Abstract
Two components of the xLi2MnO3-yLiNi1/3Co1/3Mn1/3O2 have the same framework offer good structure compatibility, but exist large irreversible capacity loss[1] and structure transformation[ 2 ] when initially charged to 4.5V or higher. Hence there are many researchers focus their interest to investigate the possibility of integrating core-shell structure on reducing the irreversible capacity loss and improving cycle stability[3]. This paper is mainly on the improvement of electrochemical properties of 0.4Li2MnO3-0.6LiNi1/3Co1/3Mn1/3O2. The core cathode material was prepared from co-precipitation process. And the Shell material of LiNi0.5Mn1.5O2 has been integrated onto the surface of the core material using with assistance of PVP, since PVP has an effect of constraining particle size. After absolutely dried, both the coated and pristine samples were post-treated at the same thermal condition (Figure1).Figure 2(a). presents a compare of first charge-discharge process of the coated and pristine sample, a remarkable change in the activate process, as coating bring up first cycle efficiency from 73.3% to 83.7% operated at a voltage of 2.0~4.8V vs Li0 at an current rate of c/20(1c=250mAh/g).Figure 2(b). shows an enhancement of cycling properties after coated. Figure 1
Published Version
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