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Title: Nanorod and Nanoparticle Shells in Concentration Gradient Core-Shell Lithium Oxides for Rechargeable Lithium Batteries

Journal Article · · ChemSusChem
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The structure, electrochemistry, and thermal stability of concentration gradient core–shell (CGCS) particles with different shell morphologies were evaluated and compared. We modified the shell morphology from nanoparticles to nanorods, because nanorods can result in a reduced surface area of the shell such that the outer shell would have less contact with the corrosive electrolyte, resulting in improved electrochemical properties. Electron microscopy studies coupled with electron probe X-ray micro-analysis revealed the presence of a concentration gradient shell consisting of nanoparticles and nanorods before and after thermal lithiation at high temperature. Rietveld refinement of the X-ray diffraction data and the chemical analysis results showed no variations of the lattice parameters and chemical compositions of both produced CGCS particles except for the degree of cation mixing (or exchange) in Li and transition metal layers. As anticipated, the dense nanorods present in the shell gave rise to a high tap density (2.5 g cm3 ) with a reduced pore volume and surface area. Intimate contact among the nanorods is likely to improve the resulting electric conductivity. As a result, the CGCS Li[Ni0.60Co0.15Mn0.25]O2 with the nanorod shell retained approximately 85.5% of its initial capacity over 150 cycles in the range of 2.7–4.5 V at 608C. The charged electrode consisting of Li0.16[Ni0.60Co0.15Mn0.25]O2 CGCS particles with the nanorod shell also displayed a main exothermic reaction at 279.48C releasing 751.7 J g1 of heat. Due to the presence of the nanorod shell in the CGCS particles, the electrochemical and thermal properties are substantially superior to those of the CGCS particles with the nanoparticle shell.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Korea Institute of Energy Technology Evaluation and Planning (KETEP); National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1392038
Journal Information:
ChemSusChem, Vol. 7, Issue 12; ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English

References (16)

Synthesis of LiNi 0.5 Mn 0.5- x Ti x O 2 by an Emulsion Drying Method and Effect of Ti on Structure and Electrochemical Properties journal May 2005
Novel Core−Shell-Structured Li[(Ni 0.8 Co 0.2 ) 0.8 (Ni 0.5 Mn 0.5 ) 0.2 ]O 2 via Coprecipitation as Positive Electrode Material for Lithium Secondary Batteries journal April 2006
Aluminum-doped lithium nickel cobalt oxide electrodes for high-power lithium-ion batteries journal April 2004
High-voltage performance of concentration-gradient Li[Ni0.67Co0.15Mn0.18]O2 cathode material for lithium-ion batteries journal December 2010
Synthesis and electrochemical properties of Li[Ni0.8Co0.1Mn0.1]O2 and Li[Ni0.8Co0.2]O2 via co-precipitation journal September 2006
Synthetic optimization of Li[Ni1/3Co1/3Mn1/3]O2 via co-precipitation journal December 2004
Electrochemical and Thermal Behavior of LiNi[sub 1−z]M[sub z]O[sub 2] (M = Co, Mn, Ti) journal January 1997
High-energy cathode material for long-life and safe lithium batteries journal March 2009
Synthesis of Spherical Nano- to Microscale Core−Shell Particles Li[(Ni 0.8 Co 0.1 Mn 0.1 ) 1 - x (Ni 0.5 Mn 0.5 ) x ]O 2 and Their Applications to Lithium Batteries journal October 2006
Layered Li[Ni[sub x]Co[sub 1−2x]Mn[sub x]]O[sub 2] Cathode Materials for Lithium-Ion Batteries journal January 2001
A novel concentration-gradient Li[Ni0.83Co0.07Mn0.10]O2 cathode material for high-energy lithium-ion batteries journal January 2011
Improvement of electrochemical and thermal properties of Li[Ni0.8Co0.1Mn0.1]O2 positive electrode materials by multiple metal (Al, Mg) substitution journal June 2009
Synthesis and Characterization of Li[(Ni 0.8 Co 0.1 Mn 0.1 ) 0.8 (Ni 0.5 Mn 0.5 ) 0.2 ]O 2 with the Microscale Core−Shell Structure as the Positive Electrode Material for Lithium Batteries journal September 2005
Electrochemical analysis for cycle performance and capacity fading of a lithium-ion battery cycled at elevated temperature journal October 2002
Layered Lithium Insertion Material of LiNi 1/2 Mn 1/2 O 2 : A Possible Alternative to LiCoO 2 for Advanced Lithium-Ion Batteries journal August 2001
Effect of AlF 3 Coating on Thermal Behavior of Chemically Delithiated Li 0.35 [Ni 1/3 Co 1/3 Mn 1/3 ]O 2 journal March 2010

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Related Subjects

batteries
concentration gradient
core-shell
lithium
nanorods
positive electrode
shell