Electrochemistry beyond Mn4+ in LixMn1-yLiyO2

A R  Armstrong; P G  Bruce

doi:10.1149/1.1625591

Electrochemistry beyond Mn4+ in LixMn1-yLiyO2

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Abstract

Electrodes based on the layered compounds Li-x[Mn1-yLiy]O-2, y less than or equal to 0.2, have been charged in the electrolyte, 1 m LiPF6 in ethylene carbonate/diethyl carbonate (1:2 v/v). Initially Li+ removal is accompanied by oxidation of Mn3+ to Mn4+. Once all Mn is in the 4+ oxidation state further Li+ removal occurs by two unconventional mechanisms, one involving oxidation of O2- with subsequent O loss (effective removal of Li2O) and the other electrolyte oxidation generating H+ which exchanges for Li+ in the electrode. Although both mechanisms appear to occur at 30 and 55degreesC, the former dominates at both temperatures in contrast to Li2MnO3. (C) 2003 The Electrochemical Society.

Original language	English
Number of pages	4
Journal	Electrochemical and Solid-State Letters
Volume	7
DOIs	https://doi.org/10.1149/1.1625591
Publication status	Published - Jan 2004

Keywords

RECHARGEABLE LITHIUM BATTERIES
MANGANESE OXIDES
ION-EXCHANGE
ELECTRODE
SPINEL
CELLS
LI
PERFORMANCE
MECHANISM
INSERTION

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title = "Electrochemistry beyond Mn4+ in LixMn1-yLiyO2",

abstract = "Electrodes based on the layered compounds Li-x[Mn1-yLiy]O-2, y less than or equal to 0.2, have been charged in the electrolyte, 1 m LiPF6 in ethylene carbonate/diethyl carbonate (1:2 v/v). Initially Li+ removal is accompanied by oxidation of Mn3+ to Mn4+. Once all Mn is in the 4+ oxidation state further Li+ removal occurs by two unconventional mechanisms, one involving oxidation of O2- with subsequent O loss (effective removal of Li2O) and the other electrolyte oxidation generating H+ which exchanges for Li+ in the electrode. Although both mechanisms appear to occur at 30 and 55degreesC, the former dominates at both temperatures in contrast to Li2MnO3. (C) 2003 The Electrochemical Society.",

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doi = "10.1149/1.1625591",

language = "English",

volume = "7",

journal = "Electrochemical and Solid-State Letters",

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T1 - Electrochemistry beyond Mn4+ in LixMn1-yLiyO2

AU - Armstrong, A R

AU - Bruce, P G

PY - 2004/1

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N2 - Electrodes based on the layered compounds Li-x[Mn1-yLiy]O-2, y less than or equal to 0.2, have been charged in the electrolyte, 1 m LiPF6 in ethylene carbonate/diethyl carbonate (1:2 v/v). Initially Li+ removal is accompanied by oxidation of Mn3+ to Mn4+. Once all Mn is in the 4+ oxidation state further Li+ removal occurs by two unconventional mechanisms, one involving oxidation of O2- with subsequent O loss (effective removal of Li2O) and the other electrolyte oxidation generating H+ which exchanges for Li+ in the electrode. Although both mechanisms appear to occur at 30 and 55degreesC, the former dominates at both temperatures in contrast to Li2MnO3. (C) 2003 The Electrochemical Society.

AB - Electrodes based on the layered compounds Li-x[Mn1-yLiy]O-2, y less than or equal to 0.2, have been charged in the electrolyte, 1 m LiPF6 in ethylene carbonate/diethyl carbonate (1:2 v/v). Initially Li+ removal is accompanied by oxidation of Mn3+ to Mn4+. Once all Mn is in the 4+ oxidation state further Li+ removal occurs by two unconventional mechanisms, one involving oxidation of O2- with subsequent O loss (effective removal of Li2O) and the other electrolyte oxidation generating H+ which exchanges for Li+ in the electrode. Although both mechanisms appear to occur at 30 and 55degreesC, the former dominates at both temperatures in contrast to Li2MnO3. (C) 2003 The Electrochemical Society.

KW - RECHARGEABLE LITHIUM BATTERIES

KW - MANGANESE OXIDES

KW - ION-EXCHANGE

KW - ELECTRODE

KW - SPINEL

KW - CELLS

KW - LI

KW - PERFORMANCE

KW - MECHANISM

KW - INSERTION

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DO - 10.1149/1.1625591

M3 - Article

SN - 1099-0062

VL - 7

JO - Electrochemical and Solid-State Letters

JF - Electrochemical and Solid-State Letters

ER -

Electrochemistry beyond Mn4+ in LixMn1-yLiyO2

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