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为了探究高性能的锂电池负极新型碳基材料,通过高温退火碳包铜纳米颗粒材料制备得到空心碳纳米球,该材料的平均粒径为20 nm,这比其他空心碳球的平均粒径都要小,碳层厚度为1~3 nm,喇曼强度比值为1.06,比表面积为300 m~2·g~(-1)。空心碳纳米球作为锂电池负极材料表现出出众的电化学性能,在186 mA·g~(-1)的电流密度下比容量达到400 mA·h·g~(-1),在不同的电流密度下具有良好的比容量,循环100次的容量保持率为100%,这些优异的电化学性能与空心碳纳米球的高比表面积、空心结构和非常小的粒径有关,这些结果表明空心碳纳米球是一种具有潜力的锂电池负极材料。
In order to explore a new type of carbon-based negative electrode material for high-performance lithium batteries, hollow carbon nanospheres were prepared by high-temperature annealing of carbon-coated carbon nanoparticles with an average particle size of 20 nm, which is more than that of other hollow carbon nanofibers The carbon layer thickness is 1 ~ 3 nm, the Raman intensity ratio is 1.06, and the specific surface area is 300 m ~ 2 · g ~ (-1). Hollow carbon nanospheres show excellent electrochemical performance as the negative electrode material of lithium battery. The specific capacity of the hollow carbon nanospheres reaches 400 mA · h · g -1 at a current density of 186 mA · g -1. Under different current Density, good specific capacity and 100 times of capacity retention of 100%. These excellent electrochemical properties are related to the high specific surface area, hollow structure and very small particle size of hollow carbon nanospheres. These results show that hollow carbon Nanosphere is a potential lithium battery anode material.