Interlayer‐Spacing‐Regulated VOPO4 Nanosheets with Fast Kinetics for High‐Capacity and Durable Rechargeable Magnesium Batteries

• DOI: 10.1002/adma.201801984
• Publication Date: 2018-06-25T16:49:31Z
• Authors: Limin Zhou; Qi Liu; Zihe Zhang; Kai Zhang; Fangyu Xiong; Shuangshuang Tan; Qinyou An; Yong‐Mook Kang; Zhen Zhou; Liqiang Mai
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Owing to the low-cost, safety, dendrite-free formation, and two-electron redox properties of magnesium (Mg), rechargeable Mg batteries are considered as promising next-generation secondary with high specific capacity energy density. However, clumsy Mg2+ polarity inclines sluggish insertion/deinsertion, leading inadequate reversible rate performance. Herein, 2D VOPO4 nanosheets expanded interlayer spacing (1.42 nm) prepared applied in for first time. The expansion provides enough diffusion space fast kinetics MgCl+ ion flux low polarization. Benefiting from structural configuration, battery exhibits a remarkable 310 mAh g-1 at 50 mA , excellent capability, good cycling stability (192 100 even after 500 cycles). In addition, density functional theory (DFT) computations conducted understand electrode behavior decreased migration barrier compared . This approach, based on regulation distance control cation insertion, represents guideline material design development advanced multivalent-ion batteries.