Layered TiS₂ as a Promising Host Material for Aqueous Rechargeable Zn Ion Battery

Abstract

The aqueous zinc-ion battery (ZIB) is one of several promising energy storage systems because of its low cost, nontoxicity, and high safety. In addition, Zn metal exhibits low redox potential in aqueous solution. However, one big obstacle in the development of ZIBs is the dendrite growth and corrosion reaction of Zn anode. Exploration of the Zn host anode material with high reversible capacity and low redox voltage would be an effective strategy. Herein, layered TiS2 is successfully demonstrated as a durable host material for neutral aqueous ZIBs with a relatively low charge voltage of 0.4 V. The TiS2 material delivers a stabilized capacity of 120 mAh g–1 at 100 mA g–1, high rate capability (76 mAh g–1 at 1000 mA g–1), and good cycle performance (70% capacity retention after 500 cycles at 1000 mA g–1) in a Zn/TiS2 cell. The outstanding electrochemical properties are attributed to the excellent maintenance of TiS2 during cycling in which the Zn2+ cations can be easily inserted/extracted into/from the layered structure with slight structural change, observed from ex situ X-ray diffraction investigation. Mechanism study reveals that TiS2 goes through a reversible (de)­interclation reaction in accompany with valence change of titanium element during cycling. This study would benefit the exploration and design of host materials for rechargeable aqueous batteries, especially for the anode.

Fast‐Charging and Ultrahigh‐Capacity Zinc Metal Anode for High‐Performance Aqueous Zinc‐Ion Batteries

“…[ 10 ] The indium‐based protective layer via the ion‐exchange route onto the surface of Zn anode suppressed corrosion and regulated Zn plating behavior. [ 11 ] And other examples include the ZnO, [ 12 ] TiO 2 , [ 13 ] TiS 2 , [ 14 ] and ZrO 2 layer. [ 15 ] Unfortunately, these coating materials only regarded as an inert protective layer is without any electrochemical reactivity, resulting in the decreasing of the energy density of the battery.…”

A strategy for anode modification for future zinc-based battery application

“…11b), which is large enough to easily accommodate most alkali metal ions based on their size, such as Li + (0.76 Å), Mg 2+ (0.72 Å), Na + (0.98 Å), and Zn 2+ (0.75 Å), making it possible to achieve reversible (de)intercalation of Zn 2+ with a weak interaction force. The relevant reaction equation is as follows: 121 TiS 2 + xZn 2+ + 2xe À -Zn x TiS 2 , (…”

Recent Advances and Future Perspectives of Fiber-Shaped Batteries

“…Such a FSSIB presents high mechanical flexibility and can tolerant the repeated bending without evident capacity decays. Aqueous ZIB is another star energy storage device, owning the advantages of low cost and high theoretical capacity . Wang and co-workers devised a CNT-stitched ZVO NSs@OCNT fiber cathode to assemble FSZIBs .…”

“…Aqueous ZIB is another star energy storage device, owning the advantages of low cost and high theoretical capacity. 143 Wang co-workers a CNT-stitched ZVO NSs@ OCNT fiber cathode to assemble FSZIBs. 95 As demonstrated in Figure 8c, ZVO offers enough spacing for reversible Zn 2+ deintercalation/intercalation, and the CNT-stitched 2D nanosheet structure provides a cross-linked conductive matrix to facilitate the electrode transfer, which improves the electrochemical reaction and mechanical flexibility.…”