MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University , 38 Zheda Road, Hangzhou 310027, P. R. China.
ACS Appl Mater Interfaces. 2017 Jul 12;9(27):22628-22634. doi: 10.1021/acsami.7b07024. Epub 2017 Jun 28.
Aluminum metal foil is the optimal choice as an anode material for aluminum-ion batteries for its key advantages such as high theoretical capacity, safety, and low cost. However, the metallic nature of aluminum foil is very likely to induce severe dendrite growth with further electrode disintegration and cell failure, which is inconsistent with previous reports. Here, we discover that it is aluminum oxide film that efficiently restricts the growth of crystalline Al dendrite and thus improves the cycling stability of Al anode. The key role of surficial aluminum oxide film in protecting Al metal anode lies in decreasing the nucleation sites, controlling the metallic dendrite growth, and preventing the electrode disintegration. The defect sites in aluminum oxide film provide channels for electrolyte infiltration and further stripping/depositing. Attributed to such a protective aluminum oxide film, the Al-graphene full cells can attain up to 45 000 stable cycles.
铝箔作为锂离子电池的阳极材料，具有理论容量高、安全性能好、成本低等优点。然而，铝箔的金属性质很可能导致严重的枝晶生长，进一步导致电极解体和电池失效，这与之前的报道不一致。在这里，我们发现是氧化铝薄膜有效地抑制了结晶态铝枝晶的生长，从而提高了铝阳极的循环稳定性。表面氧化铝薄膜在保护铝金属阳极方面的关键作用在于减少成核点、控制金属枝晶生长和防止电极解体。氧化铝薄膜中的缺陷部位为电解液的渗透和进一步的剥离/沉积提供了通道。由于这种保护性氧化铝薄膜的存在，铝-石墨烯全电池可以达到多达 45000 次的稳定循环。
