酰亚胺基锂电池有机聚合物负极材料的制备及电化学性能研究

发布时间：2018-12-07 08:35

【摘要】：设计合成了一系列聚酰亚胺基的共轭骨架材料用于锂电池负极.首先,选用具有不同共轭体系的二酐分子用作共聚物构建单元,随后通过亚胺化反应与三聚氰胺共缩聚.最后,通过进一步热处理提高材料的交联程度和稳定性.将该材料用于锂离子电池负极表现出稳定的电化学性能.聚合物的倍率性能测试结果表明:在150 mA·g~(-1)的电流密度下,循环150次后,放电比容量达到471 mAh·g~(-1)以上,在2 A·g~(-1)的较大电流密度下,放电比容量达122.1 mAh·g~(-1),当电流密度返回至100 mA·g~(-1)时,其放电比容量又上升至532.3 mAh·g~(-1)左右,材料具有较好的倍率性能,聚合物材料在充放电过程中,避免了有机小分子材料在与锂离子结合后,易溶于电解液造成的容量损失.同时,共聚物骨架的共轭结构单元和极性基团,可在保证材料的导电性的同时增加材料结合锂离子的能力,因此表现出了优异的倍率性能.
[Abstract]:A series of conjugated matrix materials based on polyimide were designed and synthesized for the negative electrode of lithium battery. Firstly, dianhydride molecules with different conjugated systems were selected as the building units of the copolymers, and then co-condensed with melamine by imidization reaction. Finally, the crosslinking degree and stability of the material were improved by further heat treatment. The application of this material to the anode of lithium ion battery shows stable electrochemical performance. The experimental results show that at the current density of 150 mA g ~ (-1), the specific discharge capacity of the polymer is over 471 mAh g ~ (-1) after 150 cycles, and the specific discharge capacity is above 471 mAh g ~ (-1) at a high current density of 2 A g ~ (-1). The discharge specific capacity reaches 122.1 mAh g ~ (-1). When the current density returns to 100 mA g ~ (-1), the discharge specific capacity increases to about 532.3 mAh g ~ (-1). In the process of charge and discharge of polymer materials, the loss of capacity caused by lithium-ion binding of organic small molecular materials is avoided. At the same time, the conjugated structure units and polar groups of the copolymer skeleton can guarantee the conductivity of the materials and increase the binding capacity of the materials to lithium ions, thus showing excellent rate performance.
【作者单位】：江南大学纺织服装学院生态纺织教育部重点实验室(江南大学) 江苏奥神新材料股份有限公司
【基金】：国家自然科学基金(基金号51503082) 中央高校基本科研业务费专项资金(基金号JUSRP51505,JUSRP116020)资助
【分类号】：TM912

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