Effect of synthesis conditions on the properties of LiFePO4 for secondary lithium batteries |
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| Affiliation: | 1. Department of Inorganic Materials Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea;2. New Materials Evaluation Center, Korea Research Institute of Standard and Science, Taejon 305-600, Republic of Korea;1. Institut de Recherche d''Hydro-Québec (IREQ), 1800 Bd Lionel-Boulet, Varennes, QC J3X 1S1 Canada;2. Department of Mining and Materials Engineering, McGill University, Montreal, QC H3A 2B2 Canada;3. Sorbonne Universités, UPMC Univ Paris 06, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), 4 place Jussieu, F-75005 Paris, France;4. Sorbonne Universités, UPMC Univ Paris 06, Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), 4 place Jussieu, F-75005 Paris, France;1. Guangxi Key Laboratory for Relativistic Astrophysics, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Novel Battery Materials Research Center of Engineering Technology, Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, College of Physical Science and Technology, Guangxi University, Nanning, 530004, PR China;2. Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, PR China |
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| Abstract: | LiFePO4 is one of the promising materials for cathode of secondary lithium batteries due to its high energy density, low cost, environmental friendliness and safety. However, LiFePO4 has very poor electronic conductivity (∼10−9 S cm−1) and Li-ion diffusion coefficient (∼1.8 × 10−14 cm2 s−1) at room temperature. In an attempt to improve electrochemical properties, LiXFePO4 with various amounts of Li contents were investigated in this study. LiXFePO4 (X = 0.7–1.1) samples were synthesized by solid-state reaction. High resolution X-ray diffraction, Rietveld analysis, BET, scanning electron microscopy, and hall effect measurement system were used to characterize these samples. Electronic conductivities of the samples with Li-deficient and Li-excess in LixFePO4 were 10−3 to 10−1 S cm−1. Discharge capacities and rate capabilities of the samples with Li-deficient and Li-excess in LiXFePO4 were higher than those of stoichiometric LiFePO4 sample. Li0.9FePO4 samples fired at 700 °C had discharge capacity of 156 and 140 mAh g−1 at 0.1 C- and 2 C-rate, respectively. |
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