Fe 3 N constrained inside C nanocages as an anode for Li-ion batteries through post-synthesis nitridation

The practical applications of Mn O in lithium-ion batteries are greatly hindered by fast capacity decay and poor rate performance as a result of significant volume changes and low electrical conductivity. It is believed that the synthesis of nanoscale Mn O combined with carbonaceous matrix will lead to a better electrochemical performance. Herein, a convenient route for the synthesis of Mn O nanoparticles grown in situ on hollow carbon nanofiber (denoted as HCF/Mn O ) is reported. The small size of Mn O particles combined with HCF can significantly alleviate volume changes and electrical conductivity; the strong chemical interactions between HCF and Mn O would improve the reversibility of the conversion reaction for MnO into Mn O and accelerate charge transfer. These features endow the HCF/Mn O composite with superior cycling stability and rate performance if used as the anode for lithium-ion batteries. The composite delivers a high discharge capacity of 835 mA h g after 100 cycles at 200 mA g , and 652 mA h g after 240 cycles at 1000 mA g . Even at 2000 mA g , it still shows a high capacity of 528 mA h g . The facile synthetic method and outstanding electrochemical performance of the as-prepared HCF/Mn O composite make it a promising candidate for a potential anode material for lithium-ion batteries.

Section: Introductionmentioning

confidence: 99%

In Situ Synthesis of Mn₃O₄ Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode

Zhang

Jiang

et al. 2018

“…Thus, these will be af ocus of our future research. With the consumption of fossil energy,t he demand for electrical energy is increasing, which requires the development of new energy storage devices, for example, lithium ion batteries (LIBs), [81][82][83][84]87] dye-sensitized solar cells [59b, 88] ,a nd supercapacitors. [90] Owing to high energy density and ah ighc apacity,l ithium ion batteries have attracted wide attention from researchers and play an important role for mobile electric applications.…”

Section: Methodsmentioning

confidence: 99%

“…For instance, Huang et al synthetized carbon-constrainedF e 3 Nn anoparticles (Fe 3 N@C), with au nique core-shell structure, which were applieda st he anode materialf or lithium-ion batteries and exhibited excellent electrochemical Li-ion storagep roperties, as shown in Figure 17. [87] Their excellent performance comesf rom the electrochemical lithiation/delithiation reactivity of the Fe 3 N core, with the stable nanostructure of the electrodes sustained in the long cycles,a sb enefited from the constraint of the carbon shell.I ns ummary,i ron carbides or iron nitrides are used as an active material in the carbon-based anode materials, and substantially increaset he properties of the carbon materials.N ot only that, iron carbides or iron nitrides play an importantr ole in the stability of the electrode, which expands the scope of use of lithium ion batteries.…”

Section: Methodsmentioning

confidence: 99%

Iron Carbides and Nitrides: Ancient Materials with Novel Prospects

Zhang

Lei

et al. 2018

Iron carbides and nitrides have aroused great interest in researchers, due to their excellent magnetic properties, good machinability and the particular catalytic activity. Based on these advantages, iron carbides and nitrides can be applied in various areas such as magnetic materials, biomedical, photo- and electrocatalysis. In contrast to their simple elemental composition, the synthesis of iron carbides and nitrides still has great challenges, particularly at the nanoscale, but it is usually beneficial to improve performance in corresponding applications. In this review, we introduce the investigations about iron carbides and nitrides, concerning their structure, synthesis strategy and various applications from magnetism to the catalysis. Furthermore, the future prospects are also discussed briefly.

“…The Li-ion battery (LIB) is regarded as the mosts uitable candidate to satisfy energy storage needs due to its advanced development stage. [6] Two-dimensional (2D) materials such as graphene, [7] sulfides, [8,9] nitrides, [10,11] ando xides [12,13] have attracted considerable interest because of their unique and beneficial physical and chemical properties when used as LIB anode materials. [6] Two-dimensional (2D) materials such as graphene, [7] sulfides, [8,9] nitrides, [10,11] ando xides [12,13] have attracted considerable interest because of their unique and beneficial physical and chemical properties when used as LIB anode materials.…”

Section: Introductionmentioning

confidence: 99%

Thermally Reduced Graphene/MXene Film for Enhanced Li‐ion Storage

Dall’Agnese

et al. 2018

Two-dimensional transition-metal carbides called MXenes are emerging electrode materials for energy storage due to their metallice lectrical conductivity and low ion diffusion barrier.I nt his work, we combinedT i 2 CT x MXene with graphene oxide (GO) followed by at hermalt reatment to fabricate flexible rGO/Ti 2 CT r film, in which electrochemically active rGO and Ti 2 CT r nanosheets impedet he stacking of layers and synergistically interactp roducing ionically and electronically conducting electrodes. The effect of the thermal treatment on the electrochemical performance of Ti 2 CT x is evaluated. As anode for Li-ion storage, the thermally treated Ti 2 CT r possesses ah igherc apacity in comparison to asprepared Ti 2 CT x .T he freestanding hybrid rGO/Ti 2 CT r films exhibit excellent reversible capacity (700 mAh g À1 at 0.1 Ag À1 ), cycling stability and rate performance. Additionally,f lexible rGO/Ti 3 C 2 T r films are made using the same method and also present improved capacity.T herefore, this study providesa simple, yet effective, approach to combine rGO with different MXenes, which can enhancet heir electrochemical properties for Li-ion batteries.[a] Dr.