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Studies on Preparation, Modification and Electrochemical Performance of BiF3 as a Positive Electrode for Rechargeable Lithium Battery

Author: WangXin
Tutor: WangXianYou
School: Xiangtan University
Course: Physical and chemical
Keywords: Lithium secondary battery Cathode material Metal fluoride Fluorinated bismuth Reversible chemical conversion reaction
CLC: TM912.9
Type: Master's thesis
Year: 2009
Downloads: 46
Quote: 0
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Abstract


The metal fluoride recent years developed a new lithium ion battery cathode materials, its working principle is based on the the reversible chemical conversion reaction, unlike traditional lithium ion intercalation / prolapse reaction mechanism, obtain the specific energy is significantly higher than the traditional insertion and extraction-type lithium-ion batteries, lithium-ion battery research has become one of the hot spots. Fluoride low conductivity leads to the actual capacity is not high and, therefore, improve its conductivity has become the focus of the fluoride positive materials. This article was first adopted the liquid precipitation Law to synthetic BiF 3 characterize its structure and morphology, by adding the conductance agents and doping methods to improve the BiF 3 conductivity of and to improve the electrochemical performance objective study. Focus on the BiF doped conductive agent 3 / C and BiF , 3 / Ag composite oxygen anion doping product is BiO 0.1 F < sub> 2.8 and BiO 0.1 F 2.8 / C, anion and cation doping product of Bi 2 VO 5 F physical and chemical properties and electrochemical properties. The main functions include: (1) for the synthesis of liquid precipitation the BiF 3 , X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical testing of its structure and electrochemical properties conducted research and found that the as poorly conductive cathode material, and the discharge cutoff voltage of 1.0V, 0.1C under magnification of the initial discharge capacity of 236 mAh / g. (2) in the liquid phase precipitation prepared BiF 3 process, adding activated carbon preparation the C 5wt.% The BiF of 3 / C composites; prepared BiF < sub> 3 with HCOONH 4 and the AgNO 3 solution mixing, milling mixture HCOO-Ag reduced to metallic Ag, evenly coated in the BiF 3 surface and preparation containing Ag 5wt.% the BiF of 3 / Ag composite. Of BiF 3 / C and BiF , 3 / Ag physical properties and electrochemical properties were investigated using XRD, SEM and electrochemical techniques. The test results show that the physical and electrochemical properties of the two materials and BiF 3 compared been significantly improved, and BiF 3 / Ag composite electrochemical performance better than the BiF 3 / C composites, the two materials in the discharge cut-off voltage of 1.0 V 0.1C discharge rate conditions, the discharge capacity of 259 mAh / g and 267 mAh / g, respectively. (3) by liquid phase precipitation prepared BiO 0.1 F 2.8 , and activated carbon was added in the preparation process, the preparation containing C 5wt.% BIO 0.1 F 2.8 / C. Were characterized by XRD, SEM and electrochemical techniques BiO , F , 0.1 2.8 and BiO 0.1 F 2.8 / C's physical and electrochemical properties. The results show that the BiO 0.1 F 2.8 and BiO 0.1 F 2.8 / C first discharge capacity respectively. 259 mAh / g and 268 mAh / g, were higher than BiF 3 , and BiO 0.1 F 2.8 / C capacity than BiO < sub> 0.1 F 2.8 . (4) with a high temperature solid-phase synthesis of Bi 2 VO 5 F, and research synthesis conditions of their structure, morphology and electrochemical performance and found that 550 ° the electrochemical properties of the products synthesized in C between 1.4 3 .5 V at 100 mA / g constant current charge and discharge, the initial discharge platform to 1.7 V, 222 mAh capacity / g. After 15 cycles, the discharge capacity was still 105 mAh / g, the discharge voltage platform for 1.95 V.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery > A variety of materials, battery
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