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Anode material for lithium ion secondary battery the CAW

Author: ShenWei
Tutor: XueKuanHong
School: Nanjing Normal University
Course: Applied Chemistry
Keywords: The CAW A lithium ion secondary battery Anode material Electrochemical
CLC: TM911
Type: Master's thesis
Year: 2004
Downloads: 137
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Abstract


The solid-state carbon sources, carbon atoms line of potato starch by TEM and HRTEM, IR, Raman, and energy loss spectroscopy (EELS) and other means of characterizing the morphology, structure of the CAW. The first carbon atom wire is used as a negative electrode material for lithium ion secondary battery. By cyclic voltammetry, charge and discharge, coulometric titration, AC impedance method, the electrochemical characteristics of the study the line of the carbon atoms of the lithium ion secondary battery negative electrode; study of lithium ions in the carbon atom wire embedded / Escape mechanism; determination of lithium ion in the the the the the CAW chemical diffusion coefficient D Li kinetic parameters. In order to further improve the reversible capacity of the carbon atoms of the wire electrode, to reduce the irreversible capacity and to improve other properties, using an oxidation treatment, composite means of other elements such as the modified carbon atom wire anode. CAWs potato starch as the carbon source and to the iron-based metal as a catalyst, reaction from 500-800 ℃ tube furnace under a stream of Ar / H 2 . The product of the catalyst is removed with HCl. By HRTEM observation that, the carbon atom wire is wound with a diameter of approximately 2 (?), Close to one of the carbon atoms (approximately 1.54 (?)) Uniformly the thread diameter. Raman (Raman) and energy loss (EELS) spectra showed that the CAW has sp hybridization into key structural features. The IR spectra indicate that the carbon atom wire exists a certain amount of hydroxyl (-OH) and carboxyl (-COOH). The chemical diffusion coefficient of lithium ions in the the embedded carbon atoms wire electrode decreases with the increase in the amount of lithium ions, and then stabilized, compared with the general graphite-based carbon material, lithium ions in the carbon atoms in the wire electrode chemical diffusion coefficient is larger, so the lithium ions can be relatively convenient to embed, prolapse CAW electrode. Curve from cyclic voltammetry, and cycle charge-discharge curves generate stage of lithium carbon chimeric found no reduction peaks corresponding oxidation, or charging and discharging platform, it can be speculated lithium ion embedded disorderly CAW did not react with generate phased chimera. CAW electrode in the initial charge-discharge process irreversible larger capacity; irreversible capacity decreased, reversibility improved in the subsequent multiple cycles. CAW electrode impedance spectroscopy, high-frequency end of the semicircle corresponds to the current collector electrode and carbon atoms line interface impedance; semicircle in the middle band corresponding to the electrode and electrolyte interface passivation film resistance; while in the low-frequency end straight line or a semicircle corresponding to the diffusion of lithium ions in the carbon atoms in the wire electrode or the interface impedance between the electrode of lithium foil and the electrolyte. CAW electrode charge-discharge reversibility and cycling performance are to be improved, but its first specific discharge capacity up to 627mAh 9. 'Specific capacity than graphite-like carbon material standard 372m from g' to be much higher, but Keng ions can be easily embedded in the CAW electrode with prolapse, thus the CAW is a promising new type of hang-ion secondary battery anode material. Carbon atom wire after nitric acid treatment, the surface produced more light base (OH), the reversal of the base (20), carboxyl (COO) groups, as hang-ion embedded in the CAW electrode interface dense passivation film is formed, reducing the total embedding of the solvent molecules, to inhibit the decomposition of the electrolyte, which is conducive to reduce the irreversible capacity increase the reversible capacity and improve CAW electrode cycle performance. The first composite carbon atoms in diamond wire electrode discharge much higher than the capacity of than CAW electrode without any treatment, declined, but its first charging capacity than the latter. In addition, after several cycles, the the CAW electrode composite drill both reversible specific capacity coulombic efficiency has been greatly improved.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells
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