SnO2@C锂离子电池负极材料的制备及其性能研究

Preparation of SnO2@C anode material for lithium-ion battery and study on its properties

采用实心六面体Zn SnO3为前驱体,以酚醛树脂为碳源,经酚醛树脂包覆Zn SnO3纳米立方体,然后碳化并经Na2EDTA处理后获得空心六面体SnO2@C复合材料。采用XRD、SEM、TEM、Raman等表征手段研究SnO2@C样品的化学组成、结构与形貌,并通过电池测试系统对样品进行电化学性能测试。结果表明,该材料具有空心结构,表面均匀地包覆了一层碳,这种在材料表面包覆的碳不仅增加了复合材料的整体导电性,同时又作为保护物质缓解了Sn粒子在充放电过程中的团聚及体积膨胀。因此,以其制备的负极表现出优异的电化学性能。

Solid hexahedral ZnSnO3is used as a precursor,phenolic resin is used as carbon source,solid hexahedral Zn SnO3is coated by phenolic resin and then carbonized together.Hollow hexahedral SnO2@C composites are obtained after the carbonized materials are treated by Na2EDTA.XRD,SEM,TEM,Raman and other characterization methods are utilized to study the chemical composition,structure and morphology of SnO2@C samples.The electrochemical performance of the samples is tested through a battery test system.The results show that the sample has a hollow structure and its surface is uniformly coated with a layer of carbon.The carbon coated on the surface of the material not only increases the overall conductivity of the composite material,but also acts as a protective substance to alleviate the agglomeration and volume expansion of Sn particles during charge and discharge.Therefore,the anode electrode prepared from SnO2@C composites exhibits excellent electrochemical performance.