A carbon-LiFePO4 nanocomposite as high-performance cathode material for lithium-ion batteries

作者：Ren Jianguo^*; Pu Weihua; He Xiangming; Jiang Changyin; Wan Chunrong

来源：Ionics, 2011, 17(7): 581-586.

DOI：10.1007/s11581-011-0599-2

• Lithium iron phosphate
• Carbon
• Nanocomposite
• Li-ion battery
• Spray drying

A cathode material of an electrically conducting carbon-LiFePO4 nanocomposite is synthesized by wet ball milling and spray drying of precursor powders prior to a solid-state reaction. The structural characterization shows that the composite is composed of LiFePO4 crystals and 4.8 wt.% amorphous carbon. Galvanostatic charge/discharge measurements indicate that the composite exhibits a superior high energy and high cycling stability. This composite delivers a discharge capacity of 159.1 mAh g(-1) at 0.1 C, 150.8 mAh g(-1) at 1 C, and 140.1 mAh g(-1) at 2 C rate. The capacity retention of 99% is achieved after 200 cycles at 2 C. The 18,650 cylindrical batteries are assembled using the composite as cathode materials and demonstrate the capacity of 1,400 mAh and the capacity retention of 97% after 100 cycles at 1 C. These results reveal that the as-prepared LiFePO4-carbon composite is one of the promising cathode materials for high-performance, advanced lithium-ion batteries directed to the hybrid electric vehicle and pure electric vehicle markets.

• 出版日期2011-9
• 单位清华大学