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首页> 外文期刊>RSC Advances >Effects of V2O5 nanowires on the performances of Li2MnSiO4 as a cathode material for lithium-ion batteries
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Effects of V2O5 nanowires on the performances of Li2MnSiO4 as a cathode material for lithium-ion batteries

机译：V2O5纳米线对Li2MnSiO4锂离子电池正极材料性能的影响

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摘要

The effects of vanadium pentoxide on the electrochemical properties of Li2MnSiO4 as a cathode material for lithium-ion batteries were tested by synthesizing a V2O5 nanowire-modified in situ carbon coated Li2MnSiO4 composite (LMS/C/V2O5) and comparing its performances with that of a Li2MnSiO4 composite without V2O5. In LMS/C/V2O5, the V2O5 nanowires, with diameters of around 10-20 nm and lengths up to tens of micrometers, entangled together and formed a 3D conductive network; the Li2MnSiO4 nanoparticles, with sizes around 30 nm, distributed uniformly in the network frame and tended to adhere to the V2O5 nanowires. In this structure, the LMS/C/V2O5 composite showed a superior performance as a cathode of lithium-ion batteries even with very low carbon content (3.4 wt%). Ex situ X-ray diffraction patterns, electrochemical impedance spectroscopies of the electrodes and the concentration of Mn ions in the electrolyte during the charge-discharge processes explained the effects of the V2O5 nanowires as an additive in the Li2MnSiO4 cathode material. The benefits of the nanowires include maintaining the crystal structure of Li2MnSiO4 during the charge-discharge cyclings, reducing the charge-transfer resistances at the solid-electrolyte interfaces, increasing the lithium ions diffusion coefficient in the cathode and alleviating the dissolution of manganese into the electrolyte of the batteries.
机译：通过合成V2O5纳米线修饰的原位碳包覆的Li2MnSiO4复合材料（LMS / C / V2O5）并比较其性能，测试了五氧化二钒对作为锂离子电池正极材料的Li2MnSiO4电化学性能的影响。没有V2O5的Li2MnSiO4复合材料。在LMS / C / V2O5中，直径约10-20 nm，长度达数十微米的V2O5纳米线缠结在一起，形成3D导电网络。 Li2MnSiO4纳米颗粒尺寸约30 nm，均匀分布在网络框架中，并倾向于粘附到V2O5纳米线上。在这种结构中，即使具有非常低的碳含量（3.4 wt％），LMS / C / V2O5复合材料也表现出出色的锂离子电池正极性能。异位X射线衍射图，电极的电化学阻抗谱以及充放电过程中电解质中Mn离子的浓度解释了V2O5纳米线作为Li2MnSiO4阴极材料中添加剂的影响。纳米线的好处包括在充放电循环中保持Li2MnSiO4的晶体结构，降低固体-电解质界面的电荷转移电阻，增加锂离子在阴极中的扩散系数以及减轻锰在电解质中的溶解的电池。

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