作为锂离子电池（LIB）未来的替代品，钾离子电池（PIB）的发展前景广阔。为了研究碳材料制备钾离子电池正极的可行性，采用3种不同的碳材料（活性炭、碳纳米管及氮掺杂碳纳米管）分别进行氧化修饰对比实验，并进行了不同电流密度的电化学测试。测试结果表明，氮掺杂碳纳米管作为钾离子电池正极材料的性能最佳，具有优异的比容量（200 mA·h/g）和循环性能（在1 A/g的电流密度下，150次充放电循环后容量达到初始值的72%）。为碳材料及钾离子电池正极材料的发展提供了一种全新的研究思路。

Potassium-ion battery (PIB) has been identified as a promising alternative to lithium-ion battery (LIB).In order to study the feasibility of preparing PIB cathode from carbon materials,activated carbon,carbon nanotube and nitrogen-doped carbon nanotube are respectively used to perform comparative experiments of oxidation modification and electrochemical measurement under different current densities.Among these three carbon materials,it is found that nitrogen-doped carbon nanotube after oxidation modification exhibits the best electrochemical performance as PIB cathode,with a high specific capacity (200 mA·h·g^-1 at 50 mA·g^-1) and an excellent cycling stability that the capacity remains 72% of the initial value after 150 cycles at 1 A/g.This work explores a new way for developing advanced PIB cathode materials.

杜广裕(1993-),男,硕士生,研究方向为纳米能源材料,dgyhhh@hotmail.com