National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401, USA.
Nanotechnology. 2013 Oct 25;24(42):424002. doi: 10.1088/0957-4484/24/42/424002. Epub 2013 Sep 25.
Atomic layer deposition (ALD) was used to deposit TiO2 anode material on high surface area graphene (reduced graphene oxide) sheets for Li-ion batteries. An Al2O3 ALD ultrathin layer was used as an adhesion layer for conformal deposition of the TiO2 ALD films at 120 ° C onto the conducting graphene sheets. The TiO2 ALD films on the Al2O3 ALD adhesion layer were nearly amorphous and conformal to the graphene sheets. These nanoscale TiO2 coatings minimized the effect of the low diffusion coefficient of lithium ions in bulk TiO2. The TiO2 ALD films exhibited stable capacities of ~120 mAh g(-1) and ~100 mAh g(-1) at high cycling rates of 1 A g(-1) and 2 A g(-1), respectively. The TiO2 ALD films also displayed excellent cycling stability with ~95% of the initial capacity remaining after 500 cycles. These results illustrate that ALD can provide a useful method to deposit electrode materials on high surface area substrates for Li-ion batteries.
原子层沉积（ALD）被用于在高比表面积石墨烯（还原氧化石墨烯）片上沉积 TiO2 阳极材料，用于锂离子电池。使用 Al2O3 ALD 超薄层作为粘附层，以在 120°C 下将 TiO2 ALD 薄膜共形地沉积到导电石墨烯片上。在 Al2O3 ALD 粘附层上的 TiO2 ALD 薄膜几乎是无定形的，并与石墨烯片共形。这些纳米级 TiO2 涂层最大限度地减少了体相 TiO2 中锂离子低扩散系数的影响。TiO2 ALD 薄膜在高循环速率 1 A g(-1) 和 2 A g(-1) 下分别表现出稳定的容量约为 120 mAh g(-1) 和 100 mAh g(-1)。TiO2 ALD 薄膜还表现出优异的循环稳定性，在 500 次循环后仍保持初始容量的约 95%。这些结果表明，ALD 可以为锂离子电池的高比表面积衬底上沉积电极材料提供一种有用的方法。
