Dissertation > Excellent graduate degree dissertation topics show

Li4Ti5O12 Prepared by Solution-combustion Method as Anode Material for Li-ion Battery

Author: DaiXiLi
Tutor: A.P.Baker
School: Harbin Institute of Technology
Course: Materials Science
Keywords: Li4Ti5O12 lithium ion battery solution-combustion method surfactant P123 electrochemical properties
CLC: TM912
Type: Master's thesis
Year: 2011
Downloads: 101
Quote: 0
Read: Download Dissertation

Abstract


With the rapid development of electronic industry all over the world, new generation devices become smaller and have an increasing number of applications. This tendency makes a new requirement to the Lithium ion battery. High energy density, high potential, long cycling life, high rate property, and environment friendly become the essential requirements for the next generation of electrode materials of lithium ion battery. Spinel Li4Ti5O12 is one of these new materials which had the attention of researchers in recent years. In relation to the basic properties mentioned above, Li4Ti5O12 has a flat voltage range, high reversible capacity (175mAg-1), and especially the long cycling performance due to zero-strain change during charge-discharge process. All these advantages make spinel Li4Ti5O12 to be one of the most promising candidates of anode materials for lithium ion battery with a huge researchful and commercial value.The traditional way to synthesize Li4Ti5O12 is solid-state reaction. The relative simple process is the advantage of this method, but the shortcoming is also obvious, that is, the high energy and lengthy processing. Moreover,the drawback of its poor electrical conductivity(10-13Scm-1) and low Li-ion diffusion coefficient(2×10-8cm2s-1) results in a poor rate capability. To solve the problems above, a solution-combustion method, using tetrabutyl titanate （Ti （OC4H9）4） and lithium nitrate （LiNO3） as raw material, was devised to synthesize phase pure nanosize Li4Ti5O12. By exploiting the conditions of the experiment, we summed a best way to synthesize spinel Li4Ti5O12, which is helpful to the commercialization of the process. The main results and conclusions are as follows:1. Combustion method by using P123 as surfactant can synthesize Li4Ti5O12 with highly porous structure which is beneficial to the electrochemical performance.2. Varying the conditions of heat-treatment, different products with different purity, dispersity and grain size can be obtained. Samples heat-treated in air will get better dispersity and purity but larger grain size, while samples heat-treated in Ar will get smaller grain size but worse dispersity and purity.3. Considering the volatilization of Li during long time and high temperature heat-treatment, a certain excess of Li source is necessary. Through the experiment results, we can see that the sample with 510% extra Li gives the purest Li4Ti5O12.4. Whether the as-synthesized powder is heat-treated in air or Ar, the sample containing 5% extra Li has got the highest specific capacity. This indicates that the higher the purity and the better the dispersity is, the better electrochemical property would be.5. All the samples have an excellent cycle performance both for heat-treatment in air and Ar. After 30 cycles at various charge-discharge rate, the retention efficiency of capacity can keep above 96%. This is determined by its inherent nature.6. As for the samples heat-treated in Ar, the residual carbon enhances the conductivity of the composite material, and this does improve its performance at high charge-discharge rate.

Related Dissertations

  1. Preparation and Properties of Silicon Carbon Anode for Lithium Ion Battery,TM912.9
  2. LSGM electrolyte thin films and electrochemical properties of,TM911.4
  3. Synthesis and Modification of Cathode Materials LiFePO4 and Li2FeSiO4 for Lithium Ion Battery,TM912
  4. Synthesis and Modification of Nano LiFePO4 as Cathode Materials,TM912
  5. Study on Synthesis and Modified of LiFePO4 as Cathode Materials,TM912
  6. Magnesium alloy surface MoS2 / resin hybrid layer Preparation and Properties,TG174.4
  7. Photocatalytic Reduction of Nitrate on Metal Modified TiO2,X703
  8. Preparation and Research Electrochemical Properties of LiFePO4 for Cathode Material of Lithium-ion Batteries,TM912
  9. Mg-Ni-La bulk metallic glass systems and hydrogen storage properties of crystallization,TG139.8
  10. New Rechargeable Magnesium Battery Cathode Material silicate Cobalt Magnesium Preparation and Properties,TM912
  11. Porous electrode material of vanadium pentoxide Synthesis, Characterization and Properties,O614.511
  12. Graphite anode low temperature performance influencing factors and improving research,TM912
  13. New lithium -ion battery anode material Li 4 Ti 5 O 12 Preparation and Modification,TM912
  14. Zinc Electrowinning with the preparation and properties of new lead-based alloy anodes,TF81
  15. Ti-Al laminated composite electrode material preparation process and performance,TB331
  16. The Tin Oxide array electrode preparation and electrochemical properties of the anode as lithium,TM911.1
  17. Studies on Anti-Corrosion Behaviors of Electroless Deposited Ni-P and Ni-P-PTFE Coatings in Seawater,TQ153.1
  18. Platinum -based cerium - doped carrier film electrode preparation and electrochemical properties of,TM911.4
  19. Study on the Synthesis and Properties of LiFePO4 with Ferric Ions,TM912
  20. Design and Implementation on Battery Management System of EV,TM912
  21. Synthesis of Positive Materials of Modified Lithium Iron Phosphate and Their Electrochemical Performance,TM912

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