锂离子电池,又被称作"摇椅电池",具有体积小、质轻的特点;理论容量高达274mAh/g的正极材料LiNiO2极受研究关注,以镁掺杂锂镍氧化物,能有效提高充放电循环稳定性,并于Li+脱嵌时提供支柱作用(pillaring effect),因之少量掺镁可有效改进LiNiO2之电化学性能.本实验以XRD依据I(003)/I(104)峰比值、R-factor(I(006)+I(102))/I(101)峰比值、I(108)与I(110)的峰分裂,探讨在不同煅烧温度、煅烧时间、升温速率、试样压片的压强大小、气氛等变数条件所合成之锂镍镁氧化物LiNi0.95Mg0.05O2.发现以210～280 MPa对试样压片,在氧气气氛下经2℃/min升温速率升温至600℃,预烧9～15h后,再粉碎、压片以5℃/min升温至600℃之后以1℃/min升温至750℃恒温15～20h,可得I(003)/I(104)峰比值1～1.1,R-factor(I(006)+I(102))/(101)峰比值0.67～0.94,并且有(108)与(110)的分裂峰,同时c/a比值4.914～4.925,属于R3m空间群的锂镍镁氧化合物.
参考文献
| [1] | Rougier R;Gravereau P;Delmas C .[J].Solid State Ionics,1996,143:1168. |
| [2] | Ohzuku T;Ueda A;Nagayama M .[J].Journal of the Electrochemical Society,1993,140:1862. |
| [3] | Dahn J;Fuller E;Obrovac M et al.[J].Solid State Ionics,1994,69:265. |
| [4] | Arai H;Okada S;Sakurai Y;Yamaki J .[J].Solid State Ionics,1994,69:295. |
| [5] | Pouillerie C.;Croguennec L. .Synthesis and characterization of New LiNi_(1-y)Mg_yO_2 Positive Electrode Materials for Lithium Ion Batteries[J].Journal of the Electrochemical Society,2000(6):2061-2069. |
| [6] | Pouillerie C.;Delmas C.;Croguennec L. .The LixNi1-yMgyO2 (y=0.05, 0.10) system: structural modifications observed upon cycling[J].Solid state ionics,2000(1/2):15-29. |
| [7] | Pouillerie C;Perton F;Biensen Ph et al.[J].Journal of Power Sources,2001,96:293. |
| [8] | Gao Y;Yakovieva M;Ebner W .Electrochem[J].Solid State Lett,1998,1:117. |
| [9] | Reimers J;Rossen E;Jones C .[J].Solid State Ionics,1990,44:87. |
| [10] | Hwang B;Santhanam R;Chen C .[J].Journal of Power Sources,2003,114:244. |
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%