空心碳半球锂离子电池负极的高倍率性能研究

High-Rate Cyclic Properties of Hollow Carbon Hemisphere as Anode Materials for Lithium Ion Batteries

以聚苯乙烯球为模板,通过水热法包裹硬碳层,又用微波法迅速引发聚苯乙烯核裂解的两步反应,制备了高比表面的空心碳半球.采用扫描电镜和透射电镜观察材料形貌,并测试该负极的电化学性能.在高倍率充放电条件下,与石墨、中间相碳微球电极相比,空心碳半球显现出了更高的容量和优异的寿命.

High surface area hollow carbon hemispheres （ HCHs） covered with hard carbon layers have been synthesized by using polystyrene spheres （ PSs） as templates under hydrothermal method combined with the intermittent microwave heating （ IMH） method. The morphologies of the materials are characterized by SEM and TEM. The electrochemical properties of the HCHs are tested. Comparing with graphite and mesocarbon microbeads （ MCMB） ,the HCHs show higher capacity and excellent cyclic life performance.