Description

Chapter 1 Introduction

1.1- Motivation: Li-Co-Mn-Ni Oxide Materials

1.2 -Layered and Spinel Structures

1.3 - The Li-Co-Mn-O Face of the Pyramid

1.4- The Li-Mn-Ni-O Face of the Pyramid

1.4.1- Li-Mn-Ni-O Spinel Solid-Solutions

1.4.2- Li-Mn-Ni-O Layered Solid-Solutions

1.4.3- The Co-Existence Region Between the Spinel and Layered Struc-tures

1.5- Structure of this Thesis

Chapter 2 Experimental and Theoretical Considerations

2.1- Sample Preparation.

2.1.1- Synthesis of Combinatorial Samples

2.1.2- Synthesis of Bulk Samples

2.2- X-Ray Diffraction.

2.2.1- High Throughput XRD of Combinatorial Samples

2.2.2- XRD of Bulk Samples

2.3- Fitting of Combinatorial XRD Patterns.

2.4- Methods to Generate the Phase Diagrams

2.5- Electrochemical Tests

2.6- Thermo-Gravimetric Analysis

2.7- Elemental Analysis

2.8- Scanning Electron Microscopy

2.9- Redox Titration

2.10- X-Ray Absorption Spectroscopy

2.11- Helium Pycnometry

2.12- Monte Carlo Simulations

Chapter 3 Optimization of the Synthesis of Combinatorial Samples

3.1- Experimental Design

3.2- TGA Results for Lithium Loss During Synthesis

3.3- XRD Results of Lithium Loss

3.3.1- Combinatorial samples

3.3.2- Combinatorial Samples During Synthesis

3.4- Conclusions Regarding Synthesis of Combinatorial Samples

Chapter 4 Combinatorial Studies in the Li-Co-Mn-O System

4.1- Experimental Design

4.2- Spinel -Layered Co-Existence Region

4.3- LiCoO2 -Li2MnO3

4.4- Monte Carlo Simulation

4.5- Conclusions Regarding the Formation of Layered-Layered Composites intheLi-Co-Mn-O System

Chapter 5 Combinatorial Studies of the Spinel and Rocksalt Re-gions in the Li-Mn-Ni-O System

5.1- Experimental Design

5.3- Rocksalt Single-Phase Region

5.4- Mn2O3 -Spinel Co-Existence Region

5.5- Spinel -Ordered Rocksalt Co-Existence Region

5.6- Conclusions Regarding Spinel and Rocksalt Li-Mn-Ni Oxides

Chapter 6 Combinatorial Studies of Compositions Containing Lay-ered Phases in the Li-Mn-Ni-O System

6.1- Experimental Design

6.2- Single-Phase Layered Region

6.3- Two-Phase Layered-Spinel Region

6.4- Two-Phase Layered-Layered Region

6.5- The R, N, S and M phases

6.6- Three-Phase Regions, Quenched

6.7- Three-Phase Regions, Slow Cooled

6.8- The Upper Boundary of the Layered Region

6.9- Conclusions Regarding Combinatorial Studies of Li-Mn-Ni-O Materials

Chapter 7 Investigations of Bulk Li-Mn-Ni-O Samples to Confirm the Combinatorial Studies

7.1- Motivation

7.2- Experimental Design

7.3- Structural Results

7.4- Electrochemistry of the R, M and N Phases

7.5- Conclusions Based on Bulk Li-Mn-Ni-O Samples

Chapter 8 Layered Materials with Metal Site Vacancies

8.1- Motivation for the Study of Samples near Li2MnO3

8.2- Experimental Design

8.3- Monte Carlo Results

8.4- Vacancy Measurements

8.5- Li Ni1/6 1/6Mn2/3]O2

8.6- Conclusions Regarding Metal Site Vacancies in Li-Mn-Ni-O Materials

Chapter 9 Materials Near the Layered Boundary

9.1- Motivation for Studying LiNi0.5Mn0.5O2

9.2- Experimental Design

9.3- Structural Results

9.4- Monte Carlo Simulation Results

9.5- Electrochemical Measurements

9.6- Li1+x Ni0.5Mn0.5]1-xO2 Series with 0

9.7- Conclusions Regarding Layered-Layered Nano-Composites

Chapter 10 Conclusions and Future Works