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Title: Influence of F Content on the Composition of Al-Rich Synthetic Phlogopite: Part II. Probing

Abstract

The influence of F substitution on the local structure of Al in the tetrahedral and octahedral sheets

Authors:
 [1];  [2];  [2];  [3];  [3];  [4];  [4]
  1. (EMSL FACILITY USERS)
  2. (Hanover College)
  3. (8998)
  4. (University of British Columbia)
Publication Date:
Research Org.:
Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Lab. (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15005605
DOE Contract Number:
AC06-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: American Mineralogist; Journal Volume: 88; Journal Issue: 7; Other Information: PBD: 1 Jul 2003
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FLUORINE; CATALYTIC EFFECTS; ALUMINIUM COMPOUNDS; CRYSTAL STRUCTURE; ENVIRONMENTAL MOLECULAR SCIENCES LABORATORY, CORRECTIONS TO TITLE: CAPITALIZATION STANDARDS JW 11/20/03

Citation Formats

Fechtelkord, Michael F., Behrens, Harald, Holtz, Francois, Bretherton, Jeremy L., Fyfe, Colin A., Groat, Lee A., and Raudsepp, Mati. Influence of F Content on the Composition of Al-Rich Synthetic Phlogopite: Part II. Probing. United States: N. p., 2003. Web. doi:10.2138/am-2003-0713.
Fechtelkord, Michael F., Behrens, Harald, Holtz, Francois, Bretherton, Jeremy L., Fyfe, Colin A., Groat, Lee A., & Raudsepp, Mati. Influence of F Content on the Composition of Al-Rich Synthetic Phlogopite: Part II. Probing. United States. doi:10.2138/am-2003-0713.
Fechtelkord, Michael F., Behrens, Harald, Holtz, Francois, Bretherton, Jeremy L., Fyfe, Colin A., Groat, Lee A., and Raudsepp, Mati. 2003. "Influence of F Content on the Composition of Al-Rich Synthetic Phlogopite: Part II. Probing". United States. doi:10.2138/am-2003-0713.
@article{osti_15005605,
title = {Influence of F Content on the Composition of Al-Rich Synthetic Phlogopite: Part II. Probing},
author = {Fechtelkord, Michael F. and Behrens, Harald and Holtz, Francois and Bretherton, Jeremy L. and Fyfe, Colin A. and Groat, Lee A. and Raudsepp, Mati},
abstractNote = {The influence of F substitution on the local structure of Al in the tetrahedral and octahedral sheets},
doi = {10.2138/am-2003-0713},
journal = {American Mineralogist},
number = 7,
volume = 88,
place = {United States},
year = 2003,
month = 7
}
  • Ni-rich layered oxides (LiNi 1-xM xO 2; M=Co, Mn, …) are appealing alternatives to conventional LiCoO 2 as cathodes in Li-ion batteries for automobile and other large-scale applications due to their high theoretical capacity and low cost. However, preparing stoichiometric LiNi 1-xM xO 2 with ordered layer structure and high reversible capacity, has proven difficult due to Ni 2+/Li + cation mixing in octahedral sites. Herein, we report on in-situ studies of synthesis reactions and the associated structural ordering in preparing LiNiO 2 and the Co-substituted variant, LiNi 0.8Co 0.2O 2, thereby gaining insights into synthetic control of the structuremore » and electrochemical properties of Ni-rich layered oxides. Results from this study indicate a direct transformation of the intermediate from the rock salt structure into hexagonal phase, and during the process, Co substitution facilities the nucleation of a Co-rich layered phase at low temperatures and subsequent growth and stabilization of solid solution Li(Ni, Co)O 2 upon heat treatment in a highly oxidation environment. Optimal conditions were identified from the in-situ studies and utilized in obtaining stoichiometric LiNi 0.8Co 0.2O 2 that exhibits high capacity of about 200 mAh/g with excellent retention. The findings shed light on designing Ni-rich layered oxide cathodes with enhanced electrochemical properties through synthetic control of the structural ordering in the materials.« less
  • Cited by 1
  • Ni-rich layered oxides (LiNi1-xMxO2; M = Co, Mn, ...) are appealing alternatives to conventional LiCoO2 as cathodes in Li-ion batteries for automobile and other large-scale applications due to their high theoretical capacity and low cost. However, preparing stoichiometric LiNi1-xMxO2 with ordered layer structure and high reversible capacity, has proven difficult due to cation mixing in octahedral sites. Herein, in situ studies of synthesis reactions and the associated structural ordering in preparing LiNiO2 and the Co-substituted variant, LiNi0.8Co0.2O2, are made, to gain insights into synthetic control of the structure and electrochemical properties of Ni-rich layered oxides. Results from this study indicatemore » a direct transformation of the intermediate from the rock salt structure into hexagonal phase, and during the process, Co substitution facilities the nucleation of a Co-rich layered phase at low temperatures and subsequent growth and stabilization of solid solution Li(Ni, Co)O-2 upon further heat treatment. Optimal conditions are identified from the in situ studies and utilized to obtain stoichiometric LiNi0.8Co0.2O2 that exhibits high capacity (up to 200 mA h g(-1) ) with excellent retention. The findings shed light on designing high performance Ni-rich layered oxide cathodes through synthetic control of the structural ordering in the materials.« less
  • A combination of physicochemical methods has been used in studying the formation of structure and phase composition of the MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/ system, depending on the molybdenum content. Three forms have been established for the states of the active component, and concentration limits have been determined for the formation of these states under the conditions of synthesis.