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首页> 外文期刊>International Journal of Electrochemical Science >Synthesis and Characterization of Pitch-Coated Li2MnxFe1-xSiO4/C Composite Cathode Material for Lithium- Ion Batteries
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Synthesis and Characterization of Pitch-Coated Li2MnxFe1-xSiO4/C Composite Cathode Material for Lithium- Ion Batteries

机译：沥青包覆Li 2 Mn x Fe 1-x SiO 4 / C复合阴极材料的合成与表征锂离子电池

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In this study, two cathode materials were synthesized (Li2Mn0.5Fe0.5SiO4 and Li2Mn0.2Fe0.8SiO4). The intrinsic characteristics and electrochemical performance of these materials were investigated. These silicate cathode materials have several advantages such as high safety, low cost, low environmental toxicity, and high theoretical energy density. However, they have some drawbacks that must be addressed, including low electronic conductivity and low ionic diffusivity, which limit their practical application in lithium-ion batteries. The Li2MnxFe1?xSiO4/C composite materials were prepared using the sol–gel method. The X-ray diffraction patterns of the synthesized Li2MnxFe1-xSiO4/C composite materials exhibited favorable crystallinity. Pitch was coated on the synthesized composite materials to improve their electronic conductivity. Raman spectroscopy confirmed the high graphitization of the carbon coatings. The discharge capacity of the pitch-coated Li2Mn0.2Fe0.8SiO4/C ?1 (Li2Mn0.2Fe0.8SiO4/C/pitch) cathode was 183 mAh g delivered in the first cycle at a rate of 0.1 C. The battery cycle retention was 85% after 30 cycles, demonstrating an excellent cycle life compared with those reported in previous studies. These cathode materials have high potential for application in lithium-ion batteries.
机译：在这项研究中，合成了两种正极材料（Li2Mn0.5Fe0.5SiO4和Li2Mn0.2Fe0.8SiO4）。研究了这些材料的固有特性和电化学性能。这些硅酸盐阴极材料具有几个优点，例如高安全性，低成本，低环境毒性和高理论能量密度。然而，它们具有必须解决的一些缺点，包括低电子电导率和低离子扩散率，这限制了它们在锂离子电池中的实际应用。 Li2MnxFe1？xSiO4 / C复合材料是采用溶胶-凝胶法制备的。合成的Li 2 Mn x Fe 1-x SiO 4 / C复合材料的X射线衍射图显示出良好的结晶度。将沥青涂覆在合成的复合材料上以改善其电子导电性。拉曼光谱证实了碳涂层的高度石墨化。沥青涂覆的Li2Mn0.2Fe0.8SiO4 / Cα1（Li2Mn0.2Fe0.8SiO4 / C / pitch）阴极的放电容量为183 mAh g，在第一循环中以0.1 C的速率输送。电池循环保持率为30次循环后达到85％，与以前的研究相比，具有出色的循环寿命。这些阴极材料具有用于锂离子电池的高潜力。

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