Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells

Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells

Bibliographic Details
Main Author: Garlapati, Vasisht
Language:English
Published: University of Dayton / OhioLINK 2010
Subjects:
Materials Science
Mechanical Engineering
cathode
lithium-air cell
solid state
air cathode
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=dayton1269636615
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-dayton12696366152021-08-03T05:35:37Z Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells Garlapati, Vasisht Materials Science Mechanical Engineering cathode lithium-air cell solid state air cathode <p>A solid state lithium-air battery is receiving considerable attention by the battery community recently. A challenging part of making a solid state lithium-air battery is to develop a solid state air-cathode. The present study relates to the development of the air-cathode. The air-cathode consists of a lithium ion conducting material, electron conducting material, metal substrate, binder and dispersant. For lithium ion conduction Lithium aluminum germanium phosphate (LAGP) glass-ceramic powder was used. For electron conduction two types of carbon were used. One type of carbon help in providing better electron conductivity and the other type of carbon helps in pore formation in the cathode. Nickel mesh/foam was used for structural support and current collection. Polytetrafluoroethylene (PTFE) was used to bind LAGP and carbon. Dispersant was used for preventing LAGP and carbon powders from agglomerating. The investigation includes evaluation of processing parameters including the effect of LAGP or dispersant concentration on the rate capacity. LAGP glass was prepared at 1350°C and crystallized at 850°C for 12 hours to transform it into a glass- ceramic. The cathodes prepared from the batch materials and processed were characterized to determine porosity, surface area, pore size and volume. To evaluate the electrochemical properties of these cathodes twelve lithium-air cells were fabricated and tested in the temperature range 45 – 115°C and were characterized using a Solartron 1260 impedance analyzer with 1287 electrochemical interface in oxygen atmosphere under 1 kPa pressure.</p><p>It was determined that the use of dispersant helped the cathode obtain a porosity of 22% which is due to the proper dispersion of LAGP in cathode. A dispersant concentration of 5.92 wt% helped the cell discharge at a voltage of 2.5 V for 35 hours and achieved a capacity of 14.1 mAh at 75°C. LAGP concentration of 90 wt% helped in discharging the cell with a current of 0.50 mA for 13 hours at 75°C. The enhanced capacity of the cell is attributed to the catalyzing effect of LAGP for oxygen reduction. A capacity of 8.76 mAh was obtained at 67°C by having nickel foam side exposed to oxygen flow. The capacity was obtained because of the better oxygen transport inside the cathode.</p> 2010-04-13 English text University of Dayton / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=dayton1269636615 http://rave.ohiolink.edu/etdc/view?acc_num=dayton1269636615 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Materials Science
Mechanical Engineering
cathode
lithium-air cell
solid state
air cathode
spellingShingle Materials Science
Mechanical Engineering
cathode
lithium-air cell
solid state
air cathode
Garlapati, Vasisht
Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells
author Garlapati, Vasisht
author_facet Garlapati, Vasisht
author_sort Garlapati, Vasisht
title Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells
title_short Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells
title_full Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells
title_fullStr Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells
title_full_unstemmed Development of High Performance Air-Cathodes for Solid State Lithium-Air Cells
title_sort development of high performance air-cathodes for solid state lithium-air cells
publisher University of Dayton / OhioLINK
publishDate 2010
url http://rave.ohiolink.edu/etdc/view?acc_num=dayton1269636615
work_keys_str_mv AT garlapativasisht developmentofhighperformanceaircathodesforsolidstatelithiumaircells
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