Preparation and Characterization of High-Density Li_0.99W_0.01FePO₄/C Composite Cathodes

Abstract:

High tap-density Li_0.99W_0.01FePO₄/C composite have been synthesized via a simple and low-cost solid state-carbothermal reduction method, using Fe₂O₃ and citrate ferric as the Fe³⁺ precursors and citric radical containing in citrate ferric as both carbon source and reducing agent. The structure, morphology, and physicochemical properties of Li_0.99W_0.01FePO₄/C composite were characterized by XRD, SEM, laser diffraction and scattering measurement, and tap-density testing. It is observed the particle distribution of the Li_0.99W_0.01FePO₄/C composite is bimodal distribution. Because of the smaller particles filling in the space between the larger particles, the Li_0.99W_0.01FePO₄/C composite exhibits less vacancy, which resulted in a high tap density of 1.50 g•cm^-3. The Li_0.99W_0.01FePO₄/C composite also shows good rate capability and cycle performance. At current densities of 0.2, 0.5, 1.0 and 1.5 C, the composite material has initial discharge specific capacity of 141, 133, 130 and 125 mAh•g^-1, respectively.

• Periodical: Advanced Materials Research (Volumes 554-556)
• Pages: 399-403
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.554-556.399
• Online since: July 2012
• Authors: Mei E Zhong
• Keywords: Carbothermal Reduction Method, High-Density, Li_0.99W_0.01FePO₄/C, Lithium-Ion Battery

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