Citation: HU Guo-Rong, PENG Qing-Yuan, PENG Zhong-Dong, CAO Yan-Bing, DU Ke. Comparison on Properties of Lithium Iron Phosphate/Graphene Composite Prepared by Two Methods[J]. Chinese Journal of Inorganic Chemistry, ;2015, (6): 1153-1158. doi: 10.11862/CJIC.2015.167 shu

Comparison on Properties of Lithium Iron Phosphate/Graphene Composite Prepared by Two Methods

1.
School of Metallurgy and Environment, Central South University, Changsha 410083, China

Received Date: 25 January 2015
Available Online: 28 April 2015
Fund Project: 湖南省自然科学基金(No.2015JJ3152)资助项目。 (No.2015JJ3152)

Using FeSO₄·7H₂O, NH₄H₂PO₄, H₂O₂, Li₂CO₃, C₆H₁₂O₆ and GO as raw materials, LiFePO₄/C/G-2 composite cathode material prepared by mixing FePO₄·2H₂O, Li₂CO₃ and GO and LiFePO₄/C/G-1 by mixing FePO₄·2H₂O/GO and Li₂CO₃ were compared. Crystal structure, morphology and electrochemical performance of the two samples were investigated by X-ray diffraction(XRD), scanning electron microscope(SEM), Transmission Electron Microscope (TEM),electrochemical impedance spectroscopy (EIS) test and charge-discharge test. LiFePO₄/C/G-1 showed better electrochemical performances compared to LiFePO₄/C/G-2. When the chemical synthesis method product (LiFePO₄/C/G-1) was charged-discharged in 2.5~4.1 V, the initial discharge capacity was 158.15 and 150.5 mAh·g^-1 at 0.1Cand 1Crate, respectively. After cycling for 500 times at 1Crate, the retention of discharge capacity was 98.3%.
- composite cathode material;lithium iron phosphate;graphene;electrochemical performance
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沈阳化工大学材料科学与工程学院沈阳 110142