Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 14, Pages 16300-16309Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02080
Keywords
MoS2; Ti3C2Tx MXene; dual-phase TiO2; heterostructure; low-temperature performance; full cell
Funding
- Natural Science Foundation of Shandong Province, China [ZR2021QE192]
- Postdoctoral Science Foundation of China [2018M63074]
- Source Innovation Project of Qingdao [19-6-2-19cg]
- Qingdao Postdoctoral Applied Research Project, Shandong Provincial Natural Science Foundation [ZR2018JL021]
- Key Research and Development Program of Shandong Province [2019GGX102067]
- Natural Science Foundation of Hebei Province [B2019204009]
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Researchers have successfully addressed the issue of volumetric expansion during cycling in layered molybdenum disulfide (MoS2) by designing a three-dimensional heterostructure of MoS2@MXene@D-TiO2. This unique structure prevents aggregation and restacking of MoS2 and promotes high Na+ transportation, resulting in an impressive high-rate reversible capacity and excellent cycling stability in sodium-ion batteries.
As a promising energy-storage and conversion anode material for high-power sodium-ion batteries operated at room temperature, the practical application of layered molybdenum disulfide (MoS2) is hindered by volumetric expansion during cycling. To address this issue, a rational design of MoS2 with enlarged lattice spacing aligned vertically on hierarchically porous Ti3C2Tx MXene nanosheets with partially oxidized rutile and anatase dual-phased TiO2 (MoS2@MXene@D-TiO2) composites via one-step hydrothermal method without following anneal process is reported. This unique plane-to-surface structure accomplishes hindering MoS2 from aggregating and restacking, enabling sufficient electrode/electrolyte interaction simultaneously. Meanwhile, the heterogeneous structure among dual-phased TiO2, MoS2, and MXene could constitute a built-in electric field, promoting high Na+ transportation. As a result, the as-constructed 3D MoS2@MXene@D-TiO2 heterostructure delivers admirable high-rate reversible capacity (359.6 mAh g(-1) up to 5 A g(-1)) at room temperature, excellent cycling stability (about 200 mAh g(-1)) at a low temperature of -30 degrees C, and superior electrochemical performance in Na+ full batteries by coupling with a Na3V2(PO4)(3) cathode. This ingenious design is clean and facile to inspire the potential of advanced low-dimensional heterogeneous structure electrode materials in the application of high-performance sodium-ion batteries.
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