Electrochemical Properties of Solution Synthesized Undoped and Aluminum Doped Lithium Manganate Thin Films

2004 ◽  
Vol 822 ◽  
Author(s):  
S.R. Das ◽  
N.K. Karan ◽  
S.B. Majumder ◽  
R.S. Katiyar
Keyword(s):  
Thin Films ◽  
Elevated Temperatures ◽  
Low Cost ◽  
Lithium Ion ◽  
Cost Effective ◽  
Research Issues ◽  
Growth Technique ◽  
Benign Nature ◽  
Lithium Manganate ◽  
Ion Intercalation

AbstractThe spinel structured lithium manganate (LMO) is a promising cathode material for lithium ion rechargeable micro-batteries due to its higher energy density, environmentally benign nature, and low cost. To date, self-discharge and capacity fading (4 and 3V range), especially at elevated temperatures, still remains major research issues of LMO based cathodes. In the present work we have successfully synthesized lithium manganate thin films by a cost effective solution growth technique. These films exhibited excellent reversible lithium ion intercalation behavior with a discharge capacity of about 55.08:Ahcm−2:m−1 at a load of 20:Acm−2. The Li+ diffusivity was found to increase by substituting a part of manganese with aluminum (Al) in LMO lattice. Al substituted LMO films exhibited better cycleability as compared to the undoped LMO films. Further studies are in progress to investigate the effect of Al substitution on the cycleability of the films.

scholarly journals Low-cost VO2(M1) thin films synthesized by ultrasonic nebulized spray pyrolysis of an aqueous combustion mixture for IR photodetection

RSC Advances ◽  
2019 ◽  
Vol 9 (18) ◽  
pp. 9983-9992 ◽  
Author(s):  
Inyalot Jude Tadeo ◽  
Emma P. Mukhokosi ◽  
Saluru B. Krupanidhi ◽  
Arun M. Umarji
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Electrical Transport ◽  
Low Cost ◽  
Cost Effective ◽  
Large Area ◽  
Nebulized Spray Pyrolysis ◽  
Combustion Mixture

We report detailed structural, electrical transport and IR photoresponse properties of large area VO2(M1) thin films deposited by a simple cost-effective two-step technique.

Dissolution Kinetics of Spinel Lithium Manganate and its Relation to Capacity Fading in Lithium Ion Batteries

2002 ◽  
Vol 17 (6) ◽  
pp. 1476-1481 ◽  
Author(s):  
Chung-Hsin Lu ◽  
Shang-Wei Lin
Keyword(s):  
Elevated Temperatures ◽  
Lithium Ion ◽  
Dissolution Kinetics ◽  
Reaction Rate Constant ◽  
Dissolution Behavior ◽  
Capacity Fading ◽  
Dissolution Reaction ◽  
Lithium Manganate ◽  
Spinel Lithium Manganate ◽  
Kinetics Of

The dissolution behavior and kinetics of spinel lithium manganate LiMn2O4 with different particle sizes have been investigated in this study. The dissolution of manganese cations from LiMn2O4 is confirmed to occur when LiMn2O4 particles are immersed in the electrolytes. The amount of dissolved manganese ions markedly increases with a rise in temperature and a decrease in particle size, which implies that the capacity fading of LiMn2O4 at elevated temperatures is associated with manganese dissolution. On the basis of the isothermal analysis of reaction kinetics, the rate of manganese dissolution from LiMn2O4 is dominated by the rate of dissolution reaction. Smaller particles exhibit a larger reaction rate constant and higher activation energy of the dissolution process than the larger ones. Therefore, an increase in temperature has a more pronounced effect on the dissolution reaction of small particles than on that of large particles.

Aluminum-Ion-Intercalation Nickel Oxide Thin Films for High Performance Electrochromic Energy Storage Devices

2021 ◽  
Author(s):  
Hongliang Zhang ◽  
Sheng Liu ◽  
Tao Xu ◽  
Weiping Xie ◽  
Guoxin Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Energy Storage ◽  
High Performance ◽  
Lithium Ion ◽  
Storage Device ◽  
Energy Storage Device ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Aluminum Ion ◽  
Ion Intercalation

Aluminum-ion electrochromic energy storage device (EESD) is one of the most promising alternatives to lithium-ion device. Nevertheless, it faces a substantial challenge in the successful application due to the difficulties...

scholarly journals Nano Silicon Composite with Gelatin/Melamine Derived N-doped Carbon as an Efficient Anode Material for Li-ion Batteries

2021 ◽  
Vol 59 (11) ◽  
pp. 802-812
Author(s):  
Venugopal Nulu
Keyword(s):  
Anode Material ◽  
Structural Stability ◽  
Low Cost ◽  
Rate Capability ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Carbon Matrix ◽  
Cost Effective ◽  
Si Nanoparticles ◽  
Nitrogen Doped Carbon

Silicon (Si) has a high theoretical capacity and low working potential vs. Li/Li+, and has been investigated as the most capable negative electrode material for lithium-ion batteries (LIBs). However, Si undergoes significant volume changes during the Li+ alloying/ dealloying processes, leading to unstable cycle life and limiting its practical applicability in anodes. Introducing carbon into the Si anodes can effectively address the Si drawbacks, while providing advantages of improved conductivity and structural stability. In this study we choose gelatin/ melamine combination as an eco-friendly and cost-effective source for nitrogendoped carbon to make a Si composite. The prepared composite was studied as an anode material for LIBs, and it delivered excellent cyclability with 2175 mAh g-1 capacity after 50 cycles with 86% capacity retention at 200 mA g-1. The composite exhibited superior rate capability and improved Li+ diffusion properties compared with bare Si nanoparticles (Si NP). The significant enhancement could be attributed to the structural stability and conductivity provided by the nitrogen-doped carbon matrix. This work promotes emerging batteries with low-cost materials as a promising solution for increasing energy storage requirements.

Structural and Optical Properties of ZnO Nanorods Thin Films by Solution-Growth Method

2011 ◽  
Vol 225-226 ◽  
pp. 597-600 ◽  
Author(s):  
Chu Chi Ting ◽  
Sie Ping Chang
Keyword(s):  
Thin Films ◽  
Large Scale ◽  
Low Cost ◽  
Zno Nanorods ◽  
Solution Growth ◽  
Growth Technique ◽  
Glass Substrates ◽  
Growth Method ◽  
Vertically Aligned ◽  
Solution Growth Technique

Highly c-axis-oriented ZnO nanorods thin films were obtained on silica glass substrates by a simple solution-growth technique. The most compact and vertically-aligned ZnO nanorods thin film with the thickness of ~800 nm and average hexagonal grain size of ~200 nm exhibits the average visible transmittance 85%, refractive index 1.74, and packing density 0.84. As we demonstrate here, the solution-growth technique was used to produce high-quality and dense ZnO nanorods thin films, and is an easily controlled, low-temperature, low-cost, and large-scale process for the fabrication of optical-grade thin films.

Digital Optical Imaging Of Benzocyclobutene (Bcb) Thin Films On Silicon Wafers

1995 ◽  
Vol 381 ◽  
Author(s):  
Robert A. DeVries ◽  
Reed A. Shick ◽  
Bethany K. Johnson
Keyword(s):  
Thin Films ◽  
Optical Imaging ◽  
Fluorescent Dyes ◽  
Low Cost ◽  
Cost Effective ◽  
Silicon Wafers ◽  
Labor Costs ◽  
Or Efficiency ◽  
Optical Inspection ◽  
Automated Optical Inspection

AbstractA practical, low-cost research system for the fluorescent optical imaging of BCB (DVS-bisBCB) thin films has been used for the first time to evaluate coating quality on spin coated silicon wafers. In general, DVS-bisBCB thin films are easily produced defect free with a high degree of planarization. Various features of the coating are enhanced visually by the fluorescence making detection, digital storage, and quantification easier. Examples of features found in defective coatings made intentionally by a process to generate several common thin film defects are variations in film thickness, foreign particles, pinholes, and residual polymer in vias. The fluorescent bands of the normally transparent resin are easily excited in the near UV with a mercury lamp, causing a semi-opaque visible emission which could be observed by conventional imaging hardware. The BCB fluorescent quantum yield, or efficiency, is similar to fluorescent dyes so that only a small amount of BCB need be present in a substrate to allow optical inspection.This strong fluorescent property of DVS-bisBCB polymer, not possessed by many polyimide resins, could reduce labor costs of manual inspections and improve multichip module (MCM) processing yields. This digital imaging technique has potential for further development as a cost-effective automated optical inspection (AOI) method.

scholarly journals Reduction of Grain Boundary Resistance of La0.5Li0.5TiO3 by the Addition of Organic Polymers

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 61
Author(s):  
Iker Boyano ◽  
Aroa R. Mainar ◽  
J. Alberto Blázquez ◽  
Andriy Kvasha ◽  
Miguel Bengoechea ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Grain Boundary ◽  
Solid Electrolytes ◽  
Safety Issue ◽  
Low Cost ◽  
Lithium Ion ◽  
Cost Effective ◽  
Boundary Resistance ◽  
Organic Polymers ◽  
Different Characteristics

The organic solvents that are widely used as electrolytes in lithium ion batteries present safety challenges due to their volatile and flammable nature. The replacement of liquid organic electrolytes by non-volatile and intrinsically safe ceramic solid electrolytes is an effective approach to address the safety issue. However, the high total resistance (bulk and grain boundary) of such compounds, especially at low temperatures, makes those solid electrolyte systems unpractical for many applications where high power and low temperature performance are required. The addition of small quantities of a polymer is an efficient and low cost approach to reduce the grain boundary resistance of inorganic solid electrolytes. Therefore, in this work, we study the ionic conductivity of different composites based on non-sintered lithium lanthanum titanium oxide (La0.5Li0.5TiO3) as inorganic ceramic material and organic polymers with different characteristics, added in low percentage (<15 wt.%). The proposed cheap composite solid electrolytes double the ionic conductivity of the less cost-effective sintered La0.5Li0.5TiO3.

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