Citation: WANG Yao, LI Yan-Cheng, FENG Li-Yuan, ZHAO Qiang, WANG Gui-Xin, LUO Chun-Hui, YAN Kang-Ping. Synthesis of LiFePO₄/C Composites Using Fe₂P₂O₇ as Precursor by a Two-Setp Solid-State Method[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(2): 263-269. doi: 10.11862/CJIC.2018.044 shu

Synthesis of LiFePO₄/C Composites Using Fe₂P₂O₇ as Precursor by a Two-Setp Solid-State Method

1.
College of Chemical Engineering, Sichuan University, Chengdu 610065, China
2.
Material Corrosion and Protection Key Laboratory of Sichuan province, Zigong, Sichuan 643000, China

Corresponding author: ZHAO Qiang, scuzq@scu.edu.cn
Received Date: 22 August 2017
Revised Date: 14 November 2017

Figures(5)

Fe₂P₂O₇ was prepared from Fe-P waste slag and CO₂ using a solid-state method, and it was furtherly used as precursor of LiFePO₄. The compositions and microstructures of the as-synthesized Fe₂P₂O₇ and LiFePO₄ were characterized by TG/DSC, XRD and SEM. It is found that Fe_1.5P can be oxidized to Fe₂P₂O₇ over 700℃ in CO₂ atmosphere. The optimized synthesis of Fe₂P₂O₇ is described as:mixture of Fe_1.5P and H₃PO₄ (extra P source) is calcined at 800℃ for 6 h, which gives the highest specific capacity of LiFePO₄. The discharge capacity of the as-synthesized LiFePO₄ can reach as high as 130, 126, 117, and 108 mAh·g^-1 with C-rates of 0.1C, 0.2C, 0.5C and 1C, respectively.
- Fe₂P₂O₇,
- Fe-P slag,
- CO₂,
- LiFePO₄/C,
- Li-ion battery
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沈阳化工大学材料科学与工程学院沈阳 110142

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Synthesis of LiFePO₄/C Composites Using Fe₂P₂O₇ as Precursor by a Two-Setp Solid-State Method