Density‐modulated multilayered homo‐junction tungsten oxide anode materials for high‐capacity Li‐ion batteries with long‐term stability

Abstract

Summary We report an effective strategy generally applicable towards improving Li‐ion battery performance with insulating metal oxide‐based anode materials. We fabricated density‐modulated multilayered homo‐junction tungsten oxide (WOx) films as anode materials for Li‐ion batteries, in which high‐ and low‐density thin layers were alternately deposited on Cu current collectors using radio frequency magnetron sputtering. The performance of the battery with multilayered WOx was systematically optimized by changing the number of layers and deposition order. A 4‐layer density‐modulated WOx anode with a low density on top WOx layer showed superior performance with a high reversible capacity of 508 mAh g−1 after 200 cycles at a current density of 0.2 A g−1. Moreover, it provided a reversible capacity of 150 mAh g−1 and good coulombic efficiency of 93.7% after 1000 cycles at a high current density of 2 A g−1 and showed excellent rate capability and cycling stability. The observed outstanding battery performance of the density‐modulated multilayer WOx anode can be attributed to its controlled mass loading, optimized charge‐transfer kinetics, and favourable morphology.

Anchoring tungsten oxide nanorods on TiO2 nanowires coupled with carbon for efficient lithium-ion storage

“…[21][22][23][24][25] Among them, tungsten oxide (WO x ), as a desirable anode material for LIBs, has a higher theoretical specific capacity than commercial graphite anodes. 26,27 However, the low electron transfer of tungsten oxide leads to its poor cycling properties, which limits its application as an anode material. 28,29 Currently, transition-metal dopamine hybrids, such as metal chelates, are commonly used as templates or precursors to prepare various nanostructures.…”

Copper cobalt tin sulphide (Cu2CoSnS4) anodes synthesised using a chemical route for stable and efficient rechargeable lithium-ion batteries

“…4 Thus, various substances have been investigated as promising alternative anode materials for LIBs. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] Tin is known to be an optimum anode due to its high theoretical capacity of 994 mA h g −1 , while being inexpensive and non-toxic. For LIBs, alloy-type materials and metal chalcogenides are considered outstanding because of their high theoretical reversible charge storage capacity.…”

“…4 Thus, various substances have been investigated as promising alternative anode materials for LIBs. 5–18…”