摘要
为提高锡基化合物CuSn(OH)_(6)的电化学性能,采用水热法制备后,将其与碳纳米管(CNT)复合制备出CuSn(OH)_(6)/CNT纳米复合材料,利用X射线衍射仪、扫描电子显微镜、拉曼光谱仪等仪器对该材料进行表征,并通过恒电流充放电测试、循环伏安测试和电化学阻抗测试考察了用作负极材料的电化学性能。结果表明:制得CuSn(OH)_(6)/CNT纳米复合材料的纯度较高、形貌均匀,用作锂离子电池的负极材料时,在100 mA/g电流密度下,电池的首次放电比容量达到1764.8(mA·h)/g,多次循环后放电比容量稳定在320(mA·h)/g,且倍率性能优于CuSn(OH)_(6),经1 C的大电流充放电后,放电容量可恢复到340.2(mA·h)/g;该复合材料优异的电化学性能归因于锂离子在复合材料结构中传输速率更快、材料导电性能提高以及充放电过程中体积膨胀的抑制。
In order to improve the electrochemical performance of tin based compound CuSn(OH)_(6),CuSn(OH)_(6)/CNT nanocomposites were prepared by hydrothermal method and combined with carbon nanotubes(CNT).The nanocomposites were characterized by X-ray diffractometer,scanning electron microscope,Raman spectrometer and other instruments.The electrochemical performance as negative electrode material was investigated by constant current charge and discharge test,cyclic voltammetry test and electrochemical impedance test.The results showed that the CuSn(OH)_(6)/CNT nanocomposites had high purity and uniform morphology.At a current density of 100 mA/g,the initial discharge specific capacity of the battery reached 1764.8(mA·h)/g as negative electrode material of lithium ion battery.The discharge specific capacity remained stable at 320(mA·h)/g after multiple cycles,and the rate performance of composite was better than CuSn(OH)_(6).The discharge capacity could be restored to 340.2(mA·h)/g after high current charging and discharging at 1 C.The excellent electrochemical performance of composites was due to the faster transmission rate of lithium ions in the composite structure,enhanced material conductivity,and suppression of volume expansion during charge and discharge processes.
作者
赵红晓
朱传旭
付超
李梦南
ZHAO Hong-xiao;ZHU Chuan-xu;FU Chao;LI Meng-nan(Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province,College of Chemical and Materials Engineering,Xuchang University,Xuchang 461000,China)
出处
《石化技术与应用》
2025年第3期175-179,共5页
Petrochemical Technology & Application
