Coupling a 3D Lithophilic Skeleton with a Fluorine-Enriched Interface to Enable Stable Lithium Metal Anode
Coupling a 3D Lithophilic Skeleton with a Fluorine-Enriched Interface to Enable Stable Lithium Metal Anode
复制标题
将 3D 亲石骨架与富氟界面耦合以实现稳定的锂金属阳极
DOI：
10.1021/acsami.1c09353
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发表时间：
2021
影响因子：
9.5
通讯作者：
Liu Hongbo
中科院分区：
文献类型：
--
作者：
Gan He;Wang Rilei;Wu Jing;Chen Hui;Li Run;Liu Hongbo
锂金属阳极被认为是下一代高能量密度可充电电池的潜在阳极候选者。然而，不可控的锂枝晶生长和脆弱的固体电解质界面（SEI）层所带来的挑战严重阻碍了锂金属电池的商业化应用。在此，我们报道了一种富氟氮掺杂中空碳球装饰碳纤维骨架（FNCS@CF），它有效地将均匀分布的亲石位点和机械坚固的富lif SEI结合在一起，从而赋予复合锂金属阳极耐用和无枝晶的特征。由于吡啶/吡啶氮具有很强的亲锂性，使得锂成核屏障大大降低。氟化中空碳球不仅可以为Li沉积提供强大的环境，而且可以促进富lif SEI的原位形成。结果表明，制备的FNCS@CF骨架具有优异的电化学性能，在3 mA h cm - 2下，在240次循环中平均库仑效率高达99.6%，具有优异的循环性（1300 h），沉积过电位低至10 mV。此外，还组装了FNCS@CF-Li|NCM全电池，即使在模拟的实际工作条件下，即低负电容量（N/P）比为1.5，贫电解质为10 uL mAh-1，也表现出突出的循环稳定性和容量保持性。
Lithium (Li) metal anode is known as a potential anode candidate for next-generation high-energy-density rechargeable batteries. Nevertheless, the challenge caused by the uncontrollable Li dendrites’ growth and the fragile solid electrolyte interface (SEI) layer seriously hinders the commercial application of Li metal batteries. Herein, we report a fluorine-enriched nitrogen-doped hollow carbon spheres decorated carbon fibers (FNCS@CF) skeleton which effectively integrates the uniformly distributed lithophilic sites and mechanically robust LiF-enriched SEI, thus endowing the composite Li metal anode with durable and dendrite-free features. The Li nucleation barrier is greatly reduced owing to the strong lithiophilicity characteristics of pyridinic/pyrrolic nitrogen. The fluorinated hollow carbon spheres can not only provide a powerful setting for Li deposition but can also promote the in situ formation of LiF-enriched SEI. As a result, the prepared FNCS@CF skeleton demonstrates excellent electrochemical performances such as ultrahigh average Coulombic efficiency of 99.6% over 240 cycles at 3 mA h cm–2and remarkable cyclability (1300 h) with a low deposition overpotential of 10 mV. Furthermore, a FNCS@CF-Li|NCM full cell was also assembled which exhibits a prominent cycling stability and capacity retention even under simulated practical working conditions, i.e., low negative-to-positive capacity (N/P) ratio of 1.5 and lean electrolyte of 10 uL mAh–1.