氮掺杂碳磷锂离子电池复合负极材料的制备及电化学性能

Study on Electrochemical Performances of N-doped P/C Composite as Anode Material of Lithium Ion Batteries

以商业化的活性碳作为碳基体,三聚氰胺作为氮源,采用沉积法合成了N掺杂的碳磷复合材料.材料的物性表征和电化学测试结果表明,磷纳米球形颗粒均匀分散在氮掺杂的活性碳上,有效增加了与电解液的接触面积,同时P—C键的存在能稳定材料的结构,当三聚氰胺的添加量为10%(质量分数)时,氮掺杂的碳磷复合材料在室温及0. 1C倍率首次充电比容量为2282. 2m A·h·g^-1,循环100次后充电比容量保持率为92. 5%,在5C倍率下首次充电比容量达到624. 6 mA·h·g^-1.该复合材料在-10℃,0.1C倍率下充电比容量为1128. 2 mA·h·g^-1,在55℃,0. 1C倍率下首次充电比容量达到2060. 5 mA·h·g^-1,表现出较好的电化学性能.

Using commercial activated carbon as the carbon source and tripolycyanamide as nitrgon source,N doped P/C anode materials were directly synthesized by the deposition method.The results show that nano red phosphorus uniformly distributes in pores of conductive carbon substrate when the amount of tripolycyannmide is 10%(mass fraction),which effectively increases the contact area with electrolyte.Typically,benefiting from that P—C bond could endow anode material with cycling and structure stability.The charge capacity of the CPN2 material is 2282.2 mA·h·g^-1 at 0.1C and 25℃,and the reversible capacity is 92.5%after 100 cycles.At a rate of 0.1C,the specific capacity of CPN2 reaches 1128.2 mA·h·g^-1 at-10℃ and 2060.5 mA·h·g^-1 at 55℃,respectively.