LiFePO₄-Fe₂P-C composite cathode: An environmentally friendly promising electrode material for lithium-ion battery

详细信息	查看全文 | 推荐本文 |

• 作者：Md. Mokhlesur Rahman^a ; ^c ; ^{mmr543@uowmail.edu.au} ; ^{m.rahman@deakin.edu.au} ; Jia-Zhao Wang^a ; Rong Zeng^a ; David Wexler^b ; Hua Kun Liu^a
• 关键词：Manual grinding ; LiFePO4&ndash ; Fe2P&ndash ; C composite ; Fe2P phase ; LiFePO4/Fe2P interface coupling ; Li-ion batteries
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 May, 2012
• 卷：206
• 期：Complete
• 页码：259-266
• 文件大小：1801 K

摘要

In this investigation, the synthesis strategy is involved the creation of LiFePO₄-Fe₂P-C composites with a porous conductive architecture, which includes distinct regions or clusters containing antiferromagnetic LiFePO₄ in close proximity to ferromagnetic Fe₂P. The microstructure is achieved by using a simple ultra-fast solvent assisted manual grinding method, combined with solid state reaction, which can replace the time-consuming high energy ball milling method. The crystalline structure, morphology, and electrochemical characterization of the synthesised product are investigated systematically. The electrochemical performance is outstanding, especially the high C rate. The composite cathode is found to display specific capacity of 167 mAh g^鈭? at 0.2 C and 146 mAh g^鈭? at 5 C after 100 cycles, respectively. At the high current density of 1700 mA g^鈭? (10 C rate), it exhibits long-term cycling stability, retaining around 96%(131 mAh g^鈭?) of its original discharge capacity beyond 1000 cycles, which can meet the requirements of a lithium-ion battery for large-scale power applications. The obtained results have demonstrated that the fabrication of samples with strong and extensive antiferromagnetic and ferromagnetic interface coupling of LiFePO₄/Fe₂P provides a versatile strategy toward improving the electrochemical properties of LiFePO₄ materials and also opens up a new window for material scientists to further study the new exchange bias phenomenon and its ability to enhance the electrochemical performance of lithium-ion battery electrode.