聚苯胺改性磷酸钒钠正极材料的制备和电化学性能研究

Preparation and Electrochemical Properties of Polyaniline Modified Sodium Vanadium Phosphate Cathode Material

以无烟煤为碳源、聚苯胺为氮源,通过传统固相法,成功合成了N掺杂C包覆的NVP复合材料(记为NVP/C-PANI),并对复合材料的电化学性能进行了研究。结果表明,聚苯胺的引入并没有改变磷酸钒钠的晶体结构,但由于N元素掺杂进入了碳包覆层,进一步改善了NVP/C-PANI的电子导电性,提升了材料的电化学性能。NVP/C-PANI在1 C时的首次充电比容量高达115.8 mAh·g-1,循环50次后,充电比容量仍有100.8 mAh·g-1,容量保持率高达95.7%。

NVP composites coated with N-doped C(NVP/C-PANI)were successfully synthesized using anthracite as carbon source and polyaniline as nitrogen source by traditional solid-state method,and the electrochemical properties of the composites were studied.The results showed that the introduction of polyaniline did not change the crystal structure of sodium vanadium phosphate,but the electronic conductivity of NVP/C-PANI was further improved and the electrochemical properties of the material were improved due to the doping of N into the carbon coating.The first charge specific capacity of NVP/C-PANI at 1C is 115.8 mAhg^-1.After 50 cycles,the charge specific capacity is still 100.8 mAhg^-1,and the capacity retention rate is as high as 95.7%.