Binder-free NiFe2O4/C nanofibers as air cathodes for Li-O2 batteries
Binder-free NiFe2O4/C nanofibers as air cathodes for Li-O2 batteries
复制标题
无粘合剂 NiFe2O4/C 纳米纤维作为 Li-O-2 电池的空气阴极
DOI：
10.1016/j.jpowsour.2017.12.002
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发表时间：
2018-02-15
影响因子：
9.2
通讯作者：
Zhou, Zhen
中科院分区：
文献类型：
--
作者：
Zhang, Xin;Wang, Chengyi;Zhou, Zhen
可充锂氧电池因其高能量密度而受到广泛关注。但是，其可充电性差、效率低的缺点阻碍了其实际应用。为了解决这些问题，采用静电纺丝法制备了自支撑碳膜与高活性NiFe 2 O 4催化剂的复合材料，并将其直接用作Li-O-2电池的空气阴极。所获得的薄膜具有通过堆叠和交错的块状纳米纤维与均匀分散的NiFe 2 O 4纳米颗粒在它们上形成的3D网络。具有这种无粘合剂空气阴极的Li-O-2电池显示出甚至与贵金属阴极相当的低充电过电位，并且可以维持优异的放电/充电循环稳定性。独特的结构和无粘结剂的优势极大地促进了Li+和O-2的扩散，加速了Li 2 O2的分解，避免了聚合物粘结剂的干扰。
Rechargeable Li-O-2 batteries have aroused much attention for their high energy density. However, the poor rechargeability and low efficiency hinder their practical applications. To solve these issues, free-standing carbon films combined with high-activity NiFe2O4 catalysts are prepared by electrospinning method, and directly used as air cathodes for Li-O-2 batteries. The obtained films have 3D networks formed by stacking and interlacing massive nanofibers with uniformly dispersed NiFe2O4 nanoparticles on them. The Li-O-2 batteries with such binder-free air cathodes show low charging overpotential even comparable to precious metal cathodes, and can sustain excellent discharge/charge cyclic stability. The unique structure and binder-free superiority greatly facilitates the Li+ and O-2 diffusion, accelerates the decomposition of Li2O2, and avoid the disturbance of polymer binders.