發(fā)布時間：2018-05-30 22:47

  本文選題：鋰離子動力電池 + LiMn_2O_4�。� 參考：《長沙礦冶研究院》2014年碩士論文

【摘要】：本論文以改善尖晶石型LiMn_2O_4的循環(huán)性能,提升尖晶石型LiMn_2O_4高倍率放電性能為目的,采用電化學(xué)研究手段與XRD和SEM等技術(shù)相結(jié)合,對尖晶石型LiMn_2O_4的合成與改性進(jìn)行了詳細(xì)的研究。同時,為了加強(qiáng)對尖晶石型LiMn_2O_4的深入認(rèn)識,完善尖晶石型LiMn_2O_4的評價體系,將電化學(xué)研究手段與安全性能測試等相結(jié)合,對動力電池的工藝設(shè)計進(jìn)行了研究。采用高溫固相法制備了尖晶石型LiMn_2O_4。研究了合成條件對尖晶石型LiMn_2O_4性能的影響。結(jié)果表明,尖晶石型LMn_2O_4為Li/Mh=1.15:2,在750℃下燒結(jié)12～20h制得的樣品,既能保持較好電化學(xué)性能,又擁有較高的振實密度。采用F-對尖晶石型LiMn_2O_4進(jìn)行摻雜改性。研究了不同F(xiàn)-摻雜量對LiMnO4-xFx性能的影響。結(jié)果表明,尖晶石型LiMn2O3.94F0.06的電性能最好,0.1C首次放電比容量為109.0 mAh/g;1C放電比容量為104.4 mAh/g,循環(huán)40周容量保持率為98.18%。采用A13+、La3+對尖晶石型LiMn_2O_4進(jìn)行復(fù)合陽離子摻雜改性。研究了不同Al3+、La3+摻雜量對LiAlx1Lax2Mn2-x1-x2O4性能的影響。結(jié)果表明,LiAl0.02La0.02Mn1.96O4的電性能最好,0.1C放電比容量為102.3 mAh/g,0.2C、1C、2C和5C與0.1C放電比容量的比率為99.2%、96.3%、94.8%和87.8%,循環(huán)性能良好。采用商業(yè)化的尖晶石型LiMn_2O_4制作183665AR型動力電池。進(jìn)行了原料篩選,研究了不同正極面密度、壓實密度、導(dǎo)電劑含量及正負(fù)極料量比對電池性能的影響,并對優(yōu)化后的電池進(jìn)行了安全性能檢測。結(jié)果表明,采用廠家B的尖晶石型LiMn_2O_4作為正極材料,AGP-3作為負(fù)極材料,當(dāng)正極片面密度為3.3g·dm-2、壓實密度為2.8g·cm-3、正極導(dǎo)電劑含量為5%、正負(fù)極料量比為1：1.05時,電池的綜合性能最佳。
[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，

本文編號：1957175