Cathode performance of olivine-type LiFePO4 synthesized by chemical lithiation

Tomoyuki Shiratsuchi, Shigeto Okada, Jun ichi Yamaki, Shohei Yamashita, Tetsuaki Nishida

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Chemical lithiation with LiI in acetonitrile was performed for amorphous FePO4 synthesized from an equimolar aqueous suspension of iron powder and an aqueous solution of P2O5. An orthorhombic LiFePO4 olivine structure was obtained by annealing a chemically lithiated sample at 550 °C for 5 h in Ar atmosphere. The average particle size remained at approximately 250 nm even after annealing. The lithium content in the sample was quantitatively confirmed by Li atomic absorption analysis and 57Fe Mössbauer spectroscopy. While an amorphous FePO4/carbon composite cathode has a monotonously decreasing charge-discharge profile with a reversible capacity of more than 140 mAh g-1, the crystallized LiFePO4/carbon composite shows a 3.4 V plateau corresponding to a two-phase reaction. This means that the lithium in the chemically lithiated sample is electrochemically active. Both amorphous FePO4 and the chemically lithiated and annealed crystalline LiFePO4 cathode materials showed good cyclability (more than 140 mAh g-1 at the 40th cycle) and good discharge rate capability (more than 100 mAh g-1 at 5.0 mA cm-2). In addition, the fast-charge performance was found to be comparable to that with LiCoO2.

Original languageEnglish
Pages (from-to)979-984
Number of pages6
JournalJournal of Power Sources
Volume173
Issue number2 SPEC. ISS.
DOIs
Publication statusPublished - Nov 15 2007

Fingerprint

Olivine
olivine
phosphorus pentoxide
Lithium
Cathodes
cathodes
Annealing
Iron powder
Amorphous carbon
Composite materials
lithium
Acetonitrile
annealing
composite materials
carbon
Particle size
Spectroscopy
Crystalline materials
Carbon
acetonitrile

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Cathode performance of olivine-type LiFePO4 synthesized by chemical lithiation. / Shiratsuchi, Tomoyuki; Okada, Shigeto; Yamaki, Jun ichi; Yamashita, Shohei; Nishida, Tetsuaki.

In: Journal of Power Sources, Vol. 173, No. 2 SPEC. ISS., 15.11.2007, p. 979-984.

Research output: Contribution to journalArticle

Shiratsuchi, T, Okada, S, Yamaki, JI, Yamashita, S & Nishida, T 2007, 'Cathode performance of olivine-type LiFePO4 synthesized by chemical lithiation', Journal of Power Sources, vol. 173, no. 2 SPEC. ISS., pp. 979-984. https://doi.org/10.1016/j.jpowsour.2007.08.038
Shiratsuchi, Tomoyuki ; Okada, Shigeto ; Yamaki, Jun ichi ; Yamashita, Shohei ; Nishida, Tetsuaki. / Cathode performance of olivine-type LiFePO4 synthesized by chemical lithiation. In: Journal of Power Sources. 2007 ; Vol. 173, No. 2 SPEC. ISS. pp. 979-984.
@article{20fe043367874dda8ba46707c8fac5e7,
title = "Cathode performance of olivine-type LiFePO4 synthesized by chemical lithiation",
abstract = "Chemical lithiation with LiI in acetonitrile was performed for amorphous FePO4 synthesized from an equimolar aqueous suspension of iron powder and an aqueous solution of P2O5. An orthorhombic LiFePO4 olivine structure was obtained by annealing a chemically lithiated sample at 550 °C for 5 h in Ar atmosphere. The average particle size remained at approximately 250 nm even after annealing. The lithium content in the sample was quantitatively confirmed by Li atomic absorption analysis and 57Fe M{\"o}ssbauer spectroscopy. While an amorphous FePO4/carbon composite cathode has a monotonously decreasing charge-discharge profile with a reversible capacity of more than 140 mAh g-1, the crystallized LiFePO4/carbon composite shows a 3.4 V plateau corresponding to a two-phase reaction. This means that the lithium in the chemically lithiated sample is electrochemically active. Both amorphous FePO4 and the chemically lithiated and annealed crystalline LiFePO4 cathode materials showed good cyclability (more than 140 mAh g-1 at the 40th cycle) and good discharge rate capability (more than 100 mAh g-1 at 5.0 mA cm-2). In addition, the fast-charge performance was found to be comparable to that with LiCoO2.",
author = "Tomoyuki Shiratsuchi and Shigeto Okada and Yamaki, {Jun ichi} and Shohei Yamashita and Tetsuaki Nishida",
year = "2007",
month = "11",
day = "15",
doi = "10.1016/j.jpowsour.2007.08.038",
language = "English",
volume = "173",
pages = "979--984",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",
number = "2 SPEC. ISS.",

}

TY - JOUR

T1 - Cathode performance of olivine-type LiFePO4 synthesized by chemical lithiation

AU - Shiratsuchi, Tomoyuki

AU - Okada, Shigeto

AU - Yamaki, Jun ichi

AU - Yamashita, Shohei

AU - Nishida, Tetsuaki

PY - 2007/11/15

Y1 - 2007/11/15

N2 - Chemical lithiation with LiI in acetonitrile was performed for amorphous FePO4 synthesized from an equimolar aqueous suspension of iron powder and an aqueous solution of P2O5. An orthorhombic LiFePO4 olivine structure was obtained by annealing a chemically lithiated sample at 550 °C for 5 h in Ar atmosphere. The average particle size remained at approximately 250 nm even after annealing. The lithium content in the sample was quantitatively confirmed by Li atomic absorption analysis and 57Fe Mössbauer spectroscopy. While an amorphous FePO4/carbon composite cathode has a monotonously decreasing charge-discharge profile with a reversible capacity of more than 140 mAh g-1, the crystallized LiFePO4/carbon composite shows a 3.4 V plateau corresponding to a two-phase reaction. This means that the lithium in the chemically lithiated sample is electrochemically active. Both amorphous FePO4 and the chemically lithiated and annealed crystalline LiFePO4 cathode materials showed good cyclability (more than 140 mAh g-1 at the 40th cycle) and good discharge rate capability (more than 100 mAh g-1 at 5.0 mA cm-2). In addition, the fast-charge performance was found to be comparable to that with LiCoO2.

AB - Chemical lithiation with LiI in acetonitrile was performed for amorphous FePO4 synthesized from an equimolar aqueous suspension of iron powder and an aqueous solution of P2O5. An orthorhombic LiFePO4 olivine structure was obtained by annealing a chemically lithiated sample at 550 °C for 5 h in Ar atmosphere. The average particle size remained at approximately 250 nm even after annealing. The lithium content in the sample was quantitatively confirmed by Li atomic absorption analysis and 57Fe Mössbauer spectroscopy. While an amorphous FePO4/carbon composite cathode has a monotonously decreasing charge-discharge profile with a reversible capacity of more than 140 mAh g-1, the crystallized LiFePO4/carbon composite shows a 3.4 V plateau corresponding to a two-phase reaction. This means that the lithium in the chemically lithiated sample is electrochemically active. Both amorphous FePO4 and the chemically lithiated and annealed crystalline LiFePO4 cathode materials showed good cyclability (more than 140 mAh g-1 at the 40th cycle) and good discharge rate capability (more than 100 mAh g-1 at 5.0 mA cm-2). In addition, the fast-charge performance was found to be comparable to that with LiCoO2.

UR - http://www.scopus.com/inward/record.url?scp=35248892834&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=35248892834&partnerID=8YFLogxK

U2 - 10.1016/j.jpowsour.2007.08.038

DO - 10.1016/j.jpowsour.2007.08.038

M3 - Article

AN - SCOPUS:35248892834

VL - 173

SP - 979

EP - 984

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

IS - 2 SPEC. ISS.

ER -