Dissertation > Excellent graduate degree dissertation topics show

The Investigations on Technics and Properties of Carbonaceous Anode for Lithium-ion Batteries and 18650 Batteries of High Capacity

Author: YeWei
Tutor: LiQi
School: Hunan University
Course: Polymer materials
Keywords: 18650 lithium-ion battery of high capacity carbonaceous anode water-based binder technics SEI
CLC: TM912
Type: Master's thesis
Year: 2006
Downloads: 369
Quote: 1
Read: Download Dissertation

Abstract


The effects of factors, such as electrode, electrolyte and technics of preparation of electrode on carbonaceous anode and the interface between anode and electrolyte(SEI) were investigated by testing simulated half-cells assembled (Li metal|separator(organic electrolyte)|carbonaceous anode) in terms of Constant Current(CC), Cyclic Voltammetry(CV), Electrochemical Impedance Spectra(EIS), Scanning Electron Microscope(SEM) and Differential Scanning Calorimetry(DSC). The results show that carbonaceous mesophase spherules (CMS) is an excellent anode material for lithium-ion battery, properties of half-cells in which water-based binder(Binder A) was used are good, and the best when the content of water-based binder is 6%. Water-based binder (Binder A) can be a good substitution of PVDF, but its requirements to technics of preparation of electrode is stricter compared to PVDF, for example, density of volume and compression mode of electrode is critical to the properties of cells. The conductive additive of carbon black to CMS anode can reduce the interner resistance and improve the performances of charge at a large current and cycle, but enhance initial irreversible capacity and depress practical reversible discharge/charge capacity. The investigations to the interface between anode and electrolyte show that the compatibility of electrolyte (1mol/L LiPF6/(EC+DEC+EMC))to CMS anode is the best when the ratio of mixed solvent (EC:DEC:EMC) is 1:0.5:0.5. And the impedance of interface between anode and electrolyte increases along with the increase of cycle number and the enhancement of content of lithium ion in electrode. The onset temperature of thermal decomposition of interface SEI of electrode in the state of full charge is low and the thermal stability of SEI is bad in contrast to that in the state of zero charge.The studied anode system is applied to 18650 lithium-ion batteries. Through further investigating and summarizing, an excellent technical flow is fixed and 18650 lithium-ion batteries of high capacity are produced by means of a middle-try product line. And they are tested. The result shows that the special capacity of battery is more than 2300mAh, interner resistance is less than 70m?, and the performances of high/low temperature, safety and adaptation to environment are uniform to GB/T18287-2000.

Related Dissertations

  1. Research on Silicon Based Anode for High Capacity Lithium Ion Batteries,TM912.9
  2. Study on the Agronomic Traits and Summer Sowing Cultivation Technology of New Purple-tsaitai F1 Hybrid - "Wucaihuangtai No.1",S634.5
  3. Study on the Integrated FIBR Process for Community Wastewater Treatment,X703
  4. Research on Vermiculite Expansion Characteristics and the Determination Method of Vermiculite Expansion Ratio,X703
  5. The Investigation of the Spectral Characteristico of the Acidic Water and Its General Treatment in Dexing Mining,X751
  6. In LiFePO_4 cathode materials for lithium-ion battery production process and properties,TM912
  7. Study on Synthesis and Properties of FeS2 Cathode Material by Hydrothermal Method,TM912.9
  8. Study of Complete Quality Measurement for FOG Fiber Coils,V241.5
  9. Study on the Microstructure and Properties of Arc Remelting Hot-dip Aluminum Steel,TG174.443
  10. The Study on the Mechanism of Oleanolic Acid Treat Human Hypertrophic Scar,R285
  11. Alumina template preparation process and electrodeposited magnetic nanowire,TB383.1
  12. Application of Trans-1, 4-Polyisoprene and Epoxidized Trans-1, 4-Polyisoprene in All-Steel Radial Tyre,TQ336.1
  13. Studies on Quality Improvement of Gabaron Tea,S571.1
  14. The Study on Arctium Lappa.L and Its Compound Prescription,R283
  15. The Primary Studies on Active Compounds of Potentilla Anserina L.,R29
  16. The matrix screening mesh Ann ointment and molding process,TQ463.2
  17. Study on the Technology of Direct Powder Compression in Jiang Ya Bi Feng Tablet of Traditional Chinese Medicine,TQ461
  18. Research of Laminated LiFePO4 Li-ion Battery Swollen,TM912
  19. Study of Sulfur-based Composite Cathodes for Secondary Lithium-sulfur Battery,TM912
  20. Stone in Building Techniques of Chinese Traditional Architectural,TU-0
  21. Lujin heritage and process optimization studies,J523.5

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