Layered Niobium Oxide Hydrate Anode with Excellent Performance for Lithium-Ion Batteries

Abstract

Benefiting from the advantages of cost-effectiveness and sustainability, lithium-ion batteries (LIBs) are recognized as a next-generation energy technology with great development potential. Herein, niobium oxide hydrate (H 3 ONb 3 O 8 ) synthesized by a facile and inexpensive solvothermal method is proposed as the anode of LIBs. It is a layered two-dimensional material composed of negatively charged two-dimensional lamellae and positively charged interlayer hydronium ions. The former consist of NbO 6 octahedral units connected by bridging oxygen. Because of the mutual effect of hydronium ions and niobium oxide quantum dots, niobium oxide hydrate exhibits excellent electrochemical activity when used as an anode material. This compound is first applied to lithium-ion batteries, obtaining a high specific capacity (1232 mAh g −1 ) at 100 mA g −1 and maintaining an outstanding performance after 200 cycles. Therefore, this work not only proposes a simple preparation method of niobium oxide hydrate but also expands the variety of high-performance anode materials.

Highly Flexible PEDOT Film Assembled with Solution-Processed Nanowires for High-Rate and Long-Life Solid-State Supercapacitors

“…For instance, the conductivity of the PEDOT film prepared by oxidative chemical vapor deposition and HBr acid treatment reaches as high as 6259 S cm –1 . More importantly, the PEDOT electrode exhibits outstanding electrochemical stability in view of its reversible and rapid doping–dedoping process. − On the basis of its rapid energy storage behavior and intriguing physicochemical properties, PEDOT is capable of serving as attractive conductive layers, which not only significantly improves the rate capability of pseudocapacitive electrodes but also protects the underlying components from structure degradation. − In addition, PEDOT had been incorporated between graphene ,− and MXene to efficiently suppress the serious sheet stacking. Despite favorable ion transport being achieved, these electrodes lack sufficient flexibility for device assembly.…”

PEDOT Nanowires Connecting Exfoliated HNb3O8 Nanosheets as High-Rate Anode for Lithium-Ion Capacitor

“…Figure i shows the Nb 3d XPS spectra of E-HNb 3 O 8 and the E-HNb 3 O 8 -PEDOT-0.2 composite electrode. Two sharp peaks at 207.1 and 209.8 eV are assigned to the spin–orbit slitting of Nb 3d 3/2 and 3d 5/2 , respectively . The separation energy of 2.7 eV indicates the existence of Nb 5+ in both E-HNb 3 O 8 and E-HNb 3 O 8 -PEDOT-0.2 electrodes.…”

Cycling-Induced Capacity Increase of Bulk and Artificially Layered LiTaO3 Anodes in Lithium-Ion Batteries

“…Moreover, the superior capacity and rate capability of the S-LTO electrode can be attributed to the presence of structural hydrates in this electrode that can provide a layered structure and also enable capacitive Li + storage in this electrode. , …”