A Co3O4/C Composite for use as a High-Performance Lithium-Ion Battery Anode

摘要

Due to advantages such as low environmental impact,low price,and high theoretical specific capacity,Co3O4 has been widely studied.However,its low conductivity and volume expansion during the charging and discharging processes caused pulverization and agglomeration ultimately leads to a rapid decline in battery capacity during the cycle.The creation of nano structured composite of carbon materials and Co3O4 can be used to form a highly conductive matrix that improves the electronic conductivity,and improves the dispersion of Co3O4 to reduce agglomeration and volume expansion.In this work,the rigid conjugated plane structure of 1,10-phenanthroline was selected to coordinated with cobalt nitrate to form a precursor complex.After heating,the crystal core of Co3O4 becomes more uniform in size with a more regular geometry.Additionally,a calcining temperature of 350℃ was shown to result in an optimal amount of carbon residue that improved electronic conductivity of the whole composite while not excessively hindering lithium-ion transport.As a result,these properties improved the electron conductivity and protect the crystals from damage caused by volume change during charge and discharge to a certain extent,thus contributing to improved electrochemical performance.