以乳酸镁做为Mg2+的掺杂源和部分的碳源, 在惰性氛围下用模板-固相合成法合成了掺Mg2+的LiFePO4/C复合正极材料, 考察了Mg2+对于目标化合物电化学和物理性能的影响. 研究结果表明, 在C/3倍率下材料掺杂前后第二个循环的放电容量分别为140.5和159.9mAh/g, 循环20次后容量为140.4 和162.1mAh/g. 电化学交流阻抗表明, 掺杂后的材料阻抗Rct从180Ω 减小到120Ω. 掺杂后振实密度比掺杂前提高了0.229g·cm-3.
Stoichiometric Mg doped LiFePO4/C cathode material was synthesized through a templatesolid state reaction in an inert atmosphere using magnesium lactate as dopant and part of carbon source. Effects of Mg2+ doping on the electrochemical and physical performances of the cathode materials were investigated. At 1/3C discharge rate, the secondly reversible specific capacity of the Mg-doped LiFePO4/C is nearly 20mAh/g higher than that of the undoped one. After 20 cycles, the capacity of the former is 162.1mAh/g, 22mAh/g higher than that of the latter. Impedance R ct of the Mg-doped material is 120Ω, while that of the undoped material is 180Ω. The tap density of Mg-doped material is
also improved by 0.229g·cm-3 compared with undoped material.
参考文献
| [1] | Padhi A K, Nanjundaswamy K S, Goodenought J B. J. Electrochem. Soc., 1997, 144 (4): 1188--1194. [2] Hyung S K, Byung W C, Won I C. J. Power Source, 2004, 132: 235--239. [3] Takahashi M, Tobishima S, Takei K, et al. Solid State Ionics, 2002, 148: 283--289. [4] Chung S Y, Bloking J T, Chiang Y M. Nat Mater, 2002, 1 (2): 123--128. [5] Prosini P P, Lisi M, Zane D, et al. Solid State Ionics, 2002, 148: 45--51. [6] Yamada A, Chung S C, Hinokuma K. J. Electrochem. Soc., 2001, 148 (3): A224--A229. [7] Park K S, Son J T, Chung H T, et al. Solid State Commun., 2004, 129: 311--314. [8] Huang H, Yin S C, Nazar L F. Electrochem and Solid State Lett., 2001, 4 (10): A170--A172. [9] 卢俊彪, 唐子龙, 张中太, 等(LU Jun-Biao, et al). 无机材 料学报(Journal of Inorganic Material), 2005, 20 (3): 666--669. [10] Ravet N, Goodenough J B, Besner S, et al. The 1999 Joint International Meeting, Honolulu, Hawaii, 1999. 17--22. [11] YANG Shu-ting, ZHAO Na-hong, DONG Hong-yu, et al. Electrochim Acta, 2005, 51: 166--171. [12] Chen Z, Dahn J R. J. Electrochem. Soc., 2002, 149: A1184--A1189. [13] Chung S Y, Chiang Y M. Electrochem and Solid State Lett., 2003, 6 (12): A278--A281. [14] Herle P S, Ellis B, Coombs N, et al. Nat. Mater, 2004, 3 (3): 147--152. [15] 卢俊彪, 唐子龙, 张中太, 等(LU Jun-biao, et al). 物理 化学学报(Acta Phys.-Chim. Sin.), 2005, 21 (3): 319--323. |
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