In this critical review, metal oxides-based materials for electrochemical supercapacitor (ES) electrodes are reviewed in detail together with a brief review of carbon materials and conducting polymers. Their advantages, disadvantages, and performance in ES electrodes are discussed through extensive analysis of the literature, and new trends in material development are also reviewed. Two important future research directions are indicated and summarized, based on results published in the literature: the development of composite and nanostructured ES materials to overcome the major challenge posed by the low energy density of ES (476 references).

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A review of electrode materials for electrochemical supercapacitors

Lithium metal is an ideal battery anode. However, dendrite growth and limited Coulombic efficiency during cycling have prevented its practical application in rechargeable batteries. Herein, we report that the use of highly concentrated electrolytes composed of ether solvents and the lithium bis(fluorosulfonyl)imide salt enables the high-rate cycling of a lithium metal anode at high Coulombic efficiency (up to 99.1%) without dendrite growth. With 4 M lithium bis(fluorosulfonyl)imide in 1,2-dimethoxyethane as the electrolyte, a lithium|lithium cell can be cycled at 10 mA cm(-2) for more than 6,000 cycles, and a copper|lithium cell can be cycled at 4 mA cm(-2) for more than 1,000 cycles with an average Coulombic efficiency of 98.4%. These excellent performances can be attributed to the increased solvent coordination and increased availability of lithium ion concentration in the electrolyte. Further development of this electrolyte may enable practical applications for lithium metal anode in rechargeable batteries.

/pdf/high-rate-and-stable-cycling-of-lithium-metal-anode-15wtg2q4yn.pdf

High rate and stable cycling of lithium metal anode

Transparent conductors as solar energy materials: A panoramic review

Recent Advances in Polyoxometalate-Catalyzed Reactions

Electrochromic tungsten oxide films: Review of progress 1993–1998

Amorphous V2O5/carbon composites as electrochemical supercapacitor electrodes

Proton conductivity of tungsten trioxide hydrates at intermediate temperature

A mixture of metallic vanadium, tungsten and molybdenum powder was dissolved in a hydrogen peroxide solution, to yield a polyvanadate sol containing W and Mo. A thin film of V1-x-yWxMoyO2 was fabricated on a fused silica substrate by spin-coating using such a sol followed by reduction in hydrogen and successive annealing in a nitrogen atmosphere. Thin films in the system V1-x-zWxTizO2 were similarly prepared using a sol containing W and Ti. All the films obtained in this study showed a clear thermochromic switching performance with a large transmittance change in the infrared region. For V1-x-yWxMoyO2, the switching temperature (Tt) was lowered by doping at approximately Tt=Tt0 (=67?C)-ax-by, where a and b are the decrease rates of each individual dopant (about 1920 and 870?C, respectively, for 0x, y0.03). Doping of Ti had little effect on Tt, but markedly reduced hysteresis of the transition. We demonstrated that a double-doped film of V1-x-zWxTizO2 (x=0.018 and y=0.10) showed thermochromic switching almost without any hysteresis at a temperature as low as 45?C.

https://iopscience.iop.org/article/10.1143/JJAP.40.1391/pdf

Thermochromic Properties of Double-Doped VO2 Thin Films Prepared by a Wet Coating Method Using Polyvanadate-Based Sols Containing W and Mo or W and Ti

Layered double hydroxide nanoparticles (LDHNPs) with exceptionally small particle sizes are synthesized using a tripodal ligand of tris(hydroxymethyl)aminomethane (THAM). For example, a LDHNP with the average size of 9.7 nm (denoted as LDH(10 nm), containing CO32– in the interlayer), can be synthesized using a 2.0 M THAM solution. The 13C CP/MAS NMR and FTIR analyses show that THAM is ligated to the layer as an alkoxide species. The average particle size of LDH synthesized using l-lysine (buffering base) instead of THAM is larger (47.9 nm) than that of LDH(10 nm). Therefore, the size reduction is possibly explained by the specific interaction of THAM with the layer via its multiple coordination. In addition, it is confirmed by the 13C CP/MAS NMR analysis that LDH(10 nm) possesses CO32– species weakly interacting with the layers. LDHNPs, in particular, as-synthesized LDH(10 nm) (denoted as LDH(10 nm)-as, containing CO32– and Cl– in the interlayer), possesses the extremely high anion exchange abilities, and...

Mitsuhiro Hibino

Papers

Amorphous V2O5/carbon composites as electrochemical supercapacitor electrodes

Proton conductivity of tungsten trioxide hydrates at intermediate temperature

Thermochromic Properties of Double-Doped VO2 Thin Films Prepared by a Wet Coating Method Using Polyvanadate-Based Sols Containing W and Mo or W and Ti

Tripodal Ligand-Stabilized Layered Double Hydroxide Nanoparticles with Highly Exchangeable CO32–

Characterization of vanadium oxide sol as a starting material for high rate intercalation cathodes