A high-performance LiCoPO4/C core/shell composite for Li-ion batteries
A high-performance LiCoPO4/C core/shell composite for Li-ion batteries
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DOI：
10.1016/j.electacta.2012.03.080
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发表时间：
2012-05
影响因子：
6.6
通讯作者：
J. Ni;Haibo Wang;Lijun Gao;Li Lu
中科院分区：
文献类型：
--
作者：
J. Ni;Haibo Wang;Lijun Gao;Li Lu
In this work, we report a LiCoPO4/C core/shell structure to address two key challenges facing the application of lithium cobalt phosphate (LiCoPO4), i.e. sluggish kinetics and poor cycle stability. By carefully controlling the synthetic procedure, we obtain a LiCoPO4material coated with a homogeneous carbon shell via an in situ approach. The carbon shell not only increases the reversible capacity, but also enhances the capacity retention upon repeated cycles. Electrochemical charge and discharge tests show that the LiCoPO4/C core/shell structure can deliver a high specific capacity of 131mAhg−1in the voltage range of 3.0–5.2V vs. Li+/Li and maintain 78% of initial capacity after 40 cycles at a low specific current of 17mAg−1. When discharged at 1C, the material still delivers a capacity of 95mAhg−1. The results indicate that the LiCoPO4/C composite is promising for energy storage application. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry, and AC impedance are applied to understand its good electrochemical performance.
