Carbon‐Nanotube‐Encapsulated LiTiOPO₄ Composite Electrode for Aqueous Rechargeable Battery Applications

Abstract

A Single-walled carbon nanotube (SWCNTs)-encapsulated orthorhombic LiTiOPO 4 (LTOP) anode material was explored for use in an aqueous electrolyte. The aqueous rechargeable Li-ion battery was constructed by using LTOP/SWCNTs anode and LiFePO 4 @C (LFP@C) as a cathode in sat. Li 2 SO 4 aqueous electrolyte. The LTOP has been synthesized by using a very simple method through a single-step procedure. Quantitative structural and morphological features of LTOP have been studied via X-ray diffraction, Raman spectra, scanning electron microscopic, energy dispersive X-ray analysis, BET surface area analysis and transmission electron microscopy studies. The electrochemical properties and performance of the battery have been evaluated in half-cell (LTOP/SWCNTs vs. SCE) as well as a full-cell configuration with LFP@C as a cathode. Cyclic voltammetry (CV) was carried out to determine the redox properties and stability. After the CV, electrochemical performance and properties of LTOP/SWCNTs were evaluated through galvanostatic cycling with potential limitation and electrochemical impedance spectroscopic techniques. Further, we have also demonstrated the electrochemical performance and properties of LTOP/SWCNTs composite in the non-aqueous electrolyte.

Exploiting the Physiochemical Interactions between Single-Walled Carbon Nanotubes and Hydrogel Microspheres To Afford Chirally Pure Nanotubes

“…In recent decades, single-walled carbon nanotubes (SWNTs) have been demonstrated as active components within a variety of applications, including nanostructured electronics, , energy harvesting, − energy storage, − composites, − flexible thermoelectrics, , environmental remediation, and biological sensors. , However, widespread use of SWNTs remains limited by a problem of chiral impurity: the varied SWNT geometries (defined by ( n , m ), chiral wrapping vector) produced within common bulk-scale SWNT syntheses exhibit inherently inhomogeneous electronic and structural characteristics . In light of this, efforts have been made to design processes that enrich a single chirality of SWNT. − Some such methods include density gradient ultracentrifugation, − DNA-based chromatography, − and selective adsorption of SWNTs to hydrogel materials, − which is arguably the most scalable of these methods .…”

Rational Design and Engineering of One‐Dimensional Hollow Nanostructures for Efficient Electrochemical Energy Storage

“…Thea pplication of 1D hollow nanostructures in aqueous LIBs has also been reported. [72][73][74] Fore xample,L iTiOPO 4 nanoparticles encapsulated by single-wall carbon nanotubes exhibited an enhanced rate capability and cycling stability, which may result from the stable LiTiOPO 4 crystal framework and highly conductive carbon matrix. [72]…”

The rational design of inorganic and organic material based nanocomposite hybrids as Na-ion battery electrodes

“…Phosphate framework materials have witnessed a dramatic increase in interest in recent years in both LIBs and SIBs owing to their some intrinsic benefits 22,50,[105][106][107][108] such as (i) high structural stability due to the very stable P-O crystal framework, which enables long-term cycling stability (ii) low volumetric expansion and less phase transition, and (iii) offer high 32 redox potential value and low thermal expansion. However, the intrinsic isolating nature of the phosphate group causes poor electron conductivity and moderate capacity.…”