(NH4)2V7O16 Microbricks as a Novel Anode for Aqueous Lithium-Ion Battery with Good Cyclability

Searching for novel anode materials to address the issues of poor cycle stability in the aqueous lithium-ion battery system is highly desirable. In this work, ammonium vanadium bronze (NH4)(2)V7O16 with brick-like morphology has been investigated as an anode material for aqueous lithium-ion batteries and Li+/Na+ hybrid ion batteries. The two novel full cell systems (NH4)(2)V7O16||Li2SO4||LiMn2O4 and (NH4)(2)V7O16||Na2SO4||LiMn2O4 both demonstrate good rate capability and excellent cycling performance. A capacity retention of 78.61 % after 500 cycles at 300 mA g(-1) was demonstrated in the (NH4)(2)V7O16||Li2SO4||LiMn2O4 system, whereas no capacity attenuation is observed in the (NH4)(2)V7O16||Na2SO4||LiMn2O4 system. The reaction mechanisms of the (NH4)(2)V7O16 electrode and impedance variation of the two full cells were also researched. The excellent cycling stability suggests that layered (NH4)(2)V7O16 can be a promising anode material for aqueous rechargeable lithium-ion batteries.

Automated summary

The study investigated the performance of ammonium vanadium bronze as an anode material for aqueous lithium-ion batteries and Li+/Na+ hybrid ion batteries, showing good rate capability and excellent cycling stability. The capacity retention after 500 cycles was high, indicating potential for applications in rechargeable lithium-ion battery systems.