The influence of the pyrolysis temperature on the electrochemical behavior of carbon-rich SiCN polymer-derived ceramics as anode materials in lithium-ion batteries

作者：Reinold Lukas Mirko; Yamada Yuto; Graczyk Zajac Magdalena^*; Munakata Hirokazu; Kanamura Kiyoshi; Riedel Ralf

来源：Journal of Power Sources, 2015, 282: 409-415.

DOI：10.1016/j.jpowsour.2015.02.074

• Lithium-ion battery
• Single particle measurements
• Silicon carbonitride
• Polymer-derived ceramic

Within this study we report on the impact of the pyrolysis temperature on the structural and electrochemical properties of the poly(phenylvinylsilylcarbodiimide) derived silicon carbonitride (SiCN) ceramic. Materials pyrolysed at 800 degrees C and 1300 degrees C, SiCN 800 and SiCN 1300, are found amorphous. Raman spectroscopy measurements indicate the increase in ordering of the free carbon phase with increasing pyrolysis temperature which leads to lower capacity recovered by SiCN 1300. Significant hysteresis is found for materials pyrolysed at 800 degrees C during electrochemical lithium insertion/extraction. This feature is attributed to much higher hydrogen content in SiCN 800 sample. An aging of SiCN 800 reflected by a change of elemental composition upon contact to air and a strong film formation are attenuated at a higher pyrolysis temperature. Single particle microelectrode investigation on SiCN 800 and SiCN 1300 clarify different electrochemical behavior of the materials. Much lower charge transfer resistance of SiCN 1300 in comparison to SiCN 800 explains better high currents electrochemical performance. Lithium ions diffusion coefficient Dmin ranges from 3.2 10-9 cm(2)s(-1) to 6.4 10-11 cm(2)s(-1) and is independent on the potential.

• 出版日期2015-5-15