磁控溅射法制备铝薄膜锂离子电池负极材料

Preparation of Aluminum Film via Magnetron Sputtering as Li-ion Battery Anodes

通过磁控溅射技术使用高纯铝靶材在铜箔上沉积制备了铝薄膜,并通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)对其组成和结构进行了表征,然后作为锂离子电池负极材料对其电化学性能进行了测试。结果表明,铝薄膜由晶体的纳米颗粒组成,并且均匀地覆盖在铜箔表面。作为锂离子电池负极材料在电流密度为2200 mA/g时表现出2184 mAh/g的初始放电比容量,充放电10次后,可以维持80%的初始比容量。容量的衰减是由于在锂离子嵌入和脱出过程中,铝薄膜会发生大的体积膨胀和收缩,导致铝负极发生破裂粉化及结构崩塌。可以利用磁控溅射技术对铝薄膜厚度和结构进行调控,从而进一步提高锂离子电池铝薄膜负极的循环稳定性。

Aluminum film coated on copper foil was prepared via magnetron sputtering strategy.The samples were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM)with energy dispersive spectrometry(EDS).It is found that aluminum film composed of nanoparticles is crystal structure.As lithium-ion battery anode,aluminum film shows a discharge capacity of 2184 mAh/g at the current density of 2200 mA/g.After 10 charge-discharge cycles,it maintains 80%initial capacity.The capacity fading is due to large volume change of aluminum during lithium ion insertion and extraction reactions,and the cracking of the electrode.The thickness and structure of aluminum film can be controlled via magnetron sputtering technology to further improve the cycling stability of aluminum film as lithium-ion battery anode.