Growth of LiFePO₄ nanoplatelets with orientated (010) facets on graphene for fast lithium storage

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• 作者：Bo Wang ; Shuo Wang ; Peng Liu ; Jie Deng ; Binghui Xu ; Tiefeng Liu ; Dianlong Wang ; X.S. Zhao
• 关键词：Lithium ion battery ; LiFePO4 ; Electrochemical ; Graphene ; Crystal orientation
• 刊名：Materials Letters
• 出版年：1 March, 2014
• 年：2014
• 卷：118
• 期：Complete
• 页码：137-141
• 全文大小：1845 K

文摘

Both electron transfer and Li-ion diffusion are the key factors limiting rapid lithium storage in anisotropic LiFePO₄ electrode materials. In this work, graphenes were used to in situ anchor LiFePO₄ nanoplatelets (LFP NPs) with orientated (010) facets to prepare a unique LiFePO₄-graphene composite (LFP@GNs). Electron microscope images revealed the nanoplatelet morphology of LiFePO₄ crystals as well as the graphene crossed-linked structure of LFP@GNs. X-ray diffraction and high-resolution transmission electron microscopy results demonstrated the orientated growth of LFP nanoplatelets along the ac-facet. LFP@GNs exhibited a superior rate capability with a discharge capacity of 126 mAh g^鈭? at 20C, as well as an excellent cycling stability without capacity fading after 600 cycles at 10C.