Dissertation > Excellent graduate degree dissertation topics show

Preparation of composite cathode materials for lithium ion batteries LiMn_2O_4

Author: HanJinZuo
Tutor: JiaYongZhong
School: Institute of Qinghai Salt Lake
Course: Inorganic Chemistry
Keywords: LiMn2O4 Composite Technology Modified Wet chemical method Doping Modify
CLC: TM912
Type: Master's thesis
Year: 2004
Downloads: 200
Quote: 2
Read: Download Dissertation

Abstract


Lithium manganese oxide with a high voltage , resource-rich , cheap , environmental pollution and other advantages, is recognized as the most promising cathode material for lithium ion batteries . However, for the disproportionation reaction of manganese and dissolved in the electrolyte loss during charging and discharging spinel LiMn 2 O 4 changes in the structure and the Jahn-Teller effect, etc. causes of the LiMn 2 O 4 capacity fade quite serious. To solve this problem , this paper uses composite technology ( synthesis and optimization of reaction conditions , the combination of doping and surface modification method ) for LiMn 2 O 4 were changed research . The main contents are as follows : First, this paper radius smaller than Mn , MO bond can be large and can effectively stabilize LiMn 2 O 4 spinel structure , inhibition of Jahn- Teller effect as doping elements Co , wet chemical synthesis of Co -doped with good electrochemical properties of LiCo 0.1 Mn 1.9 O 4 . Second, this paper, water-soluble organic compounds as carbon source under hydrothermal conditions in LiCo 0.1 Mn 1.9 O 4 and LiMn 2 O 4 of the surface is uniformly coated with a layer of carbon and thus effectively inhibit the electrode material in direct contact with the electrolyte , reducing the dissolution of Mn in the electrolyte , was improve the LiCo 0.1 Mn 1.9 O 4 and LiMn 2 O 4 of cycle performance . This method LiMn 2 O 4 study provides a practical , green , energy-efficient road of industrialization . Third, the use of boric acid as a gradual annealing coating agent LiCo 0.1 Mn 1.9 O 4 were modified . However, boric acid and LiCo 0.1 Mn 1.9 O 4 reaction melt solid lead LiCo 0.1 Mn 1.9 O 4 room temperature electrochemical performance degradation.

Related Dissertations

  1. Preparation and Photocatalytic Properties for Water Decomposition of Titanate Photocatalyst,O643.36
  2. Study on Detection of Transgenic Ingredients in Genetically Modified Cottonseed Meal and Its Degradation during Feed Processing,S816
  3. Genetically Modified Food Ethics,B82-05
  4. Studies on Construction of Specific Gland Expressional Vector of HLF and Modified Fibroblast Cell Line,Q78
  5. Preparation of One-dimensional Nano TiO2 and Study on the Decolorization of Dyeing Wastewater,TB383.1
  6. An Analysis on Consumers’ Cognition and Attitudes of Genetically Modified Edible Oil,F426.82
  7. Establishment of Transgenic Soybean, Maize and Wheat Informationg Platform and Effect of Transgenic Soybean on Soil Microorganisms,S565.1
  8. First-Principles Studies of Cathode Material LiMO2 （M=Co, Ni, Mn） of Lithium Ion Batteries,TM912
  9. Study on Organic Silicone Modified Epoxy Resins Performance and Preparation of Adhesive,TQ323.5
  10. Catalytic Study of Hydrogen Peroxide Synthesis Directly from H2 and O2,TQ123.6
  11. Research on Novel and Highly Efficient Modified Hybrid CrOx-B/SiO2 Catalyst for Ethylene Polymerization,TQ325.12
  12. Experimental Study on Preparation and Metal Ions Removal Capability of Expanded Graphite,TQ127.11
  13. Electrically Conductive Adhesives Based on Epoxy Resins Modified by Polyimide Powder with Carboxyl Groups,TQ433.437
  14. Preparation of Epoxy Resin Cured with Latent Curing Agent at Moderate Temperature,TQ323.5
  15. The Synthesis and Characterization of the Biodegradable Drug-graft-polyester Elastomer,TQ334.1
  16. Study on the Synthesis and Properties of Organic Silicone Modified Waterborne Polyurethane,TQ323.8
  17. Experimental Research of Chemically Modified Silicate for Mercury Removal from Flue Gas,X773
  18. Investigation of SnTe-Ge2 Sb 2 Te5 and Bi2 Te3 Based Phase-change Materials for Applications of Phase Change Memory,TP333
  19. Study of SiN x -Doped SbTe Phase-Change Materials for Phase-Change Random Access Memory,TP333
  20. Gas hard core sand binder modified gelatin preparation and hardening mechanism of,TG221.1
  21. SBS Content Testing and Quality Evaluation of SBS Modified Asphalt,U414

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