Synthesis and electrochemical performance of NaV₆O₁₅ microflowers for lithium and sodium ion batteries

Abstract

High first discharge capacity of 255 mA h g−1 (vs. Li+/Li) and 130 mA h g−1 (vs. Na+/Na) were observed in NaV6O15 microflowers and the capacity retention reaches 105% and 64% after 50 cycles at the current density of 100 mA g−1 and 50 mA g−1, respectively.

NaV6O15 microflowers as a stable cathode material for high-performance aqueous zinc-ion batteries

“…23 In our past work, high-performance NaV 6 O 15 microowers were successfully synthesized as a cathode material for Li/Na-ion batteries. 24 Herein, NaV 6 O 15 microowers are also demonstrated to be a competitive cathode material for ZIBs based on the following parameters: a high initial specic capacity of $300 mA h g À1 at 100 mA g À1 ; 141 mA h g À1 maintained aer 2000 cycles at 5 A g À1 ; and a capacity retention of $107%. Meanwhile, the storage mechanism of the cathode was also investigated.…”

Synthesis and electrochemical performance of NaV3O8 nanobelts for Li/Na-ion batteries and aqueous zinc-ion batteries

“…We speculate that Na ions in NaV 3 O 8 cannot act as a pillar between the [V 3 O 8 ] layers in Na ion batteries, which results to the crystal structure of the sample collapsed during the charge and discharge cycle and indicates a low coulombic efficiency. 30 The electrode presents a rate capability with reversible average discharge capacity of 94, 65, 46 and 18 mA h g À1 at the current densities of 30, 100, 200 and 400 mA g À1 , respectively. When cycling at 100 mA h g À1 again, the discharge capacity remains at 56 mA h g À1 , which indicates NVO nanobelts cathode remains stable aer high rates.…”

“…[1][2][3] However, the Na + has a larger ionic radius (1.06Å) than Li + (0.76Å), which causes sluggish Na + ion kinetics, reversible intercalation difficulties and electrochemical performances lower than those for Li-ion batteries. 4,5 Recently, the extensive study of aqueous zinc ion batteries (ZIBs) has begun owing to their low cost, high theoretical capacity (820 mA h g À1 ), environmentally friendliness and rich global distribution. [6][7][8] The radius of the Zn 2+ ion (0.74 A) is almost the same as that of the Li + ion (0.76Å), but the development of rechargeable aqueous Zn-ion batteries is seriously impeded by the limited choices of suitable cathode materials because of the larger atomic mass and stronger positive polarity.…”

Sodium-Vanadium Bronze Na9V14O35: An Electrode Material for Na-Ion Batteries

“…High discharge capacity of 250 mAh g −1 retained with 88% efficiency after 320 cycles at 20 mA g −1 (3.8–1.5 V vs. Na + /Na) was reported for so-called “bilayered” V 2 O 5 with short-range ordering in the crystal structure, though no structural data were provided for the Na-containing phases formed during the reversible (de)intercalation process [ 20 ]. Nanostructured Na 0.33 V 2 O 5 tested as an electrode material within the potential window of 1.5–4.0 V vs. Na + /Na demonstrated capacity of 130 mAh g −1 at the first discharge, and it showed gradual decay up to 90 mAh g −1 after 50 cycles at a 50 mA g −1 current density [ 21 ].…”