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Temperature-driven structural evolution of carbon modified LiFePO4 in air

机译:空气中碳改性的LiFePO4的温度驱动结构演化

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Lithium iron phosphate (LiFePO4) is an appealing cathode material for lithium ion batteries. However, the degradation of LiFePO4 in air presents an unavoidable challenge, due to the vulnerability of divalent Fe against oxygen attack. In this work, we have carried out comprehensive research on the thermal stability and temperature-driven evolution of nanocarbon modified LiFePO4 in air. The results show that LiFePO4 retains structural stability up to 250 degrees C for short periods of exposure to air. At long exposure times, structural evolution occurs at a much lower temperature, 150 degrees C. The structural evolution proceeds as the temperature increases, and finishes at 400 degrees C. The final products are monoclinic Li3Fe2(PO4)(3) and alpha-Fe2O3. A quantitative evolution map has been developed through electrochemical cyclic voltammetry and galvanostatic tests. The results show that the largest changes take place between 200 and 250 degrees C.
机译:磷酸铁锂(LiFePO4)是一种有吸引力的锂离子电池正极材料。然而,由于二价铁抵抗氧气侵蚀的脆弱性,空气中LiFePO4的降解提出了不可避免的挑战。在这项工作中,我们对空气中纳米碳改性的LiFePO4的热稳定性和温度驱动的演化进行了综合研究。结果表明,LiFePO4可以在短时间暴露于空气中保持250摄氏度以下的结构稳定性。在较长的暴露时间下,结构演化在更低的温度(150摄氏度)下发生。结构演化随着温度的升高而进行,并在400摄氏度下完成。最终产品为单斜晶Li3Fe2(PO4)(3)和α-Fe2O3 。通过电化学循环伏安法和恒电流测试已建立了定量演化图。结果表明,最大的变化发生在200到250摄氏度之间。

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