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Effect of complexing agent on LiFePO4/C cathode carbon content and lithium storage capacity by sol-gel method

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Document pages: 7 pages

Abstract: LiFePO4 with olivine structure faces inherent challenges in the application of lithium-ion batteries due to its poor conductivity and poor lithium ion diffusion ability. Low cost sol-gel method is conducive to the in situ synthesis of carbon coated LiFePO4 (LiFePO4 C), which not only improves the electronic conductivity, but also limits the particle size to the nanoscale. In this study, the key parameters focus on the selection and quantity of chelating agents in the synthetic route. The results show that the stability of the complexes has an important effect on the carbon content and electrochemical properties of the products. Nanocrystalline LiFePO4 C materials with appropriate carbon coating were prepared under appropriate precursor, composition and synthesis conditionsg were successfully obtained. A reversible capacity of 162 mAh g was achieved at 0.2 rate, in addition to good discharge rate capability.

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