scholarly journals Nanoconfined growth of lithium-peroxide inside electrode pores: A noncatalytic strategy toward mitigating capacity-rechargeability trade-off in Lithium–Air battery

2021 ◽  
Author(s):  
Arghya Dutta ◽  
Kimihiko Ito ◽  
Yoshimi Kubo
Keyword(s):  
Discharge Capacity ◽  
Practical Realization ◽  
Trade Off ◽  
Lithium Peroxide ◽  
Air Battery

Capacity-rechargeability trade-off in Lithium–Air battery remains as one of the major challenges before its practical realization. As the discharge capacity increases, an uncontrolled growth of lithium-peroxide leads to passivation of...

Sago Gel Polymer Electrolyte for Zinc-Air Battery

2010 ◽  
Vol 72 ◽  
pp. 305-308 ◽  
Author(s):  
M.N. Masri ◽  
M.F.M. Nazeri ◽  
A.A. Mohamad
Keyword(s):  
Ionic Conductivity ◽  
Polymer Electrolyte ◽  
Discharge Capacity ◽  
Potassium Hydroxide ◽  
Gel Polymer Electrolyte ◽  
Practical Capacity ◽  
Air Battery

A sago-based gel polymer electrolyte (GPE) was prepared by mixing native sago with potassium hydroxide (KOH) aqueous in order to investigate the applicability of GPE to zinc-air (Zn-air) battery. The viscosity and conductivity of the sago GPE were evaluated using varying sago amounts and KOH concentrations. The viscosity of the sago GPE was kept as a reserve in the region of ~ 0.2 Pa s as the KOH concentration was increased from 2 to 8 M. Sago GPE was found to have an excellent ionic conductivity of (4.45  0.1) x 10-1 S cm-1 with 6 M KOH. GPE was also employed in an experimental Znair battery using porous Zn electrode as the anode. The battery shows outstanding discharge capacity and practical capacity obtained of 505 mA h g-1.

A Modeling Study of Discharging Li-O2 Batteries With Various Electrolyte Concentrations

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Fangzhou Wang ◽  
Xianglin Li ◽  
Xiaowen Hao ◽  
Jianyu Tan
Keyword(s):  
Mass Transfer ◽  
Discharge Capacity ◽  
Electrolyte Concentration ◽  
Tetraethylene Glycol ◽  
Isothermal Model ◽  
Discharge Performance ◽  
Cathode Electrode ◽  
Lithium Peroxide ◽  
Current Densities ◽  
O2 Supply

Abstract The mass transfer in the cathode electrode plays an important role in operating Li-O2 batteries. In this study, a two-dimensional, transient, and isothermal model is developed to investigate the mass transfer in discharging Li-O2 batteries. This model simulates the discharge performance of Li-O2 batteries with various electrolyte concentrations (0.1−1.0M) at various current densities (0.1, 0.3, and 0.5 mA/cm2). The O2 diffusivity and the ionic conductivity and diffusivity of Li+ are altered as the bis(trifluoromethane)sulfonimide lithium salt (LiTFSI) concentration in the electrolyte of tetraethylene glycol dimethyl ether (TEGDME) changes. The distributions of O2, Li+, and lithium peroxide (Li2O2) in the cathode electrode after discharge are calculated using this model. Modeling results show that when the concentration decreases from 0.5 to 0.25M, the discharge capacity of Li-O2 sharply drops at various current densities. The mass transfer of Li+ determines the discharge capacity of Li-O2 batteries with dilute electrolytes (≤0.25 M). In contrast, the O2 supply is dominant regarding the discharge capacity when the electrolyte concentration is larger than 0.5M. The highest discharge capacity (e.g., 6.09 mAh at 0.1 mA/cm2) is achieved using 0.5M electrolyte since it balances mass transfer of O2 and Li+.

Three Dimensional Single-Walled Carbon Nanotube Foams for Ultrahigh Energy Density Lithium Air Battery Cathodes

2015 ◽  
Author(s):  
Rachel Carter ◽  
Landon Oakes ◽  
Cary L. Pint
Keyword(s):  
Carbon Nanotubes ◽  
Energy Density ◽  
Discharge Capacity ◽  
Metal Foam ◽  
Functional Materials ◽  
Single Walled Carbon Nanotubes ◽  
Ultrahigh Energy ◽  
Single Walled Carbon ◽  
Air Battery ◽  
Walled Carbon Nanotubes

This paper highlights our progress in developing pristine single-walled carbon nanotubes (SWCNTs) into functional materials for lightweight, conductive cathodes in lithium air (Li-air) batteries. We outline a process to produce foams of single-walled carbon nanotubes using liquid processing routes that are free of additives or surfactants, using polar solvents and electrophoretic deposition. To accomplish this, SWCNTs are deposited onto sacrificial metal foam templates, and the metal foam is removed to yield a freestanding, all-SWCNT foam material. We couple this material into a cathode for a Li-air battery and demonstrate excellent performance that includes first discharge capacity over 8200 mAh/g, and specific energy density of ∼ 21.2 kWh/kg (carbon) and ∼ 3.3 kWh/kg (full cell). We further compare this to the performance of foams prepared with SWCNTs that are dispersed with surfactant, and our results indicate that surfactant residues completely inhibit the nucleation of stable lithium peroxide materials — a result measured across multiple devices. Comparing to multi-walled carbon nanotubes produced using the same technique indicates a discharge capacity of only ∼ 1500 mAh/g, which is over 5X lower than SWCNTs in the same processing technique and material architecture. Overall, this work highlights SWCNT materials in the absence of impurities introduced during experimental processing as a lightweight and high performance electrode material for lithium-air batteries.

Flexible aluminum//Fe/AQDS-doped PANI air battery with capacity self-restoring performance

2019 ◽  
Author(s):  
Huijun Cao
Keyword(s):  
Electrochemical Performance ◽  
Discharge Capacity ◽  
Disodium Salt ◽  
Gel Electrolyte ◽  
Disulfonic Acid ◽  
Air Electrode ◽  
Excellent Electrochemical Performance ◽  
Air Battery ◽  
Doped Polyaniline

The synergism between nitrate and triethanolamine (TEA) in the Al electrode activation was investigated in the NH4Cl electrolyte. Using the Fe(Ⅲ)/anthraquinone-2,6-disulfonic acid disodium salt-doped polyaniline (PANI/Fe/AQDS) cathode as the air electrode, Al as counter anode, a gel electrolyte of NH4Cl, TEA and NaNO3, a flexible and ultrathin air battery was prepared. The resulting Al//polyaniline battery exhibits excellent electrochemical performance, and it has a thickness of approximately 0.5 mm, a discharge plateau of 1.2 V, and a discharge capacity of 50 mAh·cm-2 and a considerable self-restoring capacity. So the battery has the feasibility to use as a disposable battery. (This preprint is for 235th ECS meeting in Dallas with poster type)

A Mathematical Model for Li-Air Battery Considering Volume Change Phenomena

2014 ◽  
Author(s):  
Kisoo Yoo ◽  
Prashanta Dutta ◽  
Soumik Banerjee
Keyword(s):  
Mathematical Model ◽  
Volume Change ◽  
Moving Boundary ◽  
Cell Voltage ◽  
Storage Device ◽  
Volume Changes ◽  
Voltage Drops ◽  
Lithium Peroxide ◽  
Air Battery ◽  
Volume Method

Li-air battery has the potential to be the next generation energy storage device because of its much higher energy density and power density. However, the development of Li-air battery has been hindered by a number of technical challenges such as passivation of cathode, change in effective reaction area, volume change during charge and discharge, etc. In a lithium-air cell, the volume change can take place due to Li metal oxidation in anode during charge as well as due to the solubility of reaction product (lithium peroxide) in the electrolyte at cathode. In this study, a mathematical model is developed to study the performance of lithium-air batteries considering the significant volume changes at the anode and cathode sides using moving boundary technique. A numerical method was introduced to solve moving boundary problem using finite volume method. Using this model, the electric performance of lithium-air battery is obtained for various load conditions. Numerical results indicate that cell voltage drops faster with increase in load which is consistent with experimental observations. Also, the volume changes significantly affect the electric performance of lithium-air cell.

Enhanced discharge capacity of Mg-air battery with addition of water dispersible nano MoS2 sheet in MgCl2 electrolyte

Ionics ◽  
2018 ◽  
Vol 25 (2) ◽  
pp. 583-592 ◽  
Author(s):  
Arunkumar Prabhakaran Shyma ◽  
Siva Palanisamy ◽  
Naveenkumar Rajendhran ◽  
Rajendran Venkatachalam
Keyword(s):  
Discharge Capacity ◽  
Water Dispersible ◽  
Air Battery
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