Tuning the electronic energy level of covalent organic frameworks for crafting high-rate Na-ion battery anode

2020 ◽  
Vol 5 (8) ◽  
pp. 1264-1273
Author(s):  
Sattwick Haldar ◽  
Dhananjayan Kaleeswaran ◽  
Deepak Rase ◽  
Kingshuk Roy ◽  
Satishchandra Ogale ◽  
...  
Keyword(s):  
Energy Level ◽  
Electronic Energy ◽  
High Rate ◽  
Covalent Organic Frameworks ◽  
Rate Performance ◽  
Electron Accumulation ◽  
Electronic Energy Level ◽  
Battery Anode

Lowering the LUMO levels of an anodic COF through the incorporation of N-rich modules favors electron accumulation on it, which sets up an electronic drive for the Na+ ions to enter the anode from the electrolyte. The optimal framework⋯Na+ interactions delivers excellent rate-performance.

Solution-Combustion Synthesized Nanocrystalline Li4Ti5O12As High-Rate Performance Li-Ion Battery Anode

2010 ◽  
Vol 22 (9) ◽  
pp. 2857-2863 ◽  
Author(s):  
A. S. Prakash ◽  
P. Manikandan ◽  
K. Ramesha ◽  
M. Sathiya ◽  
J-M. Tarascon ◽  
...  
Keyword(s):  
High Rate ◽  
Rate Performance ◽  
Li Ion Battery ◽  
Solution Combustion ◽  
Li Ion ◽  
High Rate Performance ◽  
Battery Anode

Facile formation of a nanostructured NiP2@C material for advanced lithium-ion battery anode using adsorption property of metal–organic framework

2016 ◽  
Vol 4 (24) ◽  
pp. 9593-9599 ◽  
Author(s):  
Gaihua Li ◽  
Hao Yang ◽  
Fengcai Li ◽  
Jia Du ◽  
Wei Shi ◽  
...  
Keyword(s):  
Adsorption Property ◽  
Metal Organic Framework ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Rate ◽  
Rate Performance ◽  
Lithium Storage ◽  
Metal Organic ◽  
High Rate Performance ◽  
Battery Anode

Utilizing the adsorption properties of MOFs, a nanostructured NiP2@C was successfully synthesized, which exhibited enhanced capability for lithium storage in terms of both the reversible specific capacity and high-rate performance.

scholarly journals A simplified method for calculating spectral emission of nonequilibrium air plasmas in hypersonic shock-layers

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Xin He ◽  
Cheng Gao ◽  
Tao Jiang
Keyword(s):  
Energy Level ◽  
Electronic Energy ◽  
Air Plasma ◽  
Spectral Emission ◽  
Radiative Processes ◽  
Air Plasmas ◽  
Significant Difference ◽  
Simplified Method ◽  
Electronic Energy Level ◽  
Hypersonic Shock

AbstractA simplified method for calculating the spectral emission of nonequilibrium air plasmas is developed. In order to obtain the nonequilibrium energy level populations, the nonequilibrium coefficients are introduced into the Saha-Boltzmann equation. These nonequilibrium coefficients are calculated by using several significant radiative processes. An approach to the determination of nonequilibrium electronic energy level populations of diatomic molecules is also presented. Based on the method, spectral emission of atoms and molecules in a typical air plasma cell is investigated. The results reveal that there is a significant difference between the nonequilibrium and equilibrium emission. We apply the method to the nonequilibrium AVCO R-156 experiment. Good agreement with the NEQAIR code and the measured data is shown, indicating that the method is reasonable and has good accuracy.

scholarly journals Nitrogen-rich covalent organic frameworks with multiple carbonyls for high-performance sodium batteries

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ruijuan Shi ◽  
Luojia Liu ◽  
Yong Lu ◽  
Chenchen Wang ◽  
Yixin Li ◽  
...  
Keyword(s):  
High Performance ◽  
Density Functional ◽  
Specific Capacity ◽  
Density Functional Theory Calculations ◽  
Rechargeable Batteries ◽  
High Rate ◽  
Ex Situ ◽  
Covalent Organic Frameworks ◽  
Rate Performance ◽  
Practical Applications

AbstractCovalent organic frameworks with designable periodic skeletons and ordered nanopores have attracted increasing attention as promising cathode materials for rechargeable batteries. However, the reported cathodes are plagued by limited capacity and unsatisfying rate performance. Here we report a honeycomb-like nitrogen-rich covalent organic framework with multiple carbonyls. The sodium storage ability of pyrazines and carbonyls and the up-to twelve sodium-ion redox chemistry mechanism for each repetitive unit have been demonstrated by in/ex-situ Fourier transform infrared spectra and density functional theory calculations. The insoluble electrode exhibits a remarkably high specific capacity of 452.0 mAh g−1, excellent cycling stability (~96% capacity retention after 1000 cycles) and high rate performance (134.3 mAh g−1 at 10.0 A g−1). Furthermore, a pouch-type battery is assembled, displaying the gravimetric and volumetric energy density of 101.1 Wh kg−1cell and 78.5 Wh L−1cell, respectively, indicating potentially practical applications of conjugated polymers in rechargeable batteries.

Hollow carbon nanofiber as a stabilizer for in situ TiO2/VO2 co-impregnation with high rate performance and ultra-long cycling life as lithium-ion battery anode

2014 ◽  
Vol 2 (33) ◽  
pp. 13232-13236 ◽  
Author(s):  
Xinran Wang ◽  
Shili Zheng ◽  
Shaona Wang ◽  
Yi Zhang ◽  
Hao Du
Keyword(s):  
Carbon Nanofiber ◽  
Lithium Ion ◽  
High Rate ◽  
Rate Performance ◽  
Power Rate ◽  
Hollow Carbon ◽  
High Rate Performance ◽  
Cycling Life ◽  
Battery Anode

High anodic power rate and ultra-long cycling stability were achieved by co-encapsulation of TiO2/VO2 into hollow carbon nanofibers.

A solid reaction towards in situ hybridization of carbon dots and conjugated polymers for enhanced light absorption and conversion

2017 ◽  
Vol 53 (68) ◽  
pp. 9426-9429 ◽  
Author(s):  
Shengliang Hu ◽  
Yufeng Zhou ◽  
Chaorui Xue ◽  
Jinlong Yang ◽  
Qing Chang
Keyword(s):  
In Situ Hybridization ◽  
Energy Level ◽  
Conjugated Polymers ◽  
Carbon Dots ◽  
Level Structure ◽  
Electronic Energy ◽  
Solid Reaction ◽  
Energy Level Structure ◽  
Electronic Energy Level

The incorporation of carbon dots into poly(diphenylbutadiyne) nanostructures induces the change of the electronic energy level structure and enhances photocatalytic performances.

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