePO4/C composites with carbon core structure are more excellent than those of carbon-coated LiFePO4/C composite. When 15mA/g current was applied, the initial discharge capacities of samples C and D attain to 165, 167mAh/g, respectively. When 600mA/g current was applied, their discharge capacities are 139.4, 145.5mAh/g, and their capacity retention are 99.2% and 99.5% through 50 cycles, repectively.
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] | 甘晖,连锦明,童庆松.OP制备的LiFePO4/C的性能及碳的作用[J].电池,2008(06):339-342. |
| [3] | Dragana J;Miodrag M;Nikola C et al.[J].Solid State Ionics,2008,179:415-419. |
| [4] | 陈宇,王忠丽,于春洋,夏定国,吴自玉.掺杂Mo的LiFePO4正极材料的电化学性能[J].物理化学学报,2008(08):1498-1502. |
| [5] | Chung S Y;Bloking J T;Chiang Y M .[J].Nature Materials,2002,1(02):123-128. |
| [6] | 肖政伟,胡国荣,杜柯,彭忠东,邓新荣.高密度锂离子电池正极复合材料LiFePO4/C[J].中国有色金属学报,2007(12):2040-2045. |
| [7] | 雷敏,应皆荣,姜长印,万春荣.高密度球形LiFePO4的合成及性能[J].电源技术,2006(01):11-13. |
| [8] | 陈学军,赵新兵,曹高劭,马胜林,谢健,朱铁军.一步固相合成Nb掺杂LiFePO4/C及其电化学性能[J].中国有色金属学报,2006(10):1665-1671. |
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