Carbon-Coated, Bismuth-Substituted, Lithium Iron Phosphate as Cathode Material for Lithium Secondary Batteries

Xiang Yin Mo; Xiao San Feng; Yi Ding; Cai Rong Kang

doi:10.4028/www.scientific.net/AMR.739.21

Paper Titles

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Reconstruction of the Growth History of a Large Synthesized Diamond Crystal by Synchrotron Topography
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Reduction Nitridation Synthesis of Bauxite Based β-SiAlON by Aluminum / Silicon Compound
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Experimental Study on Unsupported Nano-MoS₂ Catalyst for Deep Desulfurization Fuel Oil
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Carbon-Coated, Bismuth-Substituted, Lithium Iron Phosphate as Cathode Material for Lithium Secondary Batteries
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Study on a Novel Structure of Zn Phenanthroline Malic Acid Hydrate, [Zn (C₁₂H₈N₂)(C₄H₄O₅)(H₂O)](H₂O)
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Study on a Structure of 2,6-pyridine-dicarboxylic Acid Cobalt Calcium Hexahydrate
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Study on a Structure of Manganese Oxide, Mn₃O₆(H₂O)₂
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Study on the Crystallinity and Mechanical Properties of PC/PLA/LLDPE/ Montmorillonite Blends
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 739Carbon-Coated, Bismuth-Substituted, Lithium Iron...

Carbon-Coated, Bismuth-Substituted, Lithium Iron Phosphate as Cathode Material for Lithium Secondary Batteries

Abstract:

Carbon-coated, bismuth-doped, lithium iron phosphates, LiFe_1xBi_xPO₄ (0x0.05), have been synthesized by a solid-state reaction method. From the optimization, the carbon-coated LiFe_0.95Bi_0.05PO₄ phase showed superior performances in terms of phase purity and high discharge capacity. The structural, morphological, and electrochemical properties were studied and compared to carbon-coated, LiFePO₄. The Li/LiFe_0.95Bi_0.05PO₄ with carbon coating cell delivered an initial discharge capacity of 145 mAh/g and was 30 mAh/g higher than the Li/LiFePO₄ with carbon coating cell. Cyclic voltammetry revealed excellent reversibility of the LiFe_0.95Bi_0.05PO₄ with carbon coating material. High rate capability studies were also performed and showed a capacity retention over 93% during the cycling. It was concluded that substituted Bi ion play an important role in enhancing battery performance of the LiFePO₄ material through improving the kinetics of the lithium insertion/extraction reaction on the electrode.