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.

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.

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.

scholarly journals Density functional studies of olivine-type LiFePO4 and NaFePO4 as positive electrode materials for rechargeable lithium and sodium ion batteries

2016 ◽  
Vol 286 ◽  
pp. 40-44 ◽  
Author(s):  
Masanobu Nakayama ◽  
Shohei Yamada ◽  
Randy Jalem ◽  
Toshihiro Kasuga
Keyword(s):  
Density Functional ◽  
Electrode Materials ◽  
Positive Electrode ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Functional Studies ◽  
Positive Electrode Materials

Flexible α-Fe2O3 nanorod electrode materials for sodium-ion batteries with excellent cycle performance

2018 ◽  
Vol 11 (06) ◽  
pp. 1840002 ◽  
Author(s):  
Depeng Zhao ◽  
Di Xie ◽  
Hengqi Liu ◽  
Fang Hu ◽  
Xiang Wu
Keyword(s):  
Electrochemical Performance ◽  
Flexible Electronics ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Rechargeable Batteries ◽  
Sodium Ion ◽  
Cycle Performance ◽  
Carbon Cloth ◽  
Sodium Ion Batteries ◽  
Performance Measurements

With the rise of flexible electronics, flexible rechargeable batteries have attracted widespread attention as a promising power source in new generation flexible electronic devices. In this work, [Formula: see text]-Fe2O3 nanorods grown on carbon cloth have been synthesized through a facile hydrothermal method as binder-free electrode material. The electrochemical performance measurements show that [Formula: see text]-Fe2O3 nanorods possess high specific capacitance and specific capacity retention of 119% after 100 cycles. The combination of low-cost and excellent electrochemical performance makes [Formula: see text]-Fe2O3 nanorods promising anode materials for sodium-ion batteries.

Layered-tunnel structured cathode for high performance sodium-ion batteries

2020 ◽  
Vol 13 (04) ◽  
pp. 2051016 ◽  
Author(s):  
Feng Zan ◽  
Yao Yao ◽  
Serguei V. Savilov ◽  
Eugenia Suslova ◽  
Hui Xia
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Rate Capability ◽  
High Energy ◽  
Structure Design ◽  
Sodium Ion ◽  
High Rate ◽  
High Energy Density ◽  
Diffraction Field ◽  
Sodium Ion Batteries

Sodium-ion batteries (SIBs) are promising candidates for large-scale energy storage applications. High-performance cathode material with high-energy density and long cycle life is of great interest. Here, an F-doped Nax[Formula: see text]Fy with layered-tunnel intergrowth structure is synthesized by a facile solid-state reaction method. The microstructure and composition of prepared material was confirmed by X-ray diffraction, field emission scanning electron microscope and transmission electron microscopy. The aim of the structure design is to combine the complementary features of high capacity from P2 phase and excellent structural stability from tunnel phase, as well as to improve rate performance by F doping. When investigated as high-rate and long-life cathode materials for Na-ion batteries, the layered-tunnel intergrowth structure exhibits synergistic effect including high discharge capacity (194.0[Formula: see text]mAh[Formula: see text][Formula: see text]), good rate capability (86[Formula: see text]mAh[Formula: see text][Formula: see text] at 15 C) as well as good cycling stability (81.2% capacity retention after 100 cycles). The as-prepared layered-tunnel intergrowth Nax[Formula: see text]Fy provides new insight into the development of intergrowth electrode materials and their application in rechargeable SIBs.

scholarly journals Theoretical study of electrode materials for sodium ion batteries based on Graphether/Graphene heterostructure

2021 ◽  
Vol 233 ◽  
pp. 01084
Author(s):  
Lei Li ◽  
Chun-Sheng Liu
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Electrode Materials ◽  
Theoretical Study ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Functional Theory ◽  
Sodium Batteries ◽  
Calculation Results ◽  
Vdw Heterostructure

The graphether/graphene vdW heterostructure has been systematically studied as an electrode material for sodium batteries based on density functional theory. We predict that the graphether/graphene heterostructure exhibits low diffusion barrier and large capacity. All these calculation results suggest that the graphether/graphene heterostructure can be used as a future commercial anode material for sodium ion batteries.

High rate capability and superior cycle stability of a flower-like Sb2S3anode for high-capacity sodium ion batteries

Nanoscale ◽  
2015 ◽  
Vol 7 (7) ◽  
pp. 3309-3315 ◽  
Author(s):  
Yaoyao Zhu ◽  
Ping Nie ◽  
Laifa Shen ◽  
Shengyang Dong ◽  
Qi Sheng ◽  
...  
Keyword(s):  
Electrode Materials ◽  
High Capacity ◽  
Rate Capability ◽  
Sodium Ion ◽  
High Rate ◽  
Sodium Ion Batteries ◽  
Cycle Stability ◽  
High Rate Capability ◽  
Self Assembled

Sb2S3nanosheets self-assembled into flower-like structures showed a high rate capability and superior cyclability when used as electrode materials for Na ion batteries.

Microtubular Hard Carbon Derived From Willow Catkins as an Anode Material With Enhanced Performance for Sodium-Ion Batteries

2018 ◽  
Vol 15 (4) ◽  
Author(s):  
Yongqiang Teng ◽  
Maosong Mo ◽  
Yuan Li
Keyword(s):  
Anode Material ◽  
Electrode Materials ◽  
Economic Value ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Hard Carbon ◽  
N Doping

As a kind of common bio-waste, willow catkin is of no economic value. But it is surprising that it can be an ideal carbonaceous source and bio-template for electrode materials of lithium-ion batteries and supercapacitors. Herein, we demonstrate that microtubular hard carbon can be derived from willow catkins and used as an anode of sodium-ion batteries (SIBs). The sample obtained from carbonization at 1000 °C delivers a high reversible capacity of 210 mAh g−1, good rate capability, and excellent cycling stability (112 mAh g−1 at 1000 mA g−1 after 1600 cycles) due to its unique tubular structure and the N-doping characteristic. The present work affords a new candidate for the production of hard carbon materials with tubular microstructure using natural biomass, and develops a highly promising anode material for SIBs.

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