Nitrogen-doped polymer nanofibers decorated with Co nanoparticles for uniform lithium nucleation/growth in lithium metal batteries
Nitrogen-doped polymer nanofibers decorated with Co nanoparticles for uniform lithium nucleation/growth in lithium metal batteries
复制标题
用钴纳米粒子装饰的氮掺杂聚合物纳米纤维用于锂金属电池中均匀的锂成核/生长
作者：
Miao Shu;Xing Li;Liqiang Duan;Mengting Zhu;Xing Xin
锂（Li）金属因其高比容量（3860 mA h g−1）和低氧化还原电位（−3.04 V vs. SHE）而被认为是新一代锂电池最有前途的阳极。然而，在电池循环过程中Li枝晶的形成不仅导致性能差，例如低库仑效率和短循环，而且还导致严重的安全风险，例如火灾和爆炸。在本文中，我们提出了一种新的中间层与三维网络，这是丰富的含氮官能团和钴纳米粒子，以引导均匀的锂成核/生长，从而减轻锂枝晶的形成。因此，设计的复合材料提供了1500小时的超长寿命，对称电池的电压曲线小而稳定，为38.1 mV。该复合电极在以LiFePO 4为正极的锂离子电池（LIB）中也表现出突出的电化学性能。我们的研究结果为通过引入亲锂位点来诱导Li的均匀成核提供了强有力的支持，这对于抑制Li树枝状结构的形成非常重要。
Lithium (Li) metal is deemed to be the most promising anode for new-generation lithium batteries due to its high specific capacity (3860 mA h g−1) and low redox potential (−3.04 V vs. SHE). However, Li dendritic formation during battery cycling results not only in poor performance, such as low coulombic efficiency and short cycling, but also serious safety risks such as fire and explosion. In this paper, we propose a novel interlayer with a 3D network which is rich in N-containing functional groups and Co nanoparticles to guide uniform Li nucleation/growth and thus relieve the Li dendritic formation. As a result, the as-designed composite delivers an ultra-long lifespan of 1500 h with a small and stable voltage profile of 38.1 mV for symmetric cells. The composite electrode also exhibits a prominent electrochemical performance in full cells with LiFePO4 as the cathode for lithium ion batteries (LIBs). Our findings provide strong support for inducing the uniform nucleation of Li by introducing lithiophilic sites, which is important for inhibiting Li dendritic formation.