Electrochemical Performance Study Of Penolic Resin Carbon Negative Materials

In this paper, penolic resin carbon materials were synthesized simply with phenolic resin used as the precursor. The physical structure and chemical composition of the materials were characterized. Meanwhile, the changes of charge-discharge properties of the penolic resin carbon materials under different heat treatment temperature were studied. It turned out that the reversible specific capacity of the negative materials of the Li-Ion were affected by heat treatment temperature, specific surface area and charge-discharge current density to some degree. With rising of the heat treatment temperature, order of the penolic resin carbon materials were enhanced, and the trend of specific surface area and pore volume first rise and then drop. The PHO800has the biggest specific area, the largest pore volume, and the best electrochemical performance as well. The initial charge/discharge capacity of PHO800is354mAh/g and632mAh/g at a current density of2.5mA/g, which bigger than the capacity of the Lithium ion battery with commercial graphite at the same condition. Meanwhile, the reversible charge/discharge capacity of PHO800can obtain quickly, and the stability of the charge/discharge is fine as well. The reversible charge/discharge capacity of PHO800can still reach328mAh/g when charge/discharge at2.5mA/g for12times.In addition, the cyclic voltammetry curve of PH0800was tested,which shows that the insertion of the Lithium ion recycle mainly occurs at the voltage range of0～1V. Finally, the alternating-current impedance of PHO800and graphite were tested and contrasted. It shows that the interface impedance of PH0800is much lower than the AC impedance of the graphite material as a negative material. The reason is maily attributed to the bigger area and the larger pore volume of PHO800, which can provide more efficient transmition and more active sites for Lithium ions.