SnSbCo/rGO anodes of high capacity sodium ion batteries
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摘要: 采用共沉淀法、液氮冷淬工艺和热处理技术制备了高容量钠离子电池SnSbCo/rGO负极复合材料。通过XRD、SEM、TEM、恒流充放电和交流阻抗等测试分析技术对该负极材料进行表征和电化学性能测试。结果表明，在100 mA/g的电流密度下，经50次充放电循环后电极的可逆容量保持在567 mAh/g。同等条件下，纯SnSbCo的电极比容量为456mAh/g。SnSbCo/rGO负极复合材料的电化学性能的改善主要是由于rGO在提高复合材料导电性的同时，缓冲了SnSbCo合金颗粒由于团聚产生的体积膨胀效应。Abstract: The SnSbCo/reduced graphene oxide (rGO) hybrids were fabricated via co-precipitation, followed by the special process of liquid nitrogen quenching and the subsequent thermal treatments. The crystal structure, morphology and electrochemical properties of the SnSbCo/reduced graphene oxide hybrids were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), galvanostatical cycling tests and EIS analysis. When the SnSbCo/reduced graphene oxide hybrids were applied as anodes for rechargeable sodium ion battery, the electrodes deliver a reversible capacity of 567 mAh g-1 at 100 mA g-1 after 50 cycles, compared with 456 mAh g-1 for bare SnSbCo. The well-improved electrochemical performance of the SnSbCo/reduced graphene oxide can be attributed to the conducting network of graphene, which greatly improves the conductivity of the electrode with volume buffering effect to prevent SnSbCo particles from aggregating.
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Keywords:
- sodium ion battery /
- SnSbCo /
- rGO /
- anode /
- high performance
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