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Enhancing the rate performance of spherical LiFeBO3/C via Cr doping

机译:通过Cr掺杂增强球形LiFeBO 3 / C 的速率性能

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Spherical LiFe1?xCrxBO3/C (x = 0, 0.005, 0.008) has been successfully synthesized by ball-milling and spray-drying assisted high-temperature solid-state reaction. The effect of Cr doping on LiFeBO3/C is characterized by XRD, energy-dispersive X-ray spectroscopy (EDS) and XPS. The results show that LiFe0.995Cr0.005BO3/C delivers the highest initial discharge specific capacity of 196.3 mA h g?1 at 0.1C and superior rate capability of 90 mA h g?1 at 5C. Moreover the material presents a cyclic retention of 95% after 50 cycles at 1C. Such improvement in the electrochemical performance can be attributed to the high electronic conductivities (4.75 × 10?5 S cm?1) and Li ion diffusion coefficients (9.20 × 10?13 cm2 s?1). The introduction of supervalent Cr3+ into the LiFeBO3 lattice produces Fe vacancies with accompanying conduction electrons, which lead to the enhanced electronic conductivity and Li ion diffusion coefficient.
机译:球形LiFe 1? x Cr x BO通过球磨和喷雾干燥辅助高温固体成功地合成了 3 / C( x = 0,0.005,0.008)态反应。 XRD,能量色散X射线能谱(EDS)和XPS表征了Cr掺杂对LiFeBO 3 / C的影响。结果表明LiFe 0.995 Cr 0.005 BO 3 / C在0.1C时可提供196.3 mA hg ?1 的最高初始放电比容量和90 mA hg ?1的出色倍率能力 在5C。此外,该材料在1C下经过50次循环后呈现95%的循环保留率。电化学性能的这种提高可归因于高电导率(4.75×10 ?5 S cm ?1 ?13 cm 2 s ?1 )。在LiFeBO 3 晶格中引入超价Cr 3 + 会产生Fe空位以及伴随的导电电子,从而导致增强了电子电导率和锂离子扩散系数。

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