Aqueous zinc ion batteries based on sodium vanadate electrode materials with long lifespan and high energy density

Abstract

We have prepared Na7V7.6O20·4H2O (NVO) nanobelts by a facile hydrothermal route. The assembled NVO/Zn batteries deliver a capacity of 309.4 mA h g−1 at 0.3 A g−1 and maintain excellent cycling stability after 10 000 cycles at 10 A g−1.

Enhanced Electrochemical Performance of Zn/VOx Batteries by a Carbon-Encapsulation Strategy

“…When discharged to 0.2 V, the Zn 2p peaks present strong signals at 1022.6 eV (2p 3/2 ) and 1045.7 eV (2p 1/2 ). The peaks of Zn 2p are significantly weakened in the charging process, suggesting the presence of residual Zn 2+ …”

“…The peaks of Zn 2p are significantly weakened in the charging process, suggesting the presence of residual Zn 2+ . 45 TEM is employed to further investigate the morphological change of the electrodes. The microsphere structure of the VO 2 @C-0.5 electrode is still maintained during cycling (Figure 6e,g).…”

Ammonium vanadate electrode materials with stable layered structures for rechargeable zinc ion batteries

“…[10][11][12][13][14] Among numerous multivalent ion systems, AZIBs possess a large theoretical capacity of 820 mA h g −1 . 15,16 However, it is challenging to search for suitable cathode materials with excellent stability in water solution. 17 Some progress has been made, including manganese-based oxides, Prussian blue analogs, and vanadium-based materials.…”

Transition metal sulfide/hydroxide electrode materials with high specific capacities

“…At present, the demand for clean energy resources has become overwhelming due to superfluous carbon emission. [1][2][3] As an emerging energy storage device, a supercapacitor not only fills the gap between traditional capacitors and batteries, but also shows many advantages, such as a wide working temperature range and long cycle life. [4][5][6] However, its relatively low energy density hinders its further application.…”