Pre-swelled nanostructured electrode for lithium ion battery: TiO2-pillared layered MnO2

Composition‐Tailored 2 D Mn1−xRuxO2 Nanosheets and Their Reassembled Nanocomposites: Improvement of Electrode Performance upon Ru Substitution

“…The measured capacitance of the studied nanocomposite materials is much greater than those of layered d-MnO 2 materials ever reported. [10,18,30,[44][45][46][47][48] In one instance, the previously reported nanoplates of layered d-MnO 2 show quite inferior specific capacitance ( % 230 F g À1 for the first cycle and % 150 F g À1 for the 500th cycle) over the present data of the reassembled Li-Mn 0.9 Ru 0.1 O 2 nanocomposites. [10] In comparison with the layered d-MnO 2 , tunnel-structured a-MnO 2 possesses better electrode activity; the a-MnO 2 nanocrystal prepared by the microemulsion method demonstrates a larger initial capacitance of approximately 297 F g À1 but suffers from severe capacitance fading to about 210 F g À1 after the 500th cycle.…”

“…Conversely, the electrode activity of the reassembled Li-MnO 2 nanocomposite is prominently enhanced by the partial replacement of Mn with Ru. The resulting Li-Mn 1Àx Ru x O 2 nanocomposites display much better electrode performance than most layered MnO 2 -based electrode materials ever reported, [10,18,30,[44][45][46][47][48] thus underscoring the usefulness of the Ru-substituted Mn 1Àx Ru x O 2 nanosheets in exploring new efficient electrode materials. Taking into account the fact that the very small thickness of exfoliated Mn 1Àx Ru x O 2 nanosheet makes possible a strong electronic coupling with nanostructured carbon species, [48,55] a further optimization of the electrode functionality of these Li-Mn 1Àx Ru x O 2 nanocomposites would be achieved by hybridization with graphene or carbon nanotubes.…”

“…The obtained metal oxide 2 D nanosheets with controlled chemical compositions can be readily hybridized with various guest species in terms of electrostatic interaction. [29,30] The resulting nanocomposite materials possess a highly porous structure created by the house-of-cards-type stacking of the host nanosheets, which is also beneficial in optimizing the electrode performance of manganese oxide for supercapacitors. [29,30] However, at the present time we are not aware of any reports about the optimization of the electrode performance of exfoliated 2 D nanosheet-based composite materials through the fine-tuning of chemical composition.…”

Recent Applications of 2D Inorganic Nanosheets for Emerging Energy Storage System

“…Kang et al reported that the intercalativeh ybridization of TiO 2 nanoparticles with the layered MnO 2 nanosheets improves its LIB electrode performance due to the small particles ize, increased interlayer spacing, and enhanced surfacea rea. [90] Coating the surfaceo fa na ctive material is well-known technique for enhancing the electrochemical properties, whichr esults in the protection of active material from severe volume change and disintegration during cycling, and formation of uniform and stable solid-electrolyte interface (SEI). Metal oxidesh ave also been used as coating materials, such as Al 2 O 3 and HfO 2 ,w hich were coated on MoO 3Àx and MoS 2 nanosheets and used as electrode materials for SIB.…”

Exfoliation of Dion-Jacobson Layered Perovskite into Macromolecular Nanoplatelet

“…TBA + molecules were known to be a very good reagent for exfoliation because it could induce spontaneous osmotic swelling of layered compounds. + molecules, 9,11 suggesting that a monolayer of TBA + molecules was formed in the intersheet region. Very broad (00l) reflections could be ascribed to stacking faults during the intercalation of bulky ammonium molecules.…”