scholarly journals Tetramethylpyrazine: an electrolyte additive for high capacity and energy efficiency lithium–oxygen batteries

RSC Advances ◽  
2021 ◽  
Vol 11 (39) ◽  
pp. 24320-24325
Author(s):  
Mengyuan Song ◽  
Chunguang Chen ◽  
Tao Huang ◽  
Aishui Yu
Keyword(s):  
Energy Efficiency ◽  
Discharge Capacity ◽  
Strong Interaction ◽  
High Capacity ◽  
Electrolyte Additive ◽  
Lithium Oxygen Batteries ◽  
Solution Mechanism

TMP has a strong interaction with Li+, which promotes the solution mechanism of Li2O2, thereby increasing the discharge capacity.

Performance Optimization for Lithium–Oxygen Batteries

2012 ◽  
Vol 519 ◽  
pp. 160-163 ◽  
Author(s):  
Fang Wang ◽  
Da Liang Xu ◽  
Chun Sheng Liang ◽  
Hong Yuan Sun ◽  
Zhong Kuan Luo
Keyword(s):  
Discharge Capacity ◽  
Current Density ◽  
Performance Optimization ◽  
Cathode Surface ◽  
High Capacity ◽  
Argon Atmosphere ◽  
Pure Oxygen ◽  
Discharge Performance ◽  
Lithium Oxygen Batteries ◽  
Carbon Loading

Lithium–oxygen coin cells without catalyst were assembled in argon atmosphere and tested in pure oxygen. Results showed that the first discharge performance of the batteries was strongly affected by the carbon loading, electrolyte amount and current density. At the carbon loading (0.4 mg/cm2), the electrolyte amount (160 μL/cell) and the current density (0.05 mA/cm2), a high capacity of 4586.5 mAh/g was obtained. The capacity decreased when the carbon loading or current density was increased. And the capacity would have a decrease when the amount of electrolyte was decreased. The highest capacity of 6010.2 mAh/g was obtained by optimizing the combination of carbon loading and electrolyte amount at current density of 0.01mA/cm2. However, the discharge capacity sharply decreased from the second cycle. It may be partly due to the fact that the pores of cathode surface were blocked by discharge products at the end of discharge.

Perfluorinated organics regulating Li2O2 formation and improving stability for Li–oxygen batteries

2021 ◽  
Vol 57 (24) ◽  
pp. 3030-3033
Author(s):  
Yuling Wang ◽  
Fan Bai ◽  
Aiping Wang ◽  
Zhonghui Cui ◽  
Da Wang ◽  
...  
Keyword(s):  
High Capacity ◽  
Oxygen Solubility ◽  
Artificial Blood ◽  
Lithium Oxygen Batteries

Perfluorotributylamine, an artificial blood, is introduced into lithium–oxygen batteries due to its excellent oxygen solubility, achieving superior high capacity and long stability.

scholarly journals Realizing the Embedded Growth of Large Li2O2Aggregations by Matching Different Metal Oxides for High-Capacity and High-Rate Lithium Oxygen Batteries

2017 ◽  
Vol 4 (11) ◽  
pp. 1700172 ◽  
Author(s):  
Peng Zhang ◽  
Shoufeng Zhang ◽  
Mu He ◽  
Junwei Lang ◽  
Aimin Ren ◽  
...  
Keyword(s):  
Metal Oxides ◽  
High Capacity ◽  
High Rate ◽  
Lithium Oxygen Batteries

An inorganic–organic nanocomposite calix[4]quinone (C4Q)/CMK-3 as a cathode material for high-capacity sodium batteries

2017 ◽  
Vol 4 (11) ◽  
pp. 1806-1812 ◽  
Author(s):  
Shibing Zheng ◽  
Jinyan Hu ◽  
Weiwei Huang
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
High Capacity ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Initial Discharge ◽  
Sodium Batteries

A novel high-capacity cathode material C4Q/CMK-3 for SIBs shows an initial discharge capacity of 438 mA h g−1 and a capacity retention of 219.2 mA h g−1 after 50 cycles.

Tris(trimethylsilyl) phosphite (TMSPi) as an electrolyte additive for LiNi0.5Co0.2Mn0.3O2 cathode materials at elevated voltage and temperature

2021 ◽  
Author(s):  
Xiao Yu ◽  
Zhiyong Yu ◽  
Jishen Hao ◽  
Hanxing Liu
Keyword(s):  
Discharge Capacity ◽  
Cathode Materials ◽  
Solid Electrolyte Interphase ◽  
Rate Capability ◽  
Electrochemical Performances ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Electrolyte Additive ◽  
Interface Impedance ◽  
Initial Discharge

Electrolyte additive tris(trimethylsilyl) phosphite (TMSPi) was used to promote the electrochemical performances of LiNi[Formula: see text]Co[Formula: see text]Mn[Formula: see text]O2 (NCM523) at elevated voltage (4.5 V) and temperature (55[Formula: see text]C). The NCM523 in 2.0 wt.% TMSPi-added electrolyte exhibited a much higher capacity (166.8 mAh/g) than that in the baseline electrolyte (118.3 mAh/g) after 100 cycles under 4.5 V at 30[Formula: see text]C. Simultaneously, the NCM523 with 2.0 wt.% TMSPi showed superior rate capability compared to that without TMSPi. Besides, after 100 cycles at 55[Formula: see text]C under 4.5 V, the discharge capacity retention reached 87.4% for the cell with 2.0 wt.% TMSPi, however, only 24.4% of initial discharge capacity was left for the cell with the baseline electrolyte. A series of analyses (TEM, XPS and EIS) confirmed that TMSPi-derived solid electrolyte interphase (SEI) stabilized the electrode/electrolyte interface and hindered the increase of interface impedance, resulting in obviously enhanced electrochemical performances of NCM523 cathode materials under elevated voltage and/or temperature.

Configuration of gradient-porous ultrathin FeCo2S4 nanosheets vertically aligned on Ni foam as a noncarbonaceous freestanding oxygen electrode for lithium–oxygen batteries

Nanoscale ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 1864-1874 ◽  
Author(s):  
Zhiqian Hou ◽  
Chaozhu Shu ◽  
Peng Hei ◽  
Tingshuai Yang ◽  
Ruixin Zheng ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Oxygen Electrode ◽  
Commercial Application ◽  
Oxygen Species ◽  
Ni Foam ◽  
Oxygen Electrodes ◽  
Vertically Aligned ◽  
Lithium Oxygen Batteries

The degradation of oxygen electrodes caused by oxygen species in lithium–oxygen (Li–O2) batteries deteriorates their energy efficiency and cyclability and seriously hinders their commercial application.

scholarly journals Novel Resource Allocation Techniques for Downlink Non-Orthogonal Multiple Access Systems

2020 ◽  
Vol 10 (17) ◽  
pp. 5892 ◽  
Author(s):  
Zuhura J. Ali ◽  
Nor K. Noordin ◽  
Aduwati Sali ◽  
Fazirulhisyam Hashim ◽  
Mohammed Balfaqih
Keyword(s):  
Resource Allocation ◽  
Energy Efficiency ◽  
Power Allocation ◽  
Multiple Access ◽  
High Capacity ◽  
Kkt Conditions ◽  
Optimal Power Allocation ◽  
User Pairing ◽  
Optimal Power ◽  
Sum Rate

Non-orthogonal multiple access (NOMA) plays an important role in achieving high capacity for fifth-generation (5G) networks. Efficient resource allocation is vital for NOMA system performance to maximize the sum rate and energy efficiency. In this context, this paper proposes optimal solutions for user pairing and power allocation to maximize the system sum rate and energy efficiency performance. We identify the power allocation problem as a nonconvex constrained problem for energy efficiency maximization. The closed-form solutions are derived using Karush–Kuhn–Tucker (KKT) conditions for maximizing the system sum rate and the Dinkelbach (DKL) algorithm for maximizing system energy efficiency. Moreover, the Hungarian (HNG) algorithm is utilized for pairing two users with different channel condition circumstances. The results show that with 20 users, the sum rate of the proposed NOMA with optimal power allocation using KKT conditions and HNG (NOMA-PKKT-HNG) is 6.7% higher than that of NOMA with difference of convex programming (NOMA-DC). The energy efficiency with optimal power allocation using DKL and HNG (NOMA-PDKL-HNG) is 66% higher than when using NOMA-DC.

A RuO2 nanoparticle-decorated buckypaper cathode for non-aqueous lithium–oxygen batteries

2015 ◽  
Vol 3 (37) ◽  
pp. 19042-19049 ◽  
Author(s):  
P. Tan ◽  
W. Shyy ◽  
T. S. Zhao ◽  
X. B. Zhu ◽  
Z. H. Wei
Keyword(s):  
Energy Efficiency ◽  
Specific Capacity ◽  
High Energy ◽  
Current Collectors ◽  
Polymeric Binders ◽  
High Energy Efficiency ◽  
Lithium Oxygen Batteries ◽  
Additional Current

A RuO2 nanoparticle-decorated buckypaper cathode does not require additional current collectors and polymeric binders, offering promise for a high-practical specific capacity, high-energy efficiency, and stable electrode for non-aqueous lithium–oxygen batteries.

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