科研之友
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摘要
Olivine structured LiCoPO4 was synthesized by a novel two-step process involving the hydrothermal synthesis of recently discovered metastable tetragonal LiCoPO4tetra and its transformation to the olivine-like phase. The transformation process does not change the size and shape of the particles so that they can be tailored by appropriate choice of the synthesis parameters and addition of organic compounds in the first production step. Our results demonstrate a clear effect of the particle shape on the electro-chemical performance. The material shows discharge capacities up to 107 mAh/g for flower-like secondary particles synthesized under the mediation of citric acid. Electrochemical impedance spectroscopy reveals a strong surface reaction during the delithiation process which is key for the capacity fade of LiCoPO4 battery materials and a difference of three orders of magnitude in the diffusion coefficient of lithiated and delithiated species is observed.
- 出版日期2015-10
