 This paper proposes a novel method for protecting metal electrodes used in lithium ion batteries. The authors designed a metal electrode skin, MES, which consists of two layers of fluorinated graphene oxide and a prussian blue coating. The fluorinated graphene oxide layer acts as a barrier against corrosive elements, while the prussian blue coating helps to reduce the formation of dendritic deposits on the surface of the electrode. The resulting MES is able to significantly extend the lifetime of the battery cells, with one cell achieving more than 1,600 cycles before failure. Additionally, another cell consisting of potassium and prussian blue achieved a cycle life of more than 5,000 cycles. These results demonstrate the potential of using bionic principles to improve the performance of lithium ion batteries. This article was authored by Hongbo Ding, Zhu Wang, Jiang Du, and others.