Dissertation > Excellent graduate degree dissertation topics show

Lithium battery cathode material Hanliu Polymer Synthesis and Characterization

Author: WengGuoMing
Tutor: SuYuZhi
School: Guangzhou University
Course: Organic Chemistry
Keywords: Polyorgano disulfide Conductive polymers Lithium Battery Cathode material Energy storage materials
CLC: TM912
Type: Master's thesis
Year: 2010
Downloads: 164
Quote: 0
Read: Download Dissertation

Abstract


With more and more mobile tools, developed a high-energy and high-performance cathode materials is critical. Cathode material with high specific capacity is to improve the battery performance is the key, there are still a lot of research by this in the exploration. The organic disulfide is able to provide energy because the disulfide bond on the reversible redox reaction,-SS-2e 2-SH. Among them, 2,5 - dimercapto-1 ,3,4 - thiadiazole, with its very high theoretical specific energy of the high potential (relative to lithium) and stable cyclic performance man familiar. However, in practice, there are still some shortcomings, such as the reversible reaction kinetics rate is low and weak current response, etc. These will affect the battery life. In this paper, thiourea alkylation hydrolysis new and efficient method of synthesis of two organic disulfide monomer, high yield and simple preparation. And by electrochemical polymerization and chemical oxidation their synthesis of new polymers / copolymers, these two organic disulfide monomers are bis (3 - methylene-thienyl) disulfide and dibenzyl disulfide. Meanwhile, the paper also organic disulfide monomer electrochemical behavior were discussed and analyzed CE reaction mechanism, the electrochemical reaction is the rate-determining step when the conditions, using electrochemical kinetic equation derived its kinetic equation and analysis of its kinetic parameters. Thus by rotating disk electrode techniques and static test methods determine the kinetic parameters to determine the corresponding electrochemical reaction mechanism and the electrode kinetic equation. Wherein,-SS-redox properties in acetonitrile with 0.1 mol / L of n-tetrabutylammonium hexafluorophosphate ([Bu4N] [PF6]) the electrolyte system studied by cyclic voltammetry. From the results, the oxidation peak and the reduction peak potential spacing of 180 mV, which fully demonstrates its redox reversibility good. Meanwhile, in the experiment found microscopic polybis (3 - methylene thiophene) disulfide electronic state is leading the anode deactivation and re-live the main factors. All of the copolymers, in particular copolymerized bis (3 - methylene-thienyl) disulfide / dibenzyl disulfide = 1:4 more easily electrochemical copolymerization of different electrodes to be more stable and better conductivity polymers. TcB1: 4 and TcB4: 1, than polybis (3 - methylene-thienyl) disulfide and poly dibenzyl disulfide exhibit more excellent conductivity, which TcB1: 4 conductivity of up to 7.51 × 10-6 S / cm. Cyclic voltammetric analysis of the results obtained copolymer current potential curve area ratio of homopolymer to be large and the dynamics faster rate, which can determine that they can provide more energy, better performance. By chemical oxidation resulting copolymer thermal stability, at 80 oC the following will not pyrolysis, functional group stability can make it apply to lithium battery cathode material. From the surface morphological analysis of the results, in addition to TcB4: 1 outer copolymer surface is tight. These new polymers and copolymers of a battery was assembled, TcB1: 4 discharge capacity up to and voltage platform best. All results show that such copolymer material used in lithium prospects are very impressive.

Related Dissertations

  1. First-Principles Studies of Cathode Material Srn+1TinO3n+1（n=1,2,3,∞） for Solid Oxide Fuel Cell,TM911.4
  2. Synthesis and Modification of Cathode Materials LiFePO4 and Li2FeSiO4 for Lithium Ion Battery,TM912
  3. Synthesis and Modification of Nano LiFePO4 as Cathode Materials,TM912
  4. Preparation and Research Electrochemical Properties of LiFePO4 for Cathode Material of Lithium-ion Batteries,TM912
  5. Bacterial cellulose gel lithium battery of polymer electrolyte membrane,TM912
  6. New Rechargeable Magnesium Battery Cathode Material silicate Cobalt Magnesium Preparation and Properties,TM912
  7. Polymer micro- thermoforming key technology research,TQ320.66
  8. Study of Field Emission Properties of Printed Carbon Nanotube Films,TB383.1
  9. Preparation of PEDOT and Study on Electrochemical Performance,O633.5
  10. The Preparation and Its Aplications of Polyaniline Chemically Modified Electrodes,O657.1
  11. Study on the Synthesis and Properties of LiFePO4 with Ferric Ions,TM912
  12. The Application of a Novel Ternary Molten Salt in the Preparation of LiNi0.8 Co0.2O2 and LiNi1/3Co1/3 Mn1/3O2,TM912
  13. Effect of Treatment to Precursor on Performance of LINI0.5 MN1.5O4 , Cathode Material Li-ion Battery,TM912
  14. Preparation and electrochemical properties of lithium iron phosphate cathode material,TM912
  15. Research on Synthesis and Modification of Li3V2（PO4）3 as Lithium-ion Battery Cathode Material,TM912
  16. Synthesis and Electrochemical Property Study of LiFePO4 as Cathode Materials,TM912
  17. Battery cathode material spherical Ni (OH) _2 preparation conditions and properties of,TM911
  18. Study on Sol-gel Spin Coating Preparation and Properties of LiNi0.5Mn0.5O2 Cathode Thin-films,O614.111
  19. Study on AC Impedance Characteristics of LiFePO4 as Cathode Materials for Lithium Ion Batteries,TM912
  20. Synthesis Methods of Lithium-ion Battery Cathode Material LiMnPO4,TM912
  21. Study on Solid-state Method and Modification of Cathode Material LifePO4 of Lithium Ion Battery,TM912

CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
© 2012 www.DissertationTopic.Net  Mobile