Wang Jun, Li Shengli, Zhao Yi, Shi Juan, Lv Lili, Wang Huazhi, Zhang Zhiya, Feng Wangjun
School of Physical Science and Technology, Lanzhou University Lanzhou 730000 China
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences Lanzhou 730000 China.
RSC Adv. 2018 Feb 12;8(12):6660-6666. doi: 10.1039/c7ra12027c. eCollection 2018 Feb 6.
With a high specific capacity (4200 mA h g), silicon based materials have become the most promising anode materials in lithium-ions batteries. However, the large volume expansion makes the capacity reduce rapidly. In this work, a periodic silicon/carbon (Si/C) multilayer thin film was synthesized by magnetron sputtering method on copper foil. The titanium (Ti) film (about 20 nm) as the transition layer was deposited on the copper foil prior to the deposition of the multilayer film. Superior electrochemical lithium storage performance was obtained by the multilayer thin film. The initial discharge and charge specific capacity of the Si (15 nm)/C (5 nm) multilayer film anode are 2640 mA h g and 2560 mA h g with an initial coulombic efficiency of ∼97%. The retention specific capacity is about 2300 mA h g and there is ∼87% capacity retention after 200 cycles.
硅基材料具有高比容量（4200 mA h g），已成为锂离子电池中最具前景的负极材料。然而，其巨大的体积膨胀会使容量迅速降低。在本工作中，通过磁控溅射法在铜箔上合成了周期性硅/碳（Si/C）多层薄膜。在沉积多层膜之前，先在铜箔上沉积了约20 nm厚的钛（Ti）膜作为过渡层。该多层薄膜展现出优异的电化学锂存储性能。Si（15 nm）/C（5 nm）多层膜负极的首次放电和充电比容量分别为2640 mA h g和2560 mA h g，初始库仑效率约为97%。其比容量保持率约为2300 mA h g，在200次循环后容量保持率约为87%。
