采用环氧树脂为碳源制备出碳芯结构LiFePO4/C复合材料.利用X射线衍射、扫描电镜、透射电镜和X光电子能谱等分别对复合材料的晶体结构、表面形貌及表面成分进行表征,采用恒电流充放电和电化学阻抗方法研究试样的电化学性能.实验结果表明:碳芯结构复合材料是由无定形碳线和纳米LiFePO4颗粒组成.碳芯结构LiFePO4/C复合材料在15mA/g的电流密度下,首次放电容量达到166mAh/g,当电流密度增加到750mA/g,放电容量高达131mAh/g,经过50次循环后,容量保持率高达99.2%.
参考文献
[1] | Padhi A K,Nanjundaswamy K S,Goodenough J B.Phospho-olivines as positive-electrode materials for rechargeable lithium batteries.J.Electrochem.Soc.,1997,144(4):1188-1194. |
[2] | Kim J K,Choi J W,Ghanshyam S C,et al.Enhancement of electrochemical performance of lithium iron phosphate by controlled SolGel synthesis.Electrochimica Acta,2008,5(28):8258-8264. |
[3] | Dragana J,Miodrag M,Nikola C,et al.Synthesis of characterization of LiFePO4/C composite obtained by sonochemical method.Solid State Ionics,2008,179(11/12):415-419. |
[4] | Chung S Y,Jason T B,Chiang Y M.Electronically conductive phospho-olivines as lithium storage electrodes.Nature Materials,2002,1(2):123-128. |
[5] | 陈宇,王忠丽,于春洋,等(CHEN Yu,et al).掺杂Mo的LiFePO4正极材料的电化学性能.物理化学学报(Acta PhysicoChimica Sinica),2008,24(8):1498-1502. |
[6] | Liu H,Cao L,Fu L J,et al.Doping effects of zinc on LiFePO4 cathode material for lithium.Electrochem.Commun.,2006,8(10):1553-1557. |
[7] | 唐致远,高飞,薛建军(TANG Zhi-Yuan et al).Li0.97+δTi0.03Fe0.97Mn0.03PO4/C复合材料的制备及其电化学性能研究.无机材料学报(Journal of Inorganic Materials),2008,23(2):295-300. |
[8] | Shin H C,Park S B,Jang H,et al.Rate performance and structure change of Cr-doped LiFePO4/C during cycling.Electrochimica Acta,2008,53(27):7946~7951. |
[9] | 于锋,张敬杰,杨岩峰,等(YU Feng,et al).不同碳源对多孔球形LiFePO4/C复合材料的影响.无机化学学报(Chinese Journal of Inorganic Chemistry),2009,25(1):42-46. |
[10] | Maccario M,Croguennec L,Wattiaux A,et al.C-containing LiFePO4 materials-part 1:mechano-chemical synthesis and structure characterization.Solid State Ionics,2008,179(35/36):2020-2026. |
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