硅与氮化钛纳米复合材料作为锂离子电池负极的吸放锂性能研究  

Study on Lithiation/Delithiation Properties of Si-TiN Composited Nanoparticles as Anode Materials for Lithium-Ion Batteries

作　　者：王忠[1] 田文怀[1] 李星国[2] 

机构地区：[1]北京科技大学材料物理与化学系,北京100083 [2]北京大学稀土材料化学与应用国家重点实验室,北京100871

出　　处：《稀有金属材料与工程》2007年第10期1874-1877,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50274002;20221101及10335040)

摘　　要：采用直流电弧等离子体方法合成了硅与氮化钛纳米复合材料,利用XRD,TEM等手段研究了其微观结构。结果显示,得到的纳米颗粒由Si和TiN以及部分Cu0.1Si1.9Ti组成,其形状为球形,颗粒尺寸大多分布在10～50nm之间。用恒流充放电的方法研究了其作为锂离子电池负极的电化学行为,在锂的嵌入硅镍纳米颗粒的过程中,Si充当活性中心,而其中的TiN和Cu0.1Si1.9Ti作为惰性成分,不与Li反应,充当缓冲基体及导电剂的作用。当电流密度为150mA·g-1时,电极的循环稳定性最好,首次可逆容量为737mAh·g-1,20次循环后容量仍为542mAh·g-1。在0.05～0.8V的电位区间的循环稳定性是最好的。Si-TiN composited nanoparticles were prepared by hydrogen plasma reaction. The morphology and crystal structure of the nanoparticles were investigated by TEM and XRD. The nanoparticles consists of Si and TiN as well as partial Cu0.1Si1.9Ti. During lithium insertion into the alloy electrodes, Si acts as active centre, while the TiN and Cu0.1Si1.9Ti in the material plays the role of matrix as an inertia phase, which can buffer silicon volume expansion and raise electric conductivity among silicon particles. A high lithium storage capacity of 737 mAh·g^-1 was observed for the composite nanoparticles, and specific capacity is 542 mAh·g^-1 at the 20th cycle. The cycle stability of the potential in the range of 0.05-0.80 V shows the best.

关 键 词：纳米材料 硅合金 锂离子电池 负极材料 

分 类 号：TM910.4[电气工程—电力电子与电力传动]