Degradation Studies on LiFePO4 cathode

Roberto Scipioni; Peter Stanley Jørgensen; Johan Hjelm; Poul Norby; Claus Nygaard Rasmussen; Søren Højgaard Jensen

doi:10.1149/06422.0097ecst

Degradation Studies on LiFePO₄ cathode

Roberto Scipioni, Peter Stanley Jørgensen, Johan Hjelm, Poul Norby, Claus Nygaard Rasmussen, Søren Højgaard Jensen

Research output: Contribution to journal › Conference article › Research › peer-review

Abstract

In this paper we examine a laboratory LiFePO₄ (LFP) cathode and propose a simple model that predicts the electrode capacity as function of C-rate, number of cycles and calendar time. Microcracks were found in Li_1-xFePO₄ particles in a degraded LFP electrode and low-acceleration voltage (1 kV) FIB/SEM analysis allowed us to obtain phase contrast between FePO₄ and LiFePO₄. The evolution of micro-cracks is expected to increase the concentration of LFP particles which are not electronically accessible and thus cause a loss in capacity.

Original language	English
Journal	E C S Transactions
Volume	64
Issue number	22
Pages (from-to)	97-106
ISSN	1938-5862
DOIs	https://doi.org/10.1149/06422.0097ecst
Publication status	Published - 2015
Event	226th Meeting of the Electrochemical Society (ECS) and 7th Meeting of the Mexico Section of the Electrochemical Society ECS and SMEQ Joint International Meeting : Joint international meeting - Cancun, Mexico Duration: 5 Oct 2014 → 9 Oct 2014 Conference number: 226

Conference

Conference	226th Meeting of the Electrochemical Society (ECS) and 7th Meeting of the Mexico Section of the Electrochemical Society ECS and SMEQ Joint International Meeting
Number	226
Country/Territory	Mexico
City	Cancun
Period	05/10/2014 → 09/10/2014

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Cite this

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title = "Degradation Studies on LiFePO4 cathode",

abstract = "In this paper we examine a laboratory LiFePO4 (LFP) cathode and propose a simple model that predicts the electrode capacity as function of C-rate, number of cycles and calendar time. Microcracks were found in Li1-xFePO4 particles in a degraded LFP electrode and low-acceleration voltage (1 kV) FIB/SEM analysis allowed us to obtain phase contrast between FePO4 and LiFePO4. The evolution of micro-cracks is expected to increase the concentration of LFP particles which are not electronically accessible and thus cause a loss in capacity.",

author = "Roberto Scipioni and J{\o}rgensen, {Peter Stanley} and Johan Hjelm and Poul Norby and Rasmussen, {Claus Nygaard} and Jensen, {S{\o}ren H{\o}jgaard}",

year = "2015",

doi = "10.1149/06422.0097ecst",

language = "English",

volume = "64",

pages = "97--106",

journal = "E C S Transactions",

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note = "226th Meeting of the Electrochemical Society (ECS) and 7th Meeting of the Mexico Section of the Electrochemical Society ECS and SMEQ Joint International Meeting : Joint international meeting, 2014 ECS and SMEQ ; Conference date: 05-10-2014 Through 09-10-2014",

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AU - Scipioni, Roberto

AU - Jørgensen, Peter Stanley

AU - Hjelm, Johan

AU - Norby, Poul

AU - Rasmussen, Claus Nygaard

AU - Jensen, Søren Højgaard

N1 - Conference code: 226

PY - 2015

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N2 - In this paper we examine a laboratory LiFePO4 (LFP) cathode and propose a simple model that predicts the electrode capacity as function of C-rate, number of cycles and calendar time. Microcracks were found in Li1-xFePO4 particles in a degraded LFP electrode and low-acceleration voltage (1 kV) FIB/SEM analysis allowed us to obtain phase contrast between FePO4 and LiFePO4. The evolution of micro-cracks is expected to increase the concentration of LFP particles which are not electronically accessible and thus cause a loss in capacity.

AB - In this paper we examine a laboratory LiFePO4 (LFP) cathode and propose a simple model that predicts the electrode capacity as function of C-rate, number of cycles and calendar time. Microcracks were found in Li1-xFePO4 particles in a degraded LFP electrode and low-acceleration voltage (1 kV) FIB/SEM analysis allowed us to obtain phase contrast between FePO4 and LiFePO4. The evolution of micro-cracks is expected to increase the concentration of LFP particles which are not electronically accessible and thus cause a loss in capacity.

U2 - 10.1149/06422.0097ecst

DO - 10.1149/06422.0097ecst

M3 - Conference article

SN - 1938-5862

VL - 64

SP - 97

EP - 106

JO - E C S Transactions

JF - E C S Transactions

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T2 - 226th Meeting of the Electrochemical Society (ECS) and 7th Meeting of the Mexico Section of the Electrochemical Society ECS and SMEQ Joint International Meeting

Y2 - 5 October 2014 through 9 October 2014

ER -