Synthesis and electrochemical performance of Li1+xV3O8 as cathode material prepared by citric acid and tartaric acid assisted sol–gel processes

2013 ◽  
Vol 13 (3) ◽  
pp. 517-521 ◽  
Author(s):  
Miao Shui ◽  
Weidong Zheng ◽  
Jie Shu ◽  
Qingchun Wang ◽  
Shan Gao ◽  
...  
Keyword(s):  
Citric Acid ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Tartaric Acid ◽  
Sol Gel

scholarly journals Improved electrochemical performance of SiO2-coated Li-rich layered oxides-Li1.2Ni0.13Mn0.54Co0.13O2

2020 ◽  
Vol 31 (21) ◽  
pp. 19475-19486
Author(s):  
Jeffin James Abraham ◽  
Umair Nisar ◽  
Haya Monawwar ◽  
Aisha Abdul Quddus ◽  
R. A. Shakoor ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Sol Gel ◽  
Rate Capability ◽  
Lithium Ion ◽  
Side Reactions ◽  
Operating Voltage ◽  
Layered Oxides ◽  
Capacity Retention ◽  
Xps Characterization

AbstractLithium-rich layered oxides (LLOs) such as Li1.2Ni0.13Mn0.54Co0.13O2 are suitable cathode materials for future lithium-ion batteries (LIBs). Despite some salient advantages, like low cost, ease of fabrication, high capacity, and higher operating voltage, these materials suffer from low cyclic stability and poor capacity retention. Several different techniques have been proposed to address the limitations associated with LLOs. Herein, we report the surface modification of Li1.2Ni0.13Mn0.54Co0.13O2 by utilizing cheap and readily available silica (SiO2) to improve its electrochemical performance. Towards this direction, Li1.2Ni0.13Mn0.54Co0.13O2 was synthesized utilizing a sol–gel process and coated with SiO2 (SiO2 = 1.0 wt%, 1.5 wt%, and 2.0 wt%) employing dry ball milling technique. XRD, SEM, TEM, elemental mapping and XPS characterization techniques confirm the formation of phase pure materials and presence of SiO2 coating layer on the surface of Li1.2Ni0.13Mn0.54Co0.13O2 particles. The electrochemical measurements indicate that the SiO2-coated Li1.2Ni0.13Mn0.54Co0.13O2 materials show improved electrochemical performance in terms of capacity retention and cyclability when compared to the uncoated material. This improvement in electrochemical performance can be related to the prevention of electrolyte decomposition when in direct contact with the surface of charged Li1.2Ni0.13Mn0.54Co0.13O2 cathode material. The SiO2 coating thus prevents the unwanted side reactions between cathode material and the electrolyte. 1.0 wt% SiO2-coated Li1.2Ni0.13Mn0.54Co0.13O2shows the best electrochemical performance in terms of rate capability and capacity retention.

scholarly journals Electrochemical performance of sol-gel derived La0.6S0.4CoO3-δ cathode material for proton-conducting fuel cell: A comparison between simple and advanced cell fabrication techniques

2018 ◽  
Vol 12 (3) ◽  
pp. 277-286 ◽  
Author(s):  
Samat Abdul ◽  
Wan Yusoff ◽  
Nurul Baharuddin ◽  
Mahendra Somalu ◽  
Andanastuti Muchtar ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Screen Printing ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Cathode Layer ◽  
Spectroscopy Analysis ◽  
Proton Conducting ◽  
Cell Fabrication ◽  
Screen Printed

In this study, the effects of different fabrication techniques on the electrochemical performance of solgel derived La0.6Sr0.4CoO3-? (LSC) cathode material for intermediate temperature proton-conducting fuel cells were investigated. Single-phase, sub-micron LSC powder was used to prepare cathode slurries by a simple grinding-stirring (G-S) technique and an advanced ball milling-triple roll milling (BM-TRM) technique. The prepared G-S and BM-TRM cathode slurries were brush painted and screen printed, respectively, onto separate BaCe0.54Zr0.36Y0.1O2.95 (BCZY) proton-conducting electrolytes to fabricate symmetrical cells of LSC|BCZY|LSC. The thickness of LSC cathode layer prepared by brush painting and screen printing was 17 ? 0.5 ?m and 7 ? 0.5 ?m, and the surface porosity of the layers was 32% and 27%, respectively. Electrochemical impedance spectroscopy analysis revealed that the layer deposited by screen printing had lower area specific resistance measured at 700?C (0.25Wcm2) than the layer prepared by brush painting of G-S slurry (1.50Wcm2). The enhanced LSC cathode performance of the cell fabricated using BM-TRM assisted with screen printing is attributed to the improved particle homogeneity and network in the prepared slurry and the enhanced particle connectivity in the screen printed film.

Sign in / Sign up

Export Citation Format

Share Document