| MoO3 /SiO2复合正极材料的制备及电化学性能研究 |
| Preparation and Electrochemical Properties of MoO3 /SiO2 Composite Cathode Material for Lithium-Ion Batteries |
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| 摘要: 本文通过化学沉淀-热处理方法制备了MoO3正极材料，并通过正硅酸乙酯(TEOS)的水解在MoO3的表面包覆SiO2得到MoO3 /SiO2复合正极材料[wSiO2/wMoO3=8%]，对制备材料的结构和电化学性能进行了表征。结果表明，得到的MoO3为纯的正交相结构，片状MoO3的粒径大小约200~500 nm，厚度约50 nm。片状颗粒倾向于堆积在一起形成层状结构。在MoO3的表面包覆了一层无定形的SiO2。在电压范围1.5~4.0 V的条件下，以0.1C倍率进行恒电流充放电测试，MoO3 /SiO2样品的首次放电容量为332.7 mAh·g-1，库仑效率87.6%。循环20次后，放电容量降为277.7 mAh·g-1。SiO2的包覆降低了MoO3正极材料的初始容量，但循环性能得到了提高。 |
| 关键词: 正极材料 三氧化钼 表面包覆 电化学性能 |
| 基金项目: |
| Abstract: MoO3 material was prepared by chemical precipitation and heat treatment method, and MoO3 /SiO2 composite material was also prepared using MoO3 and Si(OC2H5)4 as the starting materials. The structural and morphological properties of the products were investigated by XRD, FT-IR, SEM and TEM. All the diffraction peaks from the pattern of MoO3 can be readily indexed to the pure phase of α-MoO3 with the orthorhombic structure. No peaks from other phases have been detected from the pattern of MoO3 /SiO2, indicating that SiO2 presents as amorphous material. The initial discharge capacity of MoO3 /SiO2 is 332.7 mAh·g-1 and coulombic efficiency is 87.6%. A discharge capacity of 277.7 mAh·g-1 is still obtained after 20 cycles, indicative of the good reversibility of Li+ intercalation/deintercalation reaction for MoO3 /SiO2 electrode material. SiO2 coating over MoO3 can reduce the direct contact of electrode material with electrolyte and suppress the dissolution reaction of metal ions in electrode material. |
| Keywords: cathode material molybdenum trioxide surface coating electrochemical property |
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| 崔 萍,梁 英,孙永林.MoO3 /SiO2复合正极材料的制备及电化学性能研究[J].无机化学学报,2012,28(9):1861-1866. |
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