Thermally Treated Sri Lankan Graphite as an Anode Material for Rechargeable Lithium-Ion Battery

Show simple item record Rupasingha, M.N. 2019-04-26T08:28:44Z 2019-04-26T08:28:44Z 2012
dc.identifier.other UWU/SCT/08/0032
dc.description.abstract Graphite is a typical layered compound that consists of hexagonal sheets of sp2-carbon atoms weakly bonded together by Vander Waals force. Therefore, it is an excellent lithium intercalation compound as anode materials in Lithium ion rechargeable batteries (LIB). Reversible intercalation and deintercalation are key process operating in lithium ion cells by high capacity (337 mAh/g) and low potential (0.1 — 0.3 V vs. Li+/LI). Natural graphite would be a strong candidate since it is cheap. The surface chemistry of the graphite can be effectively modified by mild oxidation in air by forming dense oxide layer which is important for formation of a stable and protecting solid electrolyte interface (SEI) during initial few cycles non-toxic and widely available. Sri Lankan natural graphite is a potential candidate for anode material due to high purity, low cost and wide availability Therefore, with in this study aims to develop performance enhanced low-cost anode material based on thermal oxidation of different structural types of vein graphite from Bogala and Kahatagaha-Kolongaha mines. Then, four structural types, namely coarse flakes of radial (CFR) graphite, coarse striated-flaky (CSF) graphite, needle-platy (NPG) graphite and shiny-slippery-fibrous (SSF) were categorized in both mines. After preparing powdered samples (<53 Jim) were used for thermal oxidation at 550°C in a Muffle Furnace (OT-HTMF 05) under air for 6hours. What more both treated and untreated samples were used to characterize electrically by using four-probe d.c. conductivity method at room temperature & used to define graphine surface is modified by carbonyl, carboxyl and hydroxyl functional groups. As a result of this study, the absence of such absorption peaks in untreated graphite reveals the formation of carbonyl group on periphery of hexagonal carbon basal plane. And also the d.c electrical conductivity of both types of graphite has increased slightly after oxidation. en_US
dc.language.iso en en_US
dc.publisher Uva Wellassa University of Sri Lanka en_US
dc.subject Science and Technology Degree Programme en_US
dc.title Thermally Treated Sri Lankan Graphite as an Anode Material for Rechargeable Lithium-Ion Battery en_US
dc.type Thesis en_US

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