Wadsley-Roth Phase Niobium-Based Oxide Anode Promising High Power and Energy Density Aqueous Li-Ion Batteries
Xiangzhen Zhu, Minglei Mao, Zejing Lin, Jinming Yue, Meiying Li, Tianshi Lv, Anxing Zhou, Yong‐Sheng Hu, Hong Li, Xuejie Huang, Liquan Chen, Liumin Suo
Abstract
Intermittent and instantaneous renewable energy is urgently needed to develop intrinsic safe electrical energy storage technology with high power-energy density. Aqueous lithium-ion batteries (ALIBs) are a promising integration due to their nonflammable nature. Nevertheless, restricted by the anode materials, their energy density has a considerable gap from that of their nonaqueous counterparts. Herein, Wadsley-Roth phase niobium-based oxides (M–Nb–O) are attempted for aqueous Li-ion anodes for the first time. By pairing with the representation of the M–Nb–O anode (Zn2Nb34O87), the output voltage, energy density, and power density of ALIBs increased remarkably, and long-term cycle life improved significantly. Individually, the energy-type full cell (NCM811//Zn2Nb34O87) yields high-record density energy (191.5 Wh kg–1) with a high average discharge voltage of ∼2.25 V, and the power-energy type full cell (LiMn2O4//Zn2Nb34O87) exhibits a superior rate capability with a high energy density of 30.0 Wh kg–1 at an ultrahigh powder density of 16 489 W kg–1.