锰酸锂的掺杂改性及锂离子动力电池的工艺设计

发布时间：2018-05-30 22:47

  本文选题：锂离子动力电池 + LiMn_2O_4　； 参考：《长沙矿冶研究院》2014年硕士论文

【摘要】：本论文以改善尖晶石型LiMn_2O_4的循环性能,提升尖晶石型LiMn_2O_4高倍率放电性能为目的,采用电化学研究手段与XRD和SEM等技术相结合,对尖晶石型LiMn_2O_4的合成与改性进行了详细的研究。同时,为了加强对尖晶石型LiMn_2O_4的深入认识,完善尖晶石型LiMn_2O_4的评价体系,将电化学研究手段与安全性能测试等相结合,对动力电池的工艺设计进行了研究。采用高温固相法制备了尖晶石型LiMn_2O_4。研究了合成条件对尖晶石型LiMn_2O_4性能的影响。结果表明,尖晶石型LMn_2O_4为Li/Mh=1.15:2,在750℃下烧结12～20h制得的样品,既能保持较好电化学性能,又拥有较高的振实密度。采用F-对尖晶石型LiMn_2O_4进行掺杂改性。研究了不同F-掺杂量对LiMnO4-xFx性能的影响。结果表明,尖晶石型LiMn2O3.94F0.06的电性能最好,0.1C首次放电比容量为109.0 mAh/g;1C放电比容量为104.4 mAh/g,循环40周容量保持率为98.18%。采用A13+、La3+对尖晶石型LiMn_2O_4进行复合阳离子掺杂改性。研究了不同Al3+、La3+掺杂量对LiAlx1Lax2Mn2-x1-x2O4性能的影响。结果表明,LiAl0.02La0.02Mn1.96O4的电性能最好,0.1C放电比容量为102.3 mAh/g,0.2C、1C、2C和5C与0.1C放电比容量的比率为99.2%、96.3%、94.8%和87.8%,循环性能良好。采用商业化的尖晶石型LiMn_2O_4制作183665AR型动力电池。进行了原料筛选,研究了不同正极面密度、压实密度、导电剂含量及正负极料量比对电池性能的影响,并对优化后的电池进行了安全性能检测。结果表明,采用厂家B的尖晶石型LiMn_2O_4作为正极材料,AGP-3作为负极材料,当正极片面密度为3.3g·dm-2、压实密度为2.8g·cm-3、正极导电剂含量为5%、正负极料量比为1：1.05时,电池的综合性能最佳。
[Abstract]:In order to improve the cycling performance of spinel LiMn_2O_4 and to improve the high rate discharge performance of spinel LiMn_2O_4, the synthesis and modification of spinel LiMn_2O_4 were studied in detail by means of electrochemical research combined with XRD and SEM techniques. In order to enhance the understanding of spinel LiMn_2O_4 and improve the evaluation system of spinel type LiMn_2O_4, the process design of power battery was studied by combining electrochemical research with safety performance test. Spinel limn _ 2O _ 4 was prepared by high temperature solid state method. The effect of synthesis conditions on the properties of spinel LiMn_2O_4 was studied. The results show that the spinel type LMn_2O_4 is 1. 15: 2 Li / Mh, sintered at 750 鈩，

本文编号：1957175