GO-PTAm:一种高性能锂离子电池正极材料

GO-PTAm: high-performance cathode material for lithium-ion batteries

摘要:

通过原子转移自由基聚合法（ATRP法）制备了聚（4-丙烯酰胺基-2,2,6,6-四甲基哌啶-1-氧基）-氧化石墨烯（PTAm-GO）复合材料。采用红外、拉曼、X射线衍射、热重、电子顺磁共振等手段对复合材料进行了表征，将活性材料作为正极组装成扣式电池，测量扣式电池的循环伏安图、电化学阻抗谱和充放电循环容量。结果表明，PTAm-GO电极可以发生可逆的氧化还原反应，且具有比PTAm更低的电化学阻抗和高出约两倍的充放电容量，经过300次充放电循环后，电极比容量保持在138 mAh/g，容量保持率为96.5 %。这对有机电池的发展，特别是对氮氧化物自由基聚合物电极材料的研究具有重要的参考价值。

Abstract:

Poly(4-acrylamido-2,2,6,6-tetramethylpiperidine-1-oxy)-graphene oxide (PTAm-GO) composite was prepared by atom transfer radical polymerization method material. The composite material was characterized by infrared, Raman, X-ray diffraction, thermogravimetric, electron paramagnetic resonance and other methods, and the active material was used as a positive electrode to be assembled into a button cell to measure its cyclic voltammogram, electrochemical impedance spectrum and Charge and discharge cycle capacity.The results show that the PTAm-GO electrode can undergo a reversible oxidation-reduction reaction, and has a lower electrochemical impedance than PTAm and a charge-discharge capacity about twice higher. After 300 charge-discharge cycles, the electrode specific capacity remains at 138 mAh/g, the capacity retention rate is 96.5%. This has important reference value for the development of organic batteries, especially for the research of oxynitride radical polymer electrode materials.