scholarly journals Effect of Germanium Incorporation on the Electrochemical Performance of Electrospun Fe2O3 Nanofibers-Based Anodes in Sodium-Ion Batteries

2021 ◽  
Vol 11 (4) ◽  
pp. 1483
Author(s):  
Beatrix Petrovičovà ◽  
Chiara Ferrara ◽  
Gabriele Brugnetti ◽  
Clemens Ritter ◽  
Martina Fracchia ◽  
...  
Keyword(s):  
Electronic Transport ◽  
Active Material ◽  
Specific Capacity ◽  
Rate Capability ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Storage Mechanism ◽  
Tetrahedral Sites ◽  
Charge Storage Mechanism ◽  
Anode Active Material

Fe2O3 and Fe2O3:Ge nanofibers (NFs) were prepared via electrospinning and thoroughly characterized via several techniques in order to investigate the effects produced by germanium incorporation in the nanostructure and crystalline phase of the oxide. The results indicate that reference Fe2O3 NFs consist of interconnected hematite grains, whereas in Fe2O3:Ge NFs, constituted by finer and elongated nanostructures developing mainly along their axis, an amorphous component coexists with the dominant α-Fe2O3 and γ-Fe2O3 phases. Ge4+ ions, mostly dispersed as dopant impurities, are accommodated in the tetrahedral sites of the maghemite lattice and probably in the defective hematite surface sites. When tested as anode active material for sodium ion batteries, Fe2O3:Ge NFs show good specific capacity (320 mAh g−1 at 50 mA g−1) and excellent rate capability (still delivering 140 mAh g−1 at 2 A g−1). This behavior derives from the synergistic combination of the nanostructured morphology, the electronic transport properties of the complex material, and the pseudo-capacitive nature of the charge storage mechanism.

scholarly journals Na2.4Al0.4Mn2.6O7 anionic redox cathode material for sodium ion batteries- a combined experimental and theoretical approach to elucidate its charge storage mechanism

2022 ◽  
Author(s):  
Cindy Soares ◽  
Begoña Silvan ◽  
Yong-Seok Choi ◽  
Veronica Celorrio ◽  
Giannantonio Cibin ◽  
...  
Keyword(s):  
Cathode Material ◽  
Theoretical Approach ◽  
High Performance ◽  
Sodium Ion ◽  
Charge Storage ◽  
Sodium Ion Batteries ◽  
Storage Mechanism ◽  
Charge Storage Mechanism

Here we report the synthesis via ceramic methods of the high-performance Mn-rich Na2.4Al0.4Mn2.6O7 oxygen-redox cathode material for Na-ion batteries which we use as a testbed material to study the effects...

An oxygen-deficient vanadium oxide@N-doped carbon heterostructure for sodium-ion batteries: insights into the charge storage mechanism and enhanced reaction kinetics

2020 ◽  
Vol 8 (6) ◽  
pp. 3450-3458 ◽  
Author(s):  
Qingyuan Ren ◽  
Ning Qin ◽  
Bin Liu ◽  
Yuan Yao ◽  
Xu Zhao ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Reaction Kinetics ◽  
Sodium Ion ◽  
Charge Storage ◽  
Theoretical Studies ◽  
Sodium Ion Batteries ◽  
Storage Mechanism ◽  
Charge Storage Mechanism ◽  
Experimental And Theoretical Studies

The charge storage mechanism and reaction kinetics enhancement of an oxygen-deficient vanadium oxide@N-doped carbon heterostructure were elucidated by experimental and theoretical studies.

Co2P nanoparticles encapsulated in 3D porous N-doped carbon nanosheet networks as an anode for high-performance sodium-ion batteries

2018 ◽  
Vol 6 (5) ◽  
pp. 2139-2147 ◽  
Author(s):  
Dan Zhou ◽  
Li-Zhen Fan
Keyword(s):  
High Performance ◽  
Specific Capacity ◽  
Rate Capability ◽  
Cobalt Nitrate ◽  
Cycling Stability ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
High Specific Capacity

A novel Co2P-3D PNC composite with Co2P NPs encapsulated in 3D porous N-doped carbon nanosheet networks was synthesized by a cobalt nitrate-induced PVP-blowing method combined with an in situ phosphidation process. The resultant Co2P-3D PNC anode delivers high specific capacity, enhanced rate capability, and improved cycling stability.

scholarly journals Borophosphene as a promising Dirac anode with large capacity and high-rate capability for sodium-ion batteries

2020 ◽  
Vol 22 (36) ◽  
pp. 20851-20857 ◽  
Author(s):  
Yang Zhang ◽  
Er-Hu Zhang ◽  
Ming-Gang Xia ◽  
Sheng-Li Zhang
Keyword(s):  
Anode Material ◽  
Energy Barrier ◽  
Specific Capacity ◽  
Rate Capability ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
High Rate Capability ◽  
Excellent Performance ◽  
Large Capacity

Borophosphene can be used as a promising Dirac anode material for SIBs with excellent performance including a large specific capacity, a low diffusion energy barrier and favorable cyclability.

scholarly journals Effects of F-Doping on the Electrochemical Performance of Na2Ti3O7 as an Anode for Sodium-Ion Batteries

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2206 ◽  
Author(s):  
Zehua Chen ◽  
Liang Lu ◽  
Yu Gao ◽  
Qixiang Zhang ◽  
Chuanxiang Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electrochemical Performance ◽  
Specific Capacity ◽  
Rate Capability ◽  
Cycling Performance ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Ion Diffusion ◽  
X Ray Diffraction ◽  
Phase Crystal

The effects of fluorine (F) doping on the phase, crystal structure, and electrochemical performance of Na2Ti3O7 are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements. F-doping does not change the crystal structure of NTO, although it has an effect on the morphology of the resultant product. As an anode material for sodium-ion batteries, the specific capacity of Na2Ti3O7 exhibits a 30% increase with F-doping owing to the improved sodium ion diffusion coefficient. F-doped Na2Ti3O7 also displays an enhanced rate capability and favourable cycling performance for more than 800 cycles.

scholarly journals Nitrogen-doped TiO2(B) nanorods as high-performance anode materials for rechargeable sodium-ion batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (18) ◽  
pp. 10885-10890 ◽  
Author(s):  
Yingchang Yang ◽  
Shijia Liao ◽  
Wei Shi ◽  
Yundong Wu ◽  
Renhui Zhang ◽  
...  
Keyword(s):  
Anode Materials ◽  
High Performance ◽  
Specific Capacity ◽  
Rate Capability ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
High Specific Capacity ◽  
Doped Tio2 ◽  
Nitrogen Doped ◽  
Good Cycling Stability

Nitrogen-doped TiO2(B) nanorods exhibit high specific capacity, good cycling stability and enhanced rate capability when utilized in sodium-ion batteries.

scholarly journals Plasma Enabled Fe2O3/Fe3O4 Nano-aggregates Anchored on Nitrogen-doped Graphene as Anode for Sodium-Ion Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 782 ◽  
Author(s):  
Qianqian Wang ◽  
Yujie Ma ◽  
Li Liu ◽  
Shuyue Yao ◽  
Wenjie Wu ◽  
...  
Keyword(s):  
Structural Integrity ◽  
Microwave Plasma ◽  
Specific Capacity ◽  
Rate Capability ◽  
Cycling Performance ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Low electrical conductivity severely limits the application of Fe2O3 in lithium- and sodium-ion batteries. In respect of this, we design and fabricate Fe2O3/Fe3O4 nano-aggregates anchored on nitrogen-doped graphene as an anode for sodium-ion batteries with the assistance of microwave plasma. The highly conductive Fe3O4 in the composite can function as a highway of electron transport, and the voids and phase boundaries in the Fe2O3/Fe3O4 heterostructure facilitate Na+ ion diffusion into the nano-aggregates. Furthermore, the Fe–O–C bonds between the nano-aggregates and graphene not only stabilize the structural integrity, but also enhance the charge transfer. Consequently, the Fe2O3/Fe3O4/NG anode exhibits specific capacity up to 362 mAh g−1 at 100 mA g−1, excellent rate capability, and stable long-term cycling performance. This multi-component-based heterostructure design can be used in anode materials for lithium- and sodium-ion batteries, and potential opens a new path for energy storage electrodes.

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