Electrochemical property of Si-O-C composite anode materials prepared by pyrolyzing polysiloxane containing phenyl under different atmospheres

Abstract

Silicon Oxycarbide (Si-O-C) composite anode materials are prepared by pyrolysis of polysiloxane containing phenyl under argon and hydrogen atmospheres, separately. They are characterized by element analysis, wide-angle powder X-ray diffraction, Raman spectroscopy for comparison with each other. It is found that the silicon oxycarbide composite anode pyrolyzed under a hydrogen atmosphere demonstrates lower irreversible capacity and larger reversible capacity which increases with temperature rising. The one pyrolyzed at 1000 ℃ shows a reversible capacity of 622 mAh/g, and first coulombic efficiency of 59%.The magnitude of the irreversible capacity is correlated with the content of oxygen, and the reversible capacity is related to the content and structure of free carbon, and also the structure of Si-O-C. It is believed that Si-O-C composite materials pyrolyzed under a hydrogen atmosphere could be promising anode materials for lithium ion batteries.

Analysis on the capacity degradation mechanism of a series lithium-ion power battery pack based on inconsistency of capacity

“…The curing of cathode active ion and the growth of solid electrolyte interphase (SEI) [1][2][3] are the main factors of the performance degradation of lithium-ion power battery. The degradation of a lithium-ion power battery is related to both the stability of its internal electrochemical system [4][5][6][7][8][9][10] and the working conditions of the power battery pack, in particular, charge rate, discharge rate, and operating temperature. Some scholars have conducted in-depth study and analysis for the effect of temperature on the cycle life or shelf life [11,12] and described the effect by using the Alan Vilnius equation.…”