scholarly journals Platinum‐Induced Pseudo‐Zn‐Air Reaction Massively Increases the Electrochemical Capacity of Aqueous Zn/V 5 O 12 ·6H 2 O Batteries

2020 ◽  
Author(s):  
Gongzheng Yang ◽  
Chengxin Wang
Keyword(s):  
Electrochemical Capacity

Synthesis and Electrochemical Capacity of MnO2/SMWCNT/PANI Ternary Composites

2013 ◽  
Vol 28 (8) ◽  
pp. 825-830
Author(s):  
Xing-Zhong XIAO ◽  
Qing-Feng YI
Keyword(s):  
Electrochemical Capacity

Enhanced ionic conductivity and electrochemical capacity of lithium ion battery based on PVDF-HFP/HDPE membrane

2016 ◽  
Vol 170 ◽  
pp. 126-129 ◽  
Author(s):  
Junying He ◽  
Jiuqing Liu ◽  
Jie Li ◽  
Yanqing Lai ◽  
Xiufeng Wu
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Battery ◽  
Lithium Ion ◽  
Electrochemical Capacity

Iron Phosphates as Cathodes of Lithium-Ion Batteries

2006 ◽  
Vol 973 ◽  
Author(s):  
Shijun Wang ◽  
M. Stanley Whittingham
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Low Cost ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Environmentally Benign ◽  
Iron Phosphates ◽  
Electrochemical Capacity ◽  
High Theoretical Capacity ◽  
Olivine Structure

ABSTRACTThis study focusses on optimizing the parameters of the hydrothermal synthesis to produce iron phosphates for lithium ion batteries, with an emphasis on pure LiFePO4 with the olivine structure and compounds containing a higher iron:phosphate ratio. Lithium iron phosphate (LiFePO4) is a promising cathode candidate for lithium ion batteries due to its high theoretical capacity, environmentally benign and the low cost of starting materials. Well crystallized LiFePO4 can be successfully synthesized at temperatures above 150 °C. The addition of a reducing agent, such as hydrazine, is essential to minimize the oxidation of ferrous (Fe2+) to ferric (Fe3+) in the final compound. The morphology of LiFePO4 is highly dependent on the pH of the initial solution. This study also investigated the lipscombite iron phosphates of formula Fe1.33PO4OH. This compound has a log-like structure formed by Fe-O octahedral chains. The chains are partially occupied by the Fe3+ sites, and these iron atoms and some of the vacancies can be substituted by other cations. Most of the protons can be ion-exchanged for lithium, and the electrochemical capacity is much increased.

Template Orienting One-Dimensional Schiff-Base Polymer: towards Flexible Nitrogen-enriched Carbonaceous Electrodes with Ultrahigh Electrochemical Capacity

Nanoscale ◽  
2021 ◽  
Author(s):  
Zhichang Xiao ◽  
Junwei Han ◽  
Haiyong He ◽  
Xinghao Zhang ◽  
Jing Xiao ◽  
...  
Keyword(s):  
Schiff Base ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
High Power Density ◽  
Energy Storage Devices ◽  
One Dimensional ◽  
Storage Devices ◽  
Electrochemical Capacity ◽  
Base Polymer

Lithium-ion capacitors (LICs) have attracted much attention considering their efficient combination of high energy density and high-power density. However, to meet the increasing requirements of energy storage devices and the...

Study of reversibility of electrolytic tin powder obtained from ionic liquid

2020 ◽  
Vol 11 ◽  
pp. 52-58
Author(s):  
M. S. Lipkin ◽  
◽  
N. I. Yalyushev ◽  
V. M. Lipkin ◽  
M. A. Burakov ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Intermetallic Compound ◽  
Impedance Spectroscopy ◽  
Anode Material ◽  
Choline Chloride ◽  
High Capacity ◽  
Lithium Ion ◽  
Electrochemical Analysis ◽  
Highly Dispersed ◽  
Electrochemical Capacity

In this paper, a promising new high-capacity anode material for lithium-ion batteries based on a highly dispersed search is considered. The powder was obtained using pulsed electrochemical cathodic reduction in an electrolyte from an ionic liquid choline chloride-ethylene glycol on a titanium vibrocathode. The discharge capacity of the anode material was 817 (mA·h)/g, which is close to the theoretically specific electrochemical capacity of tin 924 (mA·h)/g. The powder of the researchers for the dispersion and morphology of tin crystals. The particle size distribution of the particles with an increased fraction ratio of less than 0.1 μm and SEM-photographs of grains with a rhombohedral particle shape are presented. For research, we turned to this anode material the applied methods of electrochemical analysis: cyclic voltammetry, galvanostatic cycling and impedance spectroscopy in the process of charge and discharge of the electrode. Consideration of changes in the characteristics of the electrode under study using circuits for impedance spectroscopy during the formation of the lithium-tin intermetallic compound, as well as a change in the ratio It is shown that when the charging capacity is reached, close to theoretical intercalation can go through two ways: through SEI and intermetallic compound.

scholarly journals Atomistic Modeling of Various Doped Mg2NiH4 as Conversion Electrode Materials for Lithium Storage

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 254 ◽  
Author(s):  
Zhao Qian ◽  
Guanzhong Jiang ◽  
Yingying Ren ◽  
Xi Nie ◽  
Rajeev Ahuja
Keyword(s):  
Density Functional ◽  
Electrode Materials ◽  
Electronic Conductivity ◽  
Specific Capacity ◽  
Density Functional Theory Calculations ◽  
Lithium Storage ◽  
Pure Material ◽  
Computational Screening ◽  
Electrochemical Capacity ◽  
Ti Doping

In this work, we have compared the potential applications of nine different elements doped Mg2NiH4 as conversion-type electrode materials in Li-ion batteries by means of state-of-the-art Density functional theory calculations. The electrochemical properties, such as specific capacity, volume change and average voltage, as well as the atomic and electronic structures of different doped systems have been investigated. The Na doping can improve the electrochemical capacity of the pristine material. Si and Ti doping can reduce the band gap and benefit the electronic conductivity of electrode materials. All of the nine doping elements can help to reduce the average voltage of negative electrodes and lead to reasonable volume changes. According to the computational screening, the Na, Si and Ti doping elements are thought to be promising to enhance the comprehensive properties of pure material. This theoretical study is proposed to encourage and expedite the development of metal-hydrides based lithium-storage materials.

Characterization of Electrochemical Capacity of a Biotemplated Polypyrrole Membrane

2013 ◽  
Author(s):  
Robert G. Northcutt ◽  
Vishnu-Baba Sundaresan
Keyword(s):  
Surface Area ◽  
Conducting Polymer ◽  
Three Dimensional ◽  
Fatigue Loading ◽  
Dimensional Structure ◽  
Polymer Backbone ◽  
Volumetric Expansion ◽  
Interfacial Surface ◽  
Electrochemical Capacity ◽  
Polymer Electrodes

Recent studies of polypyrrole (PPy) electrodes have been increasing the interfacial surface area in order to increase electrochemical performance. We present a novel method of electropolymerizing PPy doped with dodecylbenzenesulfonate (DBS) referred to as biotemplating. A biotemplated conducting polymer utilizes phospholipid vesicles in order to form a three dimensional structure with a sponge-like shape. The vesicles, measuring 1–2 μm in diameter, are added in situ with the polymerization solution. They become enveloped while maintaining their structure during electropolymerization of PPy(DBS). The result of this structure is a significant increase in surface area compared to current techniques. There are several advantages in using biotemplated conducting polymers as battery electrodes. Compared to a planar PPy(DBS) membrane, biotemplated PPy(DBS) membranes have a roughly 50% increased storage capacity. There is an expected reduction in volumetric expansion during ion ingress/egress into the polymer backbone. This reduction would result in decreased fatigue loading and improving cyclability. Further, biotemplated PPy(DBS) membranes can be fabricated into thin structures with increased flexibility, allowing them to be rolled into various packaging sizes. In this article, the charge density of a biotemplated PPy(DBS) membrane as a function of charging and discharging currents is compared to a planar PPy(DBS) membrane. The structural enhancement offers systemic advantages by providing higher volumetric energy density and decreased fatigue loading for applications involving conducting polymer electrodes.

High-Temperature Characteristics of Melt-Spun Hydrogen Storage Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 2505-2508
Author(s):  
Rong Li ◽  
Jianmin Wu ◽  
Yan Qi ◽  
Shaoxiong Zhou
Keyword(s):  
High Temperature ◽  
Hydrogen Storage ◽  
Hydrogen Evolution ◽  
Discharge Capacity ◽  
Hydrogen Storage Alloys ◽  
Temperature Characteristics ◽  
Hydride Formation ◽  
Melt Spun ◽  
Electrochemical Capacity ◽  
Melt Spun Ribbons

In this work, the electrochemical discharge capacity of melt-spun (MmY)1 (NiCoMnAl)5 ribbons, in which the content of yttrium was 0-2.5wt%, was studied in the temperature range of 30~80oC. It was found that adding element yttrium made the electrochemical capacity of the compounds increased. The capacity obtained was 333mAh/g at 30 oC and 247 mAh/g at 80oC when the content of yttrium was 2.0wt%. In addition, 70~85% recovery of the capacity was obtained due to better antioxidation. The increase of charging/discharging efficiency with yttrium substitution for Mm in melt-spun ribbons illustrated by the potential characteristics of charging/discharging is ascribed to the flatter and lower hydride formation potential, as well as the higher hydrogen evolution potential. Moreover, This effect is more prominent with increasing yttrium content.

scholarly journals Electrochemical capacity fading of polyaniline electrode in supercapacitor: An XPS analysis

2017 ◽  
Vol 27 (2) ◽  
pp. 257-260 ◽  
Author(s):  
Jinxing Deng ◽  
Tingmei Wang ◽  
Jinshan Guo ◽  
Peng Liu
Keyword(s):  
Xps Analysis ◽  
Capacity Fading ◽  
Electrochemical Capacity

Effects of measurement factor on electrochemical capacity of some hydrogen storage alloys

1995 ◽  
Vol 30 (1) ◽  
pp. 19-22 ◽  
Author(s):  
Da-lin Sun ◽  
Jian-Jun Jiang ◽  
Yong-quan Lei ◽  
Wei-dong Liu ◽  
Jing Wu ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Alloys ◽  
Electrochemical Capacity
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