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

Abstract

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 (NH 4 ) 2 V 7 O 16 with brick-like morphology has been investigated as an anode material for aqueous lithiumion batteries and Li + /Na + hybrid ion batteries. The two novel full cell systems (NH 4 ) 2 V 7 O 16 j j Li 2 SO 4 j j LiMn 2 O 4 and (NH 4 ) 2 V 7 O 16 j j Na 2 SO 4 j j LiMn 2 O 4 both demonstrate good rate capability and excellent cycling performance. A capacity retention of 78.61 % after 500 cycles at 300 mA g À 1 was demonstrated in the (NH 4 ) 2 V 7 O 16 j j Li 2 SO 4 j j LiMn 2 O 4 system, whereas no capacity attenuation is observed in the (NH 4 ) 2 V 7 O 16 j j Na 2 SO 4 j j LiMn 2 O 4 system. The reaction mechanisms of the (NH 4 ) 2 V 7 O 16 electrode and impedance variation of the two full cells were also researched. The excellent cycling stability suggests that layered (NH 4 ) 2 V 7 O 16 can be a promising anode material for aqueous rechargeable lithiumion batteries.

Review on Sol-Gel Synthesis of Perovskite and Oxide Nanomaterials

“…Another interesting microstructure are (enH 2 V 7 O 16 ) and (NH 4 ) 2 V 7 O 16 layered-compounds [ 66 , 67 ]. These compounds are synthesized using V 2 O 5 precursor with ethylenediamine (en) suspended in a mixture of water-ethanol.…”

Layered titanium phosphate nanosheets with water in salt electrolyte toward high-voltage aqueous full lithium-ion batteries

“…8 According to reported studies, the anode electrode materials mostly studied in ARLBs mainly include vanadium-based materials such as VO 2 , V 2 O 5 , Li 2 VO 3 and polyanionic materials represented by LiTi 2 (PO 4 ) 3 . [13][14][15][16][17][18][19] Among them, vanadium-based materials undergo structural changes due to the dissolution of vanadium, accompanied by rapid capacity attenuation during cycling. Polyanionic materials have a stable skeleton structure and can provide a good lithium ion diffusion channel, which is expected to be further applied in anode materials.…”

(NH4)2V7O16 as a Cathode Material for Rechargeable Calcium-Ion Batteries: Structural Transformation and Co-Intercalation of Ammonium and Calcium Ions

“…Previously, it was incorrectly known to have several different chemical formulas, such as (NH 4 ) 0.6 V 2 O 5 , (NH 4 ) 2 V 4 O 9 , or NH 4 V 3 O 7 because of its puzzling triclinic structure. It has been used as a cathode material capable of intercalating Li and Zn ions. ,, As shown in Figure a, the crystal structure comprises stacking of V 7 O 16 layers and interlayer ammonium ions, whereas the V 7 O 16 layer consists of the corner- and edge-sharing VO 5 and VO 4 polyhedra. The wide interlayer, enabled by the presence of ammonium ions, renders this material a promising intercalation-type host material.…”