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 Understanding sodium-ion diffusion in layered P2 and P3 oxides via experiments and first-principles calculations: a bridge between crystal structure and electrochemical performance

2016 ◽  
Vol 8 (4) ◽  
pp. e266-e266 ◽  
Author(s):  
Shaohua Guo ◽  
Yang Sun ◽  
Jin Yi ◽  
Kai Zhu ◽  
Pan Liu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electrochemical Performance ◽  
Density Functional ◽  
Electrode Materials ◽  
Rate Capability ◽  
Sodium Ion ◽  
Atomic Scale ◽  
Sodium Ion Batteries ◽  
P Type ◽  
The Relationship

Abstract Layered Na x MeO2 (Me=transition metal) oxides, the most common electrode materials for sodium-ion batteries, fall into different phases according to their stacking sequences. Although the crystalline phase is well known to largely influence the electrochemical performance of these materials, the structure–property relationship is still not fully experimentally and theoretically understood. Herein, a couple consisting of P2-Na0.62Ti0.37Cr0.63O2 and P3-Na0.63Ti0.37Cr0.63O2 materials having nearly the same compositions is reported. The atomic crystal structures and charge compensation mechanism are confirmed by atomic-scale characterizations in the layered P2 and P3 structures, respectively, and notably, the relationship of the crystal structure–electrochemical performance is well defined in the layered P-type structures for the first time in this paper. The electrochemical results suggest that the P2 phase exhibits a better rate capability and cycling stability than the P3 phase. Density functional theory calculations combined with a galvanostatic intermittent titration technique indicates that the P2 phase shows a lower Na diffusion barrier in the presence of multi-Na vacancies, accounting for the better rate capability of the P2 phase. Our results reveal the relationship between the crystal structure and the electrochemical properties in P-type layered sodium oxides, demonstrating the potential for future electrode advancements for applications in sodium-ion batteries.

Removing structural water from sodium titanate anodes towards barrier-free ion diffusion for sodium ion batteries

2017 ◽  
Vol 5 (35) ◽  
pp. 18691-18697 ◽  
Author(s):  
Qing Zhang ◽  
Tianqi Zhang ◽  
Yaqing Wei ◽  
Tianyou Zhai ◽  
Huiqiao Li
Keyword(s):  
Rate Capability ◽  
Sodium Titanate ◽  
Cycling Performance ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Ion Diffusion ◽  
Structural Water ◽  
Free Ion ◽  
Barrier Free

The dehydrated sample exhibits a better rate capability and enhanced cycling performance, suggesting that the existence of layered water in sodium titanate is unfavourable for the sodium ion diffusion in TiO6 octahedral layers.

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.

scholarly journals Effect of Hematite Doping with Aliovalent Impurities on the Electrochemical Performance of α-Fe2O3@rGO-Based Anodes in Sodium-Ion Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1588
Author(s):  
Vincenza Modafferi ◽  
Claudia Triolo ◽  
Michele Fiore ◽  
Alessandra Palella ◽  
Lorenzo Spadaro ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Rate Capability ◽  
Sodium Ion ◽  
Oxide Content ◽  
Sodium Ion Batteries ◽  
Reduced Graphene ◽  
One Step ◽  
Ti Doping

The effect of the type of dopant (titanium and manganese) and of the reduced graphene oxide content (rGO, 30 or 50 wt %) of the α-Fe2O3@rGO nanocomposites on their microstructural properties and electrochemical performance was investigated. Nanostructured composites were synthesized by a simple one-step solvothermal method and evaluated as anode materials for sodium ion batteries. The doping does not influence the crystalline phase and morphology of the iron oxide nanoparticles, but remarkably increases stability and Coulombic efficiency with respect to the anode based on the composite α-Fe2O3@rGO. For fixed rGO content, Ti-doping improves the rate capability at lower rates, whereas Mn-doping enhances the electrode stability at higher rates, retaining a specific capacity of 56 mAhg−1 at a rate of 2C. Nanocomposites with higher rGO content exhibit better electrochemical performance.

In situ hydrothermal synthesis of double-carbon enhanced novel cobalt germanium hydroxide composites as promising anode material for sodium ion batteries

2021 ◽  
Author(s):  
Ni Wen ◽  
Siyuan Chen ◽  
Jingjie Feng ◽  
Ke Zhang ◽  
Zhiyong Zhou ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Anode Material ◽  
Rate Capability ◽  
Cycling Performance ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
High Rate Capability

The double-carbon confined CGH@C/rGO composite is designed via a facile in situ hydrothermal strategy. When used as an anode for sodium-ion batteries, it exhibits superior reversible capacities, high rate capability, and stable cycling performance.

Carbon-coated Li4Ti5O12 nanoparticles with high electrochemical performance as anode material in sodium-ion batteries

2017 ◽  
Vol 5 (22) ◽  
pp. 10902-10908 ◽  
Author(s):  
Yao Liu ◽  
Jingyuan Liu ◽  
Mengyan Hou ◽  
Long Fan ◽  
Yonggang Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Anode Material ◽  
Rate Capability ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Cycle Stability ◽  
High Discharge ◽  
Sodium Batteries ◽  
Carbon Coated

Carbon-coated Li4Ti5O12 nanoparticles show promising electrochemical performance with high discharge specific capacities, remarkable cycle stability and outstanding rate capability as anode material in rechargeable sodium batteries.

Uniform yolk–shell Sn4P3@C nanospheres as high-capacity and cycle-stable anode materials for sodium-ion batteries

2015 ◽  
Vol 8 (12) ◽  
pp. 3531-3538 ◽  
Author(s):  
Jun Liu ◽  
Peter Kopold ◽  
Chao Wu ◽  
Peter A. van Aken ◽  
Joachim Maier ◽  
...  
Keyword(s):  
Anode Materials ◽  
High Capacity ◽  
Rate Capability ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
High Reversible Capacity ◽  
Very High

Uniform yolk–shell Sn4P3@C nanospheres exhibit very high reversible capacity, superior rate capability and stable cycling performance for Na-ion batteries.

scholarly journals Hard Carbon Derived from Avocado Peels as a High-Capacity, High-Performance Anode Material for Sodium-Ion Batteries

2021 ◽  
Author(s):  
Francielli Genier ◽  
Shreyas Pathreeker ◽  
Robson Schuarca ◽  
Mohammad Islam ◽  
Ian Hosein
Keyword(s):  
High Performance ◽  
High Capacity ◽  
Rate Capability ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Hard Carbon ◽  
Storage Technologies ◽  
Carbon Based

Deriving battery grade materials from natural sources is a key element to establishing sustainable energy storage technologies. In this work, we present the use of avocado peels as a sustainable source for conversion into hard carbon based anodes for sodium ion batteries. The avocado peels are simply washed and dried then proceeded to a high temperature conversion step. Materials characterization reveals conversion of the avocado peels in high purity, highly porous hard carbon powders. When prepared as anode materials they show to the capability to reversibly store and release sodium ions. The hard carbon-based electrodes exhibit excellent cycling performance, namely, a reversible capacity of 352.55 mAh/g at 0.05 A/g, rate capability up to 86 mAh/g at 3500 mA/g, capacity retention of >90%, and 99.9% coulombic efficiencies after 500 cycles. This study demonstrates avocado derived hard carbon as a sustainable source that can provide excellent electrochemical and battery performance as anodes in sodium ion batteries.

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