Synthesis and electrochemical analysis of vapor-deposited carbon-coated LiFePO4

I. Belharouak, C. Johnson, K. Amine

Research output: Contribution to journalArticle

232 Citations (Scopus)

Abstract

Carbon-coated LiFePO4 electrodes (C-LiFePO4) were prepared by a vapor deposition process. An improvement in the rate performance of C-LiFePO4 in lithium cells over uncoated LiFePO4 was observed. The coating process uses a solid/gas-phase reaction which consists of decomposing propylene gas, as carbon source, inside a reactor containing olivine LiFePO4 material. This process leads not only to the formation of few monolayers of carbon film at the surface of olivine particles but also allows for carbon to be deposited inside the pores of the particles. The amount of carbon deposited on olivine particles was determined by TG analysis to be around 3.4 wt%. The structural and electrochemical properties of an optimized electrode made of carbon-coated olivine without acetylene black additive are presented. Li/(C-LiFePO4) cells, cycled at RT and 37 °C between 2.0 and 4.3 V at a C/3 rate, do not show any sign of capacity fade during the first 70 cycles. The area-specific impedance (ASI) of a cell fabricated with carbon-coated olivine made by our process is much lower than the ASI's of cells made of conventional olivine and that of an olivine/carbon composite material reported here for the purpose of comparison. These characteristics, combined with the low-cost coating technique, make the carbon-coated olivine an attractive safe cathode for lithium-ion batteries.

Original languageEnglish
Pages (from-to)983-988
Number of pages6
JournalElectrochemistry Communications
Volume7
Issue number10
DOIs
Publication statusPublished - 1 Oct 2005
Externally publishedYes

Fingerprint

Olivine
Carbon
Vapors
Electrodes
Gases
Acetylene
Vapor deposition
Coating techniques
LiFePO4
olivine
Carbon films
Electrochemical properties
Lithium
Propylene
Structural properties
Monolayers
Cathodes
Coatings
Composite materials

Keywords

  • Carbon vapor decomposition process
  • Carbon-coated LiFePO

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Synthesis and electrochemical analysis of vapor-deposited carbon-coated LiFePO4 . / Belharouak, I.; Johnson, C.; Amine, K.

In: Electrochemistry Communications, Vol. 7, No. 10, 01.10.2005, p. 983-988.

Research output: Contribution to journalArticle

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abstract = "Carbon-coated LiFePO4 electrodes (C-LiFePO4) were prepared by a vapor deposition process. An improvement in the rate performance of C-LiFePO4 in lithium cells over uncoated LiFePO4 was observed. The coating process uses a solid/gas-phase reaction which consists of decomposing propylene gas, as carbon source, inside a reactor containing olivine LiFePO4 material. This process leads not only to the formation of few monolayers of carbon film at the surface of olivine particles but also allows for carbon to be deposited inside the pores of the particles. The amount of carbon deposited on olivine particles was determined by TG analysis to be around 3.4 wt{\%}. The structural and electrochemical properties of an optimized electrode made of carbon-coated olivine without acetylene black additive are presented. Li/(C-LiFePO4) cells, cycled at RT and 37 °C between 2.0 and 4.3 V at a C/3 rate, do not show any sign of capacity fade during the first 70 cycles. The area-specific impedance (ASI) of a cell fabricated with carbon-coated olivine made by our process is much lower than the ASI's of cells made of conventional olivine and that of an olivine/carbon composite material reported here for the purpose of comparison. These characteristics, combined with the low-cost coating technique, make the carbon-coated olivine an attractive safe cathode for lithium-ion batteries.",
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N2 - Carbon-coated LiFePO4 electrodes (C-LiFePO4) were prepared by a vapor deposition process. An improvement in the rate performance of C-LiFePO4 in lithium cells over uncoated LiFePO4 was observed. The coating process uses a solid/gas-phase reaction which consists of decomposing propylene gas, as carbon source, inside a reactor containing olivine LiFePO4 material. This process leads not only to the formation of few monolayers of carbon film at the surface of olivine particles but also allows for carbon to be deposited inside the pores of the particles. The amount of carbon deposited on olivine particles was determined by TG analysis to be around 3.4 wt%. The structural and electrochemical properties of an optimized electrode made of carbon-coated olivine without acetylene black additive are presented. Li/(C-LiFePO4) cells, cycled at RT and 37 °C between 2.0 and 4.3 V at a C/3 rate, do not show any sign of capacity fade during the first 70 cycles. The area-specific impedance (ASI) of a cell fabricated with carbon-coated olivine made by our process is much lower than the ASI's of cells made of conventional olivine and that of an olivine/carbon composite material reported here for the purpose of comparison. These characteristics, combined with the low-cost coating technique, make the carbon-coated olivine an attractive safe cathode for lithium-ion batteries.

AB - Carbon-coated LiFePO4 electrodes (C-LiFePO4) were prepared by a vapor deposition process. An improvement in the rate performance of C-LiFePO4 in lithium cells over uncoated LiFePO4 was observed. The coating process uses a solid/gas-phase reaction which consists of decomposing propylene gas, as carbon source, inside a reactor containing olivine LiFePO4 material. This process leads not only to the formation of few monolayers of carbon film at the surface of olivine particles but also allows for carbon to be deposited inside the pores of the particles. The amount of carbon deposited on olivine particles was determined by TG analysis to be around 3.4 wt%. The structural and electrochemical properties of an optimized electrode made of carbon-coated olivine without acetylene black additive are presented. Li/(C-LiFePO4) cells, cycled at RT and 37 °C between 2.0 and 4.3 V at a C/3 rate, do not show any sign of capacity fade during the first 70 cycles. The area-specific impedance (ASI) of a cell fabricated with carbon-coated olivine made by our process is much lower than the ASI's of cells made of conventional olivine and that of an olivine/carbon composite material reported here for the purpose of comparison. These characteristics, combined with the low-cost coating technique, make the carbon-coated olivine an attractive safe cathode for lithium-ion batteries.

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