A mechanism for the improved rate capability of cathodes by lithium phosphate surficial films

Ke Sun; Shen J. Dillon

doi:10.1016/j.elecom.2010.12.013

A mechanism for the improved rate capability of cathodes by lithium phosphate surficial films

Research output: Contribution to journal › Article › peer-review

Abstract

A Fire and quench method has been applied to coat LiCoO₂ with a disordered Li₃PO₄ film. The coated LiCoO₂ powders display a 50% increase in power density relative to uncoated powders. The improvement in rate capability is consistent with other observations of similar effects in the LiFePO₄ system. The results suggest a new mechanism that explains the effects in both systems. The rate capability appears to be limited by ionic diffusion in the electrolyte and the power may derive from the surficial films ability to reduce concentration polarization perpendicular to the particles' surfaces.

Original language	English (US)
Pages (from-to)	200-202
Number of pages	3
Journal	Electrochemistry Communications
Volume	13
Issue number	2
DOIs	https://doi.org/10.1016/j.elecom.2010.12.013
State	Published - Feb 2011

Keywords

Electrolyte polarization
High power
LiPO
LiCoO
Surficial film

ASJC Scopus subject areas

Electrochemistry

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10.1016/j.elecom.2010.12.013

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title = "A mechanism for the improved rate capability of cathodes by lithium phosphate surficial films",

abstract = "A Fire and quench method has been applied to coat LiCoO2 with a disordered Li3PO4 film. The coated LiCoO2 powders display a 50% increase in power density relative to uncoated powders. The improvement in rate capability is consistent with other observations of similar effects in the LiFePO4 system. The results suggest a new mechanism that explains the effects in both systems. The rate capability appears to be limited by ionic diffusion in the electrolyte and the power may derive from the surficial films ability to reduce concentration polarization perpendicular to the particles' surfaces.",

keywords = "Electrolyte polarization, High power, LiPO, LiCoO, Surficial film",

author = "Ke Sun and Dillon, {Shen J.}",

note = "Funding Information: The authors would like to acknowledge the generous support of the National Science Foundation Division of Materials Research's Ceramics Program (DMR# 0906874 ). This work was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois, which are partially supported by the U.S. Department of Energy under grants DE-FG02-07ER46453 and DE-FG02-07ER46471.",

year = "2011",

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doi = "10.1016/j.elecom.2010.12.013",

language = "English (US)",

volume = "13",

pages = "200--202",

journal = "Electrochemistry Communications",

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T1 - A mechanism for the improved rate capability of cathodes by lithium phosphate surficial films

AU - Sun, Ke

AU - Dillon, Shen J.

N1 - Funding Information: The authors would like to acknowledge the generous support of the National Science Foundation Division of Materials Research's Ceramics Program (DMR# 0906874 ). This work was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois, which are partially supported by the U.S. Department of Energy under grants DE-FG02-07ER46453 and DE-FG02-07ER46471.

PY - 2011/2

Y1 - 2011/2

N2 - A Fire and quench method has been applied to coat LiCoO2 with a disordered Li3PO4 film. The coated LiCoO2 powders display a 50% increase in power density relative to uncoated powders. The improvement in rate capability is consistent with other observations of similar effects in the LiFePO4 system. The results suggest a new mechanism that explains the effects in both systems. The rate capability appears to be limited by ionic diffusion in the electrolyte and the power may derive from the surficial films ability to reduce concentration polarization perpendicular to the particles' surfaces.

AB - A Fire and quench method has been applied to coat LiCoO2 with a disordered Li3PO4 film. The coated LiCoO2 powders display a 50% increase in power density relative to uncoated powders. The improvement in rate capability is consistent with other observations of similar effects in the LiFePO4 system. The results suggest a new mechanism that explains the effects in both systems. The rate capability appears to be limited by ionic diffusion in the electrolyte and the power may derive from the surficial films ability to reduce concentration polarization perpendicular to the particles' surfaces.

KW - Electrolyte polarization

KW - High power

KW - LiPO

KW - LiCoO

KW - Surficial film

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A mechanism for the improved rate capability of cathodes by lithium phosphate surficial films

Abstract

Keywords

ASJC Scopus subject areas

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