物理化学学报Issue(6)：1247-1252,6.DOI:10.3866/PKU.WHXB201303211
Li4Ti5O12/CMK-3复合材料的制备及其作为锂离子电池负极材料的性能
Synthesis and Electrochemical Performance of Li4Ti5O12/CMK-3 Nanocomposite Negative Electrode Materials for Lithium-Ion Batteries
摘要
Abstract
The composite of ordered mesoporous carbon (CMK-3) and Li4Ti5O12 (Li4Ti5O12/CMK-3) was prepared by the wet impregnation of CMK-3 with LiNO3 and Ti(OC4H9)4 solution fol owed by calcination. Its morphology and structure were examined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The content of Li4Ti5O12 in the mesoporous nanocomposite was determined by thermogravimetric analysis. Its electrochemical performance as the negative electrode material of lithium-ion batteries was investigated by galvanostatic charge-discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results show that Li4Ti5O12 is formed inside the mesopore channels of CMK-3 and some particles are located on the surface of CMK-3. The composite shows significantly greater high-rate performance than commercial Li4Ti5O12. The specific capacity of Li4Ti5O12 in the composite is higher than Li4Ti5O12 without CMK-3 (117.8 mAh·g-1 at 1C rate), and its stabilized specific capacity reached 160, 143, and 131 mAh·g-1 at 0.5C, 1C, and 5C charge-discharge rates, respectively, with a columbic efficiency of nearly 100%. The capacity loss after 100 cycles at 5C rate was less than 0.62% . This result clearly indicates that CMK-3 improves the high rate performance of Li4Ti5O12, likely by reducing the particle size of Li4Ti5O12 and increasing its electronic conductivity owing to the unique structure and good electronic conduction nature of CMK-3.关键词
有序介孔碳/Li4Ti5O12/复合材料/锂离子电池/负极材料Key words
Ordered mesoporous carbon/Lithium titanate oxide/Composite/Lithium-ion battery/Negative electrode material分类
化学化工引用本文复制引用
武洪彬,佘佩亮,张莹,袁聪俐,韦小培,殷金玲,王贵领,曹殿学,张益明,杨宝峰..Li4Ti5O12/CMK-3复合材料的制备及其作为锂离子电池负极材料的性能[J].物理化学学报,2013,(6):1247-1252,6.基金项目
哈尔滨优秀学术带头人科技创新基金(2012RFXXG103),中央高校基础研究基金(HEUCFT1205)及江苏省科技支撑计划(BE2012152)资助 （2012RFXXG103）
