Aluminum (Al) foil, as the most accepted cathode current collector for lithium‐ion batteries (LIBs), is susceptible to local anodic corrosions during long‐term operations. Such corrosions could lead to the deterioration or even premature failure of the batteries and are generally believed to be a bottleneck for next‐generation 5 V LIBs. Here, it is demonstrated that Al foil armored by conformal graphene coating exhibits significantly reinforced anodic corrosion resistance in both LiPF₆ and lithium bis(trifluoromethanesulphonyl) imide (LiTFSI) based electrolytes. Moreover, LiMn₂O₄ cells using graphene‐armored Al foil as current collectors (LMO/GA) demonstrate enhanced electrochemical performance in comparison with those using pristine Al foil (LMO/PA). The long‐term discharge capacity retention of LMO/GA cell after ≈950 h straight operations at low rate (0.5 C) reaches up to 91%, remarkably superior to LMO/PA cell (75%). The self‐discharge propensity of LMO/GA is clearly relieved and the rate/power performance is also improved with graphene mediations. This work not only contributes to the long‐term stable operations of LIBs but also might catalyze the deployment of 5 V LIBs in the future.

中文翻译：

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具有增强的耐腐蚀性能的石墨烯铠装铝箔作为锂离子电池的集电器

铝（Al）箔是锂离子电池（LIB）最受欢迎的阴极集电器，在长期运行过程中易受局部阳极腐蚀的影响。这种腐蚀可能导致电池劣化甚至过早失效，通常被认为是下一代5 V LIB的瓶颈。在此，证明了通过保形石墨烯涂层铠装的铝箔在基于LiPF ₆和双（三氟甲磺酰基）酰亚胺（LiTFSI）的锂中均表现出显着增强的耐阳极腐蚀性能。此外，LiMn ₂ O ₄与使用原始铝箔（LMO / PA）的电池相比，使用石墨烯铠装Al箔作为集电器（LMO / GA）的电池显示出增强的电化学性能。LMO / GA电池在低速（0.5 C）下连续运行约950小时后，LMO / GA电池的长期放电容量保持率高达91％，明显优于LMO / PA电池（75％）。LMO / GA的自放电倾向明显得到缓解，并且石墨烯介导还提高了速率/功率性能。这项工作不仅有助于LIB的长期稳定运行，而且还可能在将来促进5 V LIB的部署。