Few-layer NbSe2@graphene heterostructures as anodes in lithium-ion half- and full-cell batteries

Adv Energy and Sustain Res

et al. 2020

In various energy storage devices, the development and research of electrode materials has always been a key factor. Nb‐based materials are one choice of energy storage materials because of the good ion‐diffusion channels and high theoretical capacity. More importantly, their advantages, such as safe potential range, high structural stability, and highly reversible redox reaction with small strain, are conducive to efficient, safe, and stable energy storage development. Based on aforementioned superiority, much of the research is to further optimize performance of Nb‐based materials by unique nano‐morphology design, lattice regulation, and functional additives composition, showing good electrochemical performance in many kinds of devices. This review mainly introduces the classification of Nb‐based materials used for energy storage, their application in different battery systems, and common optimization methods. Accordingly, the deficiencies and prospects of Nb‐based materials are also discussed in detail.

Section: Niobiyl Sulfidementioning

confidence: 99%

Optimization Design and Application of Niobium‐Based Materials in Electrochemical Energy Storage

Lian

Yang

Adv Energy and Sustain Res

et al. 2020

“…However, as a result of the intermittent shortcoming of these energy sources, it is necessary to develop a suitable energy storage system . Lithium-ion batteries (LIBs) become promising energy storage devices as a result of their long life and high energy density. − At the same time, sodium-ion batteries (SIBs) have entered people’s view as a result of the low cost and abundant storage of sodium. − Nevertheless, the practical application of SIBs requires electrode materials with high energy density, long cycle performance, and high rate performance. ,, At present, many studies on electrode materials have been carried out. − Among the common anode materials, the carbonaceous materials featuring a low cost exhibit excellent cycle stability in both LIBs and SIBs. However, their low specific capacity is insufficient to meet the demands of higher energy density batteries. , Conversion-type anode materials have a higher capacity than carbonaceous materials on account of the conversion reaction with lithium and sodium ions, but the problem of poor cyclic stability caused by the associated huge volume change in the reaction process still needs to be solved. ,,, Therefore, it is urgent to develop moderate anode material with both a long cycle life and high capacity.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Nb-based chalcogenides have shown their great potential in the energy storage field in view of their outstanding electrochemical performances. − For example, LiNb 3 O 8 was reported as the anode material in LIBs and found to have high initial discharge capacity (351 mAh g –1 ) as well as good cycle stability by Jian et al NbSe 2 has been extensively studied as a competitive anode material for LIBs and SIBs as a result of its proper layer distance and high electronic conductivity. ,,− Meanwhile, the selenium-rich Nb 2 Se 9 material has been found to have the advantages of high thermal stability, small bandgap, and large surface area. − However, until now, there are no reports about Nb 2 Se 9 as an anode for LIBs and SIBs. It should be noted that suitable anode materials usually require a suitable exposed area to provide more active sites.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Flower-Like Nb₂Se₉ as High-Performance Anode Materials for Lithium-Ion and Sodium-Ion Batteries

et al. 2021

Energy Fuels

In this work, a flower-like Nb2Se9 material was obtained by a simple oil-phase-assisted synthesis route and used as an anode in lithium-ion and sodium-ion batteries first. It exhibited a high charge capacity (672.35 mAh g–1 at 100 mA g–1), good cycling stability (596.63 mAh g–1 after 250 cycles at 100 mA g–1), and outstanding rate performance (285 mAh g–1 at 5 A g–1) in lithium-ion batteries. Meanwhile, the ex situ X-ray diffraction result reveals that the lithium storage mechanism of Nb2Se9 is the conversion reaction. As an anode for sodium-ion batteries, Nb2Se9 delivered an initial reversible capacity of 342.60 mAh g–1 at the current density of 100 mA g–1 and was stabilized at 230.36 mAh g–1 over 500 cycles after the initial 50 cycles. Excellent electrochemical performance may be attributed to the special micro–nano hierarchical structure of the flower-like Nb2Se9 material, which greatly promotes ion diffusion and provides abundant active sites. These results indicate that flower-like Nb2Se9 is a promising anode material for both lithium-ion and sodium-ion batteries.

“…These anode materials suffer from various issues, including severe volume change, low capacity, and poor electronic conductivity. [22][23][24] 24 Therefore, new anode materials must be designed to replace the traditional anode materials. The new anode materials can release high specific capacity and keep structural stability during electrochemical cycles.…”

Section: Introductionmentioning

confidence: 99%

“…Although these materials show superior electrochemical performance, there are still many problems to be solved. These anode materials suffer from various issues, including severe volume change, low capacity, and poor electronic conductivity 22–24 . Therefore, new anode materials must be designed to replace the traditional anode materials.…”

Section: Introductionmentioning

confidence: 99%

Morphology controlled NiCo₂O₄ as anode materials for high electrochemical performance lithium‐ion batteries

Huo

Zhang

J of Chemical Tech & Biotech

2020

BACKGROUND: Due to the high energy density of lithium-ion batteries, they have become the main power sources for electric vehicles. However, lithium-ion batteries suffer from severe capacity fading during their electrochemical cycles. Therefore, it is significant to develop perfect electrode materials for lithium-ion batteries. It is known that the traditional anode materials have low specific capacity value and poor cycle performance. To overcome this problem, a novel anode material is designed in our work. RESULTS: In electrochemical tests, the initial specific capacity of the NiCo 2 O 4 spheres/nanosheets (NCOs/n) electrode is as high as 1426 mAh g −1 at the current density of 0.2 C. The capacity of the NCOs/n electrode can maintain at 1020 mAh g −1 at the current density of 1C after 1000 cycles. CONCLUSIONS: The as-prepared NCOs/n electrodes exhibit high specific capacity value and superior cycle stability in high current densities.