Nitrogen-doped polymer nanofibers decorated with Co nanoparticles for uniform lithium nucleation/growth in lithium metal batteries
Lithium (Li) metal is deemed to be the most prospective anode for the new-generation lithium batteries due to its high specific capacity (3860 mAh g-1) and low redox potential (-3.04 V vs SHE). However, Li dendritic formation during the battery cycles result in not only the poor performance such as low coulombic efficiency and short cycling but also the serious safety risks like fire and explosion. In this paper, we proposed a novel interlayer with 3D network which was rich in the N-containing functional groups and Co nanoparticles to guide the uniform Li nucleation/growth thus relieved the Li dendritic formation. As a result, the as-designed composite delivered an ultra-long lifespan of 1500 h with a small and stable voltage profile of 38.1 mV for the symmetric cells. The composite electrode also exhibited prominent electrochemical performance in full cells with LiFePO4 as the cathode for lithium ion batteries (LIBs). Our findings provide strong support for inducing uniform nucleation of Li by introducing lithiophilic sites which is important for inhibiting Li dendritic formation.