scholarly journals Performance optimization of freestanding MWCNT-LiFePO4 sheets as cathodes for improved specific capacity of lithium-ion batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (30) ◽  
pp. 16566-16573 ◽  
Author(s):  
Rahmat Agung Susantyoko ◽  
Tawaddod Saif Alkindi ◽  
Amarsingh Bhabu Kanagaraj ◽  
Boohyun An ◽  
Hamda Alshibli ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Performance Optimization ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Positive Electrode

We optimized the specific capacity of freestanding MWCNT-LiFePO4 positive electrode. We demonstrated as high (low) as 90 wt% LiFePO4 active material (10 wt% MWCNTs inactive material). This corresponded to a maximum specific capacity of 153 mA h g−1.

Investigating the Influence of Different Coating Surface Densities of Electrodes on Electrochemical Performance of Lithium-Ion Batteries

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Yanping Dang ◽  
Wangyu Liu ◽  
Weigui Xie ◽  
Weiping Qiu
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Surface Density ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Aluminum Foil ◽  
Coating Surface ◽  
Allowable Range ◽  
Polypropylene Separator

Abstract The anode and cathode pieces are vital components of lithium-ion batteries. The coating surface density of active material is a significant parameter involved during the fabrication of electrodes and has considerable impact on battery performance. In this paper, anode and cathode pieces are prepared with different surface densities within the allowable range. The anode and cathode pieces are first graded respectively and then matched up according to different surface density ranges. Afterward, the electrodes are assembled with commercial polypropylene separator in 18,650 cell case and infused with electrolyte. The cathode is constituted with a mixture of nickel cobalt manganese (NCM) ternary material and lithium manganese oxide coated on aluminum foil, while the anode is composed of graphite coated on copper foil. The electrochemical performance and safety properties were tested to investigate the influence of the coating surface density of electrodes and optimize the electrochemical performance by regulating the matching surface density of electrodes. The results indicate that larger surface density of both cathode and anode can provide better battery consistency, while smaller surface density can contribute to better specific capacity and smaller capacity loss after cycling. Modest cost and superior properties can be achieved for lithium-ion batteries by reasonably matching the surface density of anodes and cathodes pieces.

scholarly journals Development of a flexible anode for lithium-ion batteries from electrospun carbon-magnetite composite microfibers

2021 ◽  
Author(s):  
Carlos Andrés Velásquez Marquez ◽  
Ferley Alejandro Vásques Arroyave ◽  
Mónica Lucía Álvarez Láinez ◽  
Andrés Felipe Zapata González ◽  
Jorge Andrés Calderón Gutiérrez
Keyword(s):  
Composite Material ◽  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Homogeneous Distribution ◽  
Electrochemical Tests ◽  
Fe3o4 Nps ◽  
Free Material

The development of a binder-free material is gaining ground as a flexible anode in lithium-ion batteries due to the higher specific capacity and possibilities of usage in portable appliances. In this work, magnetite nanoparticles (Fe3O4-NPs) were incorporated into carbon microfibers (CMFs) by electrospinning technique to improve the specific capacity of active material, retaining the high flexibility of the CMFs. The composite active material (CMFs-Fe3O4) was characterized by Raman spectroscopy, Thermogravimetric analyses (TGA), and transmission electron microscopy (TEM) to determine the composition, structure, and morphology of the composite. Electrochemical tests were done to evaluate the performance of the composite material as an anode in lithium-ion batteries. Fe3O4-NPs with particle sizes from 30 to 40 nm were incorporated into CMFs (800 nm), and the TEM images showed a homogeneous distribution of Fe3O4-NPs. The electrochemical tests evidenced that magnetite incorporation increases the specific capacity by 42% on the first cycle and 20% on the 50th cycle. Similarly, the Coulombic efficiency increases by 20% in the composite material.

scholarly journals Intensification of Pseudocapacitance by Nanopore Engineering on Waste-Bamboo-Derived Carbon as a Positive Electrode for Lithium-Ion Batteries

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2733
Author(s):  
Jong Chan Hyun ◽  
Jin Hwan Kwak ◽  
Min Eui Lee ◽  
Jaewon Choi ◽  
Jinsoo Kim ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Nanoporous Carbon ◽  
Positive Electrode ◽  
High Rate ◽  
Active Electrode ◽  
Voltage Range ◽  
High Specific Energy

Nanoporous carbon, including redox-active functional groups, can be a promising active electrode material (AEM) as a positive electrode for lithium-ion batteries owing to its high electrochemical performance originating from the host-free surface-driven charge storage process. This study examined the effects of the nanopore size on the pseudocapacitance of the nanoporous carbon materials using nanopore-engineered carbon-based AEMs (NE-C-AEMs). The pseudocapacitance of NE-C-AEMs was intensified, when the pore diameter was ≥2 nm in a voltage range of 1.0~4.8 V vs Li+/Li under the conventional carbonate-based electrolyte system, showing a high specific capacity of ~485 mA·h·g−1. In addition, the NE-C-AEMs exhibited high rate capabilities at current ranges from 0.2 to 4.0 A·g−1 as well as stable cycling behavior for more than 300 cycles. The high electrochemical performance of NE-C-AEMs was demonstrated by full-cell tests with a graphite nanosheet anode, where a high specific energy and power of ~345 Wh·kg−1 and ~6100 W·Kg−1, respectively, were achieved.

scholarly journals Advances in the Applications of Graphene-Based Nanocomposites in Clean Energy Materials

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 47
Author(s):  
Yiqiu Xiang ◽  
Ling Xin ◽  
Jiwei Hu ◽  
Caifang Li ◽  
Jimei Qi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Fuel Cells ◽  
Lithium Ion Batteries ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Clean Energy ◽  
Proton Exchange ◽  
Energy Storage And Conversion ◽  
Thermoelectric Conversion

Extensive use of fossil fuels can lead to energy depletion and serious environmental pollution. Therefore, it is necessary to solve these problems by developing clean energy. Graphene materials own the advantages of high electrocatalytic activity, high conductivity, excellent mechanical strength, strong flexibility, large specific surface area and light weight, thus giving the potential to store electric charge, ions or hydrogen. Graphene-based nanocomposites have become new research hotspots in the field of energy storage and conversion, such as in fuel cells, lithium-ion batteries, solar cells and thermoelectric conversion. Graphene as a catalyst carrier of hydrogen fuel cells has been further modified to obtain higher and more uniform metal dispersion, hence improving the electrocatalyst activity. Moreover, it can complement the network of electroactive materials to buffer the change of electrode volume and prevent the breakage and aggregation of electrode materials, and graphene oxide is also used as a cheap and sustainable proton exchange membrane. In lithium-ion batteries, substituting heteroatoms for carbon atoms in graphene composite electrodes can produce defects on the graphitized surface which have a good reversible specific capacity and increased energy and power densities. In solar cells, the performance of the interface and junction is enhanced by using a few layers of graphene-based composites and more electron-hole pairs are collected; therefore, the conversion efficiency is increased. Graphene has a high Seebeck coefficient, and therefore, it is a potential thermoelectric material. In this paper, we review the latest progress in the synthesis, characterization, evaluation and properties of graphene-based composites and their practical applications in fuel cells, lithium-ion batteries, solar cells and thermoelectric conversion.

scholarly journals Improvement of long-term cycling performance of high-nickel cathode materials by ZnO coating

2021 ◽  
Vol 10 (1) ◽  
pp. 210-220
Author(s):  
Fangfang Wang ◽  
Ruoyu Hong ◽  
Xuesong Lu ◽  
Huiyong Liu ◽  
Yuan Zhu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Solid Phase ◽  
Low Cost ◽  
Specific Capacity ◽  
High Capacity ◽  
Lithium Ion ◽  
Side Reaction ◽  
Chemical Route ◽  
High Nickel

Abstract The high-nickel cathode material of LiNi0.8Co0.15Al0.05O2 (LNCA) has a prospective application for lithium-ion batteries due to the high capacity and low cost. However, the side reaction between the electrolyte and the electrode seriously affects the cycling stability of lithium-ion batteries. In this work, Ni2+ preoxidation and the optimization of calcination temperature were carried out to reduce the cation mixing of LNCA, and solid-phase Al-doping improved the uniformity of element distribution and the orderliness of the layered structure. In addition, the surface of LNCA was homogeneously modified with ZnO coating by a facile wet-chemical route. Compared to the pristine LNCA, the optimized ZnO-coated LNCA showed excellent electrochemical performance with the first discharge-specific capacity of 187.5 mA h g−1, and the capacity retention of 91.3% at 0.2C after 100 cycles. The experiment demonstrated that the improved electrochemical performance of ZnO-coated LNCA is assigned to the surface coating of ZnO which protects LNCA from being corroded by the electrolyte during cycling.

The Reinforcing Effect of Combined Carbon Nanotubes and Acetylene Blacks on the Positive Electrode of Lithium-Ion Batteries

ChemSusChem ◽  
2008 ◽  
Vol 1 (11) ◽  
pp. 911-915 ◽  
Author(s):  
Chiaki Sotowa ◽  
Gaku Origi ◽  
Masataka Takeuchi ◽  
Yoshiyuki Nishimura ◽  
Kenji Takeuchi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Positive Electrode ◽  
Reinforcing Effect
Sign in / Sign up

Export Citation Format

Share Document