Dissertation > Excellent graduate degree dissertation topics show

Spectroscopic Study on the Cathode Material and Solid Electrolyte Interface for Lithium Secondary Batteries

Author: DongHua
Tutor: MoYuJun；WangZhaoXiang
School: Henan University
Course: Optics
Keywords: Lithium ion battery Surface -enhanced Raman spectroscopy SERS The solid electrolyte middle phase SEI Cathode material LiCoO2 Anode material HCS Surface Modification Infrared Spectroscopy
CLC: TM911
Type: Master's thesis
Year: 2003
Downloads: 228
Quote: 1
Read: Download Dissertation

Abstract


The first charge in the lithium-ion battery, the discharge process, the electrode material and the electrolyte in the reaction occurred on the solid-liquid phase interface, the formation of a passivation layer covering the surface of the electrode material layer, this passivation layer is an interface layer, the nature of the solid electrolyte is an electronic insulator is a good conductor of Li +, and is referred to as a solid electrolyte intermediate phase (referred to as SEI film). SEI film formation has a crucial impact on the performance of the electrode materials. On one hand, the formation of the SEI film consumes part of Li, the first discharge irreversible capacity increases, reducing the efficiency of the charging and discharging of the electrode material; the other hand, SEI film having an organic solvent-insoluble, can be stable in an organic electrolyte solution, and The solvent molecules can not through the layer passivation film, thereby effectively preventing the total embedding of the solvent molecules, to avoid the damage caused by the electrode material due to solvent molecules of embedding, thus greatly improving the performance and service life of the electrode cycle. This thesis the surface modification of cathode material and the positive and negative SEI film, the main contents as follows: 1. Chemical deposition of silver deposition in lithium ion battery cathode material LiCoO 2 particles surface. Soaked by comparing the electrolyte surface coated silver island film before and after LiCoO 2 powder Raman spectra proved LiCoO 2 surface deposition of silver island film does have surface-enhanced Raman scattering (SERS) (SERS) effect. Deposited silver island films of LiCoO 2 of the SEI film on the surface of the Raman spectra at the same time recognize the SEI film composition are Li2CO3 is, of LiOH · H2O, LiF, ROCO3Li the COC group and LiO2Li, etc., and the vibration signal indeed be enhanced. 2 the the Al2O3 nano surface coating LiCoO 2 and not surface coated nano-LiCoO 2 were soaked for a long time in the electrolyte solvent 1M EC / DMC using inductively coupled plasma emission spectroscopy (ICP), X-ray diffraction (XRD), Raman spectroscopy and electrochemical performance tests to analyze research. Found electrolyte the nano LiCoO soaked surface coated Al2O3 and the surface is not coated nano-LiCoO 2 structure and electrochemical properties have a significant impact, Li from nano size of LiCoO 2 dissolution led LiCoO 2 effective capacity decreases, the electrolyte solvent selection is very important. . Chemical deposition of silver deposited on the particle surface of the lithium-ion battery anode material hard carbon spheres (HCS), soaked by comparing the electrolyte surface coated silver island film before and after HCS Raman spectroscopy, proved in HCS deposited on the surface of silver Island The film does have the effect of surface-enhanced Raman scattering (SERS). Surface coating made of silver island film HCS electrode chip experiments loaded battery charge and discharge to a different voltage SEI film formed infrared lt; WP = gt;, and Raman spectroscopy and a preliminary study. Found that the content of the various components of the species composition of the SEI film and charge and discharge to a different potential, is a dynamic process. In summary, we chemically deposited silver mirror method produced SERS active substrate from the usual smooth surfaces such as glass or silicon extended to practical powder electrode material for lithium-ion batteries, expanding the range of applications of SERS. Using SERS effect of lithium ion battery is the nature of the surface of the anode material SEI film, Raman spectroscopy SEI film electrode materials in situ research laid the foundation for future research SEI film formation mechanism and SERS can be used as a suitable means of detection interface issues in the study of the lithium-ion battery.

Related Dissertations

  1. Preparation and Properties of Silicon Carbon Anode for Lithium Ion Battery,TM912.9
  2. Analysis of Infrared Spectral Features and Identification of Al-responsive Genes in Small Black Soybean with Aluminum Stress,S529
  3. Preparation of Crop Stalk-Based Sorption Materials with High Performances and Their Applications for Pah Removal from Water,X712
  4. Synthesis and Biocompatibility of different types of hydrophilic surface - modified polyurethane,R318.08
  5. Monitoring Leaf Nitrogen Status in Rice with Near Infrared Spectroscopy,S511
  6. Polyaniline / short fiber reinforced natural rubber properties,TQ330.1
  7. Infrared spectroscopy surfactant aqueous two- phase system of,O647.2
  8. Phosphate modification of nano- TiO 2 Photoelectrochemical Properties of the,TB383.1
  9. Construction of Multi-responsive Gene Vector Via Layer-by-Layer Assembly,TB383.1
  10. Study on Laser Surface Modification of Two Kinds of Super-alloys,TG174.4
  11. Atmospheric Pressure Plasma Surface Modification of Carbom Fibers and Numerical Simulation of the Discharge,TQ342.742
  12. Study on Modification of PBO Fibers by Atmospheric Pressure Plasma,TS195.6
  13. Synthesis and Modification of Cathode Materials LiFePO4 and Li2FeSiO4 for Lithium Ion Battery,TM912
  14. Experimental Study on the Ethylene/air Diffusion Flame Based on Near-infrared Emission Spectrometry Measurement,TK16
  15. Synthesis and Modification of Nano LiFePO4 as Cathode Materials,TM912
  16. Study on Synthesis and Modified of LiFePO4 as Cathode Materials,TM912
  17. Surface Modification of Poly (ε-caprolactone)s and Its Influence on Cell Behaviour,R318.08
  18. Stainless steel fuel cell bipolar plate and its experimental and simulation,TM911.4
  19. Nuclear Power Plant Steel Milling Surface Integrity Study,TG54
  20. Instrument-to-Instrument Calibration Transfer and Standardization of Spectra,O657.33
  21. Impact aerobic granular sludge formation and structural stability of the key components of extracellular polymer research,X703

CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells
© 2012 www.DissertationTopic.Net  Mobile