share
Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (02): 117-121. Next Articles
Full Papers
赵煜娟*,赵春松,孙召琴,冯海兰
投稿日期:
修回日期:
发布日期:
通讯作者:
ZHAO Yu-Juan, ZHAO Chun-Song, SUN Zhao-Qin, FENG Hai-Lan
Received:
Revised:
Published:
Share
The Li-rich cathode materials Li[CoxLi(1/3-x/3)Mn(2/3-2x/3)]O2 with different Co contents (x=0.4, 0.5, 0.6) were synthesized by modified Pechini method. The results of XRD confirmed that the crystals of the Li-rich compounds possess layered structure and have good crystallinity. The initial discharge capacities of the compounds are high between 200~220 mAh/g, increasing with the increase of Co contents. The material with x=0.4 exhibits the best cycling property. The capacity retainment is about 75% after 50 cycles at 0.5 C (100 mA/g). The peak of Mn4+/Mn3+occurred below 3.5 V in the plots of dQ/dV, and the area of the peak increases with the cycle numbers. The results of the XRD during the cycling process show the layer structure of the Li-rich materials transfers to the spinel phase, and the impurities appears during the cycling, resulting in the capacity fade.
Key words: lithium ion batterie, Li-rich cathode material, modified Pechini method, electrochemical behaviors
ZHAO Yu-Juan, ZHAO Chun-Song, SUN Zhao-Qin, FENG Hai-Lan. Synthesis and Characterization of Li-rich Cathode Materials Li[Li(1/3-x/3)CoxMn(2/3-2x/3)]O2 by Modified Pechini Method[J]. Acta Chimica Sinica, 2011, 69(02): 117-121.
Export EndNote|Reference Manager|ProCite|BibTeX|RefWorks