Dissertation > Excellent graduate degree dissertation topics show

Synthesis and Modification of LiNixCoyMnzO2Cathode Material for Lithium Battery

Author: LiLong
Tutor: ZhaoShiZuo; ChenNengTong
School: Tsinghua University
Course: Materials Engineering
Keywords: LiNi0.8Co0.1Mn0.1O2 core-shell structure LiNi0.4Co0.2Mn0.4O2 surface modification electrochemical performance
CLC: TM912
Type: Master's thesis
Year: 2012
Downloads: 295
Quote: 0
Read: Download Dissertation


LiNixCoyMnzO2has attracted numerous researchers’ interest for its highspecific capacity, high tap tensity and excellent high temperature performance,and becomes one of the best systems of cathode materials for lithium battery.LiNixCoyMnzO2is usually produced via hydroxide co-precipation method inindustrial process.At the present days, the relative mature production incommercial of this system areLiNi1/3Co1/3Mn1/3O2,LiNi0.4Co0.2Mn0.4O2,LiNi0.5Co0.2Mn0.3O2. The dischargecapacity of these materials can reach160170mAh/g, but there still exists ahuge disparity compared to the theory specific capacity of material.The capacity of high Ni content LiNi0.8Co0.1Mn0.1O2is close to its theoryspecific capacity.However, due to its poor structure stability, the high capacitypotential is hard to fully exploited.So the modification of LiNi0.8Co0.1Mn0.1O2becomes a hot research topic.What’s more, due to the intense corrosion effect ofHF decomposed from LiPF6, which is a main constitute of electrolyte, thedischarge capacity performance of LiNixCoyMnzO2at high rate is poor. Thisproblem could be reduced through surface modification, which can play a roleof protecting and stabling strcture. This passage adopts LiNi0.4Co0.2Mn0.4O2asexample, proving proper surface modification can improve the performance ofLiNi0.4Co0.2Mn0.4O2at high rate.Experiment part of the passage is consisted of two main parts: synthsis ofLi[Ni0.8Co0.1Mn(0.1)]0.4[Ni0.5Co0.2Mn0.3]0.6O2(denoted by LiNi0.62Co0.16Mn0.22O2)with a core-shell structure and the surface modification of LiNi0.4Co0.2Mn0.4O2.First part mainly narratives the synthsis of precuesors vie the hydroxiteco-precititation. The sintering process is definited through TG test. Aftersintered with lithium resource, we obtained the aimedmaterial-LiNi0.62Co0.16Mn0.22O2, the electrochemical performance of whichimproved a lot compared with pure LiNi0.8Co0.1Mn0.1O2. The second part ismainly focused on the surface modification of LiNi0.4Co0.2Mn0.4O2usingSiO2/SnO2, seperately. The best coating amount is definited through electrochemical experiment. The high rate performance of LiNi0.4Co0.2Mn0.4O2is greatly improved after coating0.5wt%SiO2.

Related Dissertations

  1. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  2. Multi-walled Carbon Nanotubes Au _AT_ of Pt, Au _AT_ of Pd core-shell structure of the catalyst preparation and electrochemical properties of,O643.36
  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. Polyaniline / short fiber reinforced natural rubber properties,TQ330.1
  6. Phosphate modification of nano- TiO 2 Photoelectrochemical Properties of the,TB383.1
  7. Preparation and Performances of Aluminum Oxide Coated Zirconia Composite Powders,TB383.3
  8. Surface Modification of Al-alloy for Improving Bonding Strength with Pps and the Corrosion Resistance of Al-alloy,TG174.4
  9. Modification of Poly(Vinylidene Fluoride) Via Atom Transfer Radical Polymerization,TQ325.4
  10. Construction of Multi-responsive Gene Vector Via Layer-by-Layer Assembly,TB383.1
  11. Study on Kevlar Fibers/bismaleimide Resin Composites,TB332
  12. The Study of Li-rich Layered Solid-Solution Cathode Materials for Lithium Ion Batteries,TM912
  13. Optical Bistable Properties in an Nondilute Suspension of Coated Particles Witn Dielectric Anisotropy,O437
  14. Surface Modification of Nanoparticles and the Solvent Effect in This Process,TB383
  15. Progress of Research on the Visible Luminescence Mechanism of ZnO,O472.3
  16. Fabrication and Characterization of Nano-ZnO by PLA in Liquid Solution,TB383.1
  17. Study on Sulfonation Surface Treatment of Plasma Alkali Secondary Battery Separator,TM910.5
  18. Study on Electhode Materials of High Surface Area Activated Carbon with Different Pore Structures for Supercapacitor,TM53
  19. Stress folds regularity and the realization of a large area of ??ordered structures,TB383.1
  20. The Synthesis, Assembly, and Property of Core-shell Structured Noble Metal Nanomaterials,TB383.1
  21. Research on Modification of Nano-CaCO3 Used in Ink by Compound Modification Agent,TB383.1

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