Dissertation > Excellent graduate degree dissertation topics show

Preparation of Silicon-based Alloy Anode Material Andelectrochemical Properties

Author: XieRui
Tutor: HuangFeng
School: Wuhan University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Lithium-ion battery Melting Ball milling Binary alloy ternary alloy
CLC: TM912
Type: Master's thesis
Year: 2011
Downloads: 102
Quote: 0
Read: Download Dissertation

Abstract


With the rapid development of the modern society, the mobile communications and other electronic equipment for lithium ion batteries have the higher capacity requirements. Silicon alloy anode material is paid more attention by the researchers because of its high capacity. In this article, binary alloy and ternary alloy are made by ball milling in acetone after pure metal had been melting, and studied the modification of alloy material mixed with carbon. Electrochemical performance of silicon alloy as Lithium battery anode material was tested, the charge-discharge mechanism of silicon alloy was researched, the reason why electrochemical performance improves after modification of alloy material mixed with carbon was also investigated in this article. The main conclusions are as below:(1) The first discharge capacity of binary alloy and ternary alloy is both higher , but the first charge capacity is smaller. For example, the first charge-discharge capacities of the sample with Si content 80% are 332 mAh/g, 1409mAh/g respectivitily in the Fe-Ni-Si alloy. Overmore, cycling performance of the alloy is poorer. The capacity of the sample with Si content 80% in the Fe-Ni-Si alloy will be 0 after 5 cycles.(2) After the modification, the first charge capacity and cycling performance of binary alloy and ternary alloy are greatly improved. For example, the first charge-discharge capacities of the sample with Si content 80% are 520 mAh/g, 950mAh/g in the Fe-Ni-Si alloy. The capacity remains 180 mAh/g till it cycles to the tenth week. But the Si content is lower in the sample with the better electrochemical performance.(3) Binary alloy、ternary alloy and the alloy after modification have the same charge and discharge mechanism. The main components of the alloy and the material after modification are simple substance Si and Inert alloy. Simple substance Si reacts with Li+ in the process of charge-discharge, and plays a role in providing capacity. Inert alloy Plays a supporting frame structure of the material, and eases the effect that Si reacts with Li+ in the process of charge-discharge.(4)In binary alloys, Ni-Si modified before the electrochemical properties of binary alloys is superior to Fe-Si binary alloy. The doped carbon modification, the electrochemical properties of binary alloys is greatly is greatly improved, Fe-Si/C composite material is superior electrochemical performance Ni-Si/C composite materials. Comparison of binary alloys and ternary alloys, ternary alloys modified to be better than before and after theelectrochemical properties of binary alloys.

Related Dissertations

  1. Theoretical Model of Formation Enthalpy for Ternary Alloy and Its Application in Prediction of Phase Transformation of Aluminum Alloy,TG146.21
  2. Wafer Level Vacuum Packaging of MEMS Device by Solder Sealing,TN305
  3. Study on the Wear Resistant of Ni-Based Tungsten Carbide Composite Coating in Different Depths,TG174.4
  4. Preparation on New Ni-Cr-Fe Alloy as Bipolar Plates for PEMFC,TM911.4
  5. Study about Intelligent Decision-making Technology of Power Grid Melting-ice Based on Emergency Plan,TM769
  6. Study on High-performance Electrode Materials for Lithium Ion Batteries,TM912
  7. Preparation and Performance of Nano-composite Polymer Electrolytes,TM912
  8. Synthesis and Modification of Layered Compound Cathode Material for Lithium-ion Batteries,TM912
  9. Application of Finite Volume Method in Melting Ice of Conductor Wire by Large Current,TM75
  10. Research on High Pressure Melting Curve of Typical Metal,O521.2
  11. Rapid Detection of Drug-resistant Mycobacterium Tuberculosis with High-resolution Melting Curves,R378
  12. Cloning, Expression and Insecticidal Activity of Novel cry9 Genes from Bacillus Thuringiensis,S476.1
  13. Preparation and Electrochemical Properties of Three-dimensionally Ordered Macroporous Electrode Materials,TM912
  14. Electrochemical Performance and Preparation of Electrospun PVDF/PMMA Membranes for Lithium Ion Battery,TM912
  15. Cord Steel plastic inclusions thermodynamic calculations,TK123
  16. Recovery of Metal from Spent Lithium-ion Batteries,TM912
  17. Lithium battery protection research and design of integrated circuits,TM912
  18. Researches on Sn-basic Alloy and Sn-basic Composite Materials for Lithium Ion Batteries Anode,TM912
  19. The Fabrication, Structure and Properties of SnO2/Sn/C Composites Anode Materials for Lithium Ion Batteries,TM912
  20. Electric Vehicle Lithium-ion Battery Management System Analysis and Design,TM912
  21. Preparation of High Density LiNi1/3CO2/3-xALxO2 and LiNi 1/3CO1/3 MN1/6Al 1/6O2 as Cathode Material for Lithium Ion Battery by a Molten Salt Method,TM912

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