Abstract We, for the first time, fabricated an additive-free Ni-metal organic frameworks (MOFs)-derived NiO/Ni nanocomposite Li-ion battery electrode and probed the intrinsic electrochemical properties, including charge transfer resistance and Li-ion diffusivity during the charging/discharging process. Its specific capacity within the first five cycles showed a capacity of higher than the theoretical specific capacity of NiO (718 mAh/g), which is far greater than that of a conventional slurry-based electrode. We found that, after the 1st cycle where the solid electrolyte interphase layer is formed, the Li-ion diffusivity significantly increased while the charge transfer resistance increased, indicating that the interfacial electrochemical charge transfer resistance associated with electrical conductivity within the electrode led to an initial irreversible capacity loss. We demonstrate that the additive-free system can be applied to probe intrinsic electrochemical properties, serving as an experimental testbed to elucidate the origin of irreversible capacity loss.

中文翻译：

---

无添加剂镍金属有机骨架衍生的空心 NiO/Ni 纳米复合电极的不可逆容量损失作为储能应用的试验台

摘要 我们首次制备了无添加剂的 Ni-金属有机框架 (MOFs) 衍生的 NiO/Ni 纳米复合锂离子电池电极，并探讨了其固有的电化学性能，包括电荷转移电阻和锂离子扩散过程充电/放电过程。它在前五个循环内的比容量显示出高于 NiO 的理论比容量（718 mAh/g），远大于传统的浆料基电极的容量。我们发现，在形成固体电解质中间层的第 1 次循环后，锂离子扩散率显着增加，而电荷转移电阻增加，表明与电极内电导率相关的界面电化学电荷转移电阻导致初始不可逆容量损失。我们证明无添加剂系统可用于探测内在电化学性质，作为实验测试平台，以阐明不可逆容量损失的起源。