Edge‐NF_x (x=1 or 2) protected graphitic nanoplatelets (NFGnPs) are synthesized for the first time as a stable anode material for lithium storage. The NFGnPs are prepared via mechanochemical reaction, by ball‐milling graphite in the presence of nitrogen trifluoride (NF₃) gas. The average grain size of the NFGnPs is dramatically reduced compared to the starting graphite. The ball‐milling effectively unzips graphitic C−C bonds, generating active carbon species (C^.), which form edge C−NF_x bonds and delaminate the graphite layers into a few layered NFGnPs. The resulting NFGnPs have a large specific surface area (671.0 m² g⁻¹). The edge functionalities of the NFGnPs consist of major C(C)=NF₁ and minor C−NF₂ moieties. Because of their large specific surface area, the NFGnPs display high average reversible capacities of 850.5, 722.4, 576.4, 482.0, 369.1, 229.7, 127.5 mAh g⁻¹ at 0.2, 0.5, 1, 2, 5 and 10 C, respectively, with excellent rate capability. More importantly, due to the edge protection provided by the stable C(C)=NF₁ bonds (pseudo‐aromatic), the NFGnPs maintain a high reversible charge capacity of 421.6 mAh g⁻¹ at 2 C, with an initial capacity retention of 78.3 % after 200 cycles.

中文翻译：

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Edge-NFx（x = 1或2）保护的石墨纳米片作为稳定的锂存储材料

首次合成了Edge‐NF _x（x = 1或2）保护的石墨纳米片（NFGnPs）作为稳定的锂存储阳极材料。NFGnPs是通过机械化学反应，在三氟化氮（NF ₃）气体存在下通过球磨石墨而制备的。与起始石墨相比，NFGnPs的平均晶粒尺寸大大降低。球磨有效解压石墨C-C键，生成碳活性物种（C ^。），其形式缘C-NF _X键和石墨层分层为几个分层NFGnPs。所得的NFGnP具有较大的比表面积（671.0 m ²  g ^-1）。NFGnP的边缘功能包括主要C（C）= NF ₁和次要C-NF ₂部分。由于它们的大比表面积，NFGnP在0.2、0.5、1、2、5和10 C时分别显示出850.5、722.4、576.4、482.0、369.1、229.7、127.5 mAh g ^-1的高平均可逆容量，出色的评分能力。更重要的是，由于稳定​​的C（C）= NF ₁键（伪芳香族）提供的边缘保护，NFGnP在2 C时保持421.6 mAh g ^-1的高可逆充电容量，初始容量保持为200次循环后为78.3％。