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Intermediate Phases in LixFePO4

Published online by Cambridge University Press:  26 February 2011

Atsuo Yamada ,
Shinichi Nishimura ,
Hiroshi Koizumi ,
Ryoji Kanno ,
Shiro Seki ,
Yo Kobayashi ,
Hajime Miyashiro ,
Joanna Dodd ,
Rachid Yazami  and
Brent Fultz
Atsuo Yamada
Affiliation:
yamada@echem.titech.ac.jp, Tokyo Institute of Technology, Electronic Chemistry, G1-4 4259 Nagatsuta, Midori, Yokohama, 226-8502, Japan, +81-45-924-5403, +81-45-924-5403
Shinichi Nishimura
Affiliation:
nishimura@echem.titech.ac.jp, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, 226-8502, Japan
Hiroshi Koizumi
Affiliation:
koizumi@echem.titech.ac.jp, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, 226-8502, Japan
Ryoji Kanno
Affiliation:
kanno@echem.titech.ac.jp, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, 226-8502, Japan
Shiro Seki
Affiliation:
s-seki@criepi.denken.or.jp, Central Research Institute of Electric Power Industry, 2-11-1 Iwadokita, Komae,, Tokyo, 201-8511, Japan
Yo Kobayashi
Affiliation:
kobayo@criepi.denken.or.jp, Central Research Institute of Electric Power Industry, 2-11-1 Iwadokita, Komae,, Tokyo, 201-8511, Japan
Hajime Miyashiro
Affiliation:
h-miyashiro@criepi.denken.or.jp, Central Research Institute of Electric Power Industry, 2-11-1 Iwadokita, Komae,, Tokyo, 201-8511, Japan
Joanna Dodd
Affiliation:
jdodd@caltech.edu, California Institute of Technology, 138-78, Pasadena, CA, 91125, United States
Rachid Yazami
Affiliation:
yazami@caltech.edu, California Institute of Technology, 138-78, Pasadena, CA, 91125, United States
Brent Fultz
Affiliation:
btf@caltech.edu, California Institute of Technology, 138-78, Pasadena, CA, 91125, United States
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Abstract

Rietveld analysis for the time of flight powder neutron diffraction profile for LiFePO4 at room temperature was performed. Refined tensor elements of the unisotropic thermal factor under the elliptic approximation showed the principal axis of the lithium vibration is toward the face shared vacant tetrahedral space and is consistent with the theoretical prediction; lithium ions diffuse along curved one-dementional chain along b-axis. Impact of temperature on the phase diagram of LixFePO4 with > 200nm particle size was slight under the unmixing line around 200 C. While the reduction in particle size down to <100 nm seems to have significant effect to the room temperature miscibility gap. The thermodynamic concepts for the extended solution in smaller particles are discussed, followed by a demonstration of very high rate capability observed for the small spherical particles < 80 nm.

Keywords

intercalationenergy-storagediffusion
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA13-02
Copyright
Copyright © Materials Research Society 2007

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