Influence on the first charge capacity of layered Li-Mn-O-based electrodes by combining stoichiometric and nonstoichiometric materials

Allan J. Paterson*, Alastair D. Robertson, Peter G. Bruce

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

By forming electrodes consisting of a (1:1) mixture of stoichiometric to nonstoichiometric layered lithium manganese oxides with the O3 structure, illustrated specifically by combining LiMnO2 and Li 0.57Mn0.88Li0.025Co0.023O 2, it is possible to obtain a 4% higher charge than discharge capacity on the first cycle, at a rate of C/8 and voltage limits of 2.4-4.6 V. A (2:1) mixture (stoichiometric:nonstoichiometric) exhibits an excess capacity on the first charge of 24% under the same conditions. Both ratios show very similar charge/discharge profiles on subsequent cycles. The fade rates at higher cycle number are greater than for the nonstoichiometric material alone. The approach, of combining stoichiometric and nonstoichiometric layered lithium managaese oxides with the 03 structure, can be extended to any of the wide range of nonstoichiometric LixMnyO2 compounds, whether or not doped with a range of other ions.

Original languageEnglish
Pages (from-to)A331-A335
Number of pages5
JournalElectrochemical and Solid-State Letters
Volume7
Issue number10
Early online date7 Sep 2004
DOIs
Publication statusPublished - 22 Nov 2004
Externally publishedYes

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Lithium
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Oxides
manganese oxides
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electric potential
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Cite this

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title = "Influence on the first charge capacity of layered Li-Mn-O-based electrodes by combining stoichiometric and nonstoichiometric materials",
abstract = "By forming electrodes consisting of a (1:1) mixture of stoichiometric to nonstoichiometric layered lithium manganese oxides with the O3 structure, illustrated specifically by combining LiMnO2 and Li 0.57Mn0.88Li0.025Co0.023O 2, it is possible to obtain a 4{\%} higher charge than discharge capacity on the first cycle, at a rate of C/8 and voltage limits of 2.4-4.6 V. A (2:1) mixture (stoichiometric:nonstoichiometric) exhibits an excess capacity on the first charge of 24{\%} under the same conditions. Both ratios show very similar charge/discharge profiles on subsequent cycles. The fade rates at higher cycle number are greater than for the nonstoichiometric material alone. The approach, of combining stoichiometric and nonstoichiometric layered lithium managaese oxides with the 03 structure, can be extended to any of the wide range of nonstoichiometric LixMnyO2 compounds, whether or not doped with a range of other ions.",
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year = "2004",
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Influence on the first charge capacity of layered Li-Mn-O-based electrodes by combining stoichiometric and nonstoichiometric materials. / Paterson, Allan J.; Robertson, Alastair D.; Bruce, Peter G.

In: Electrochemical and Solid-State Letters, Vol. 7, No. 10, 22.11.2004, p. A331-A335.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence on the first charge capacity of layered Li-Mn-O-based electrodes by combining stoichiometric and nonstoichiometric materials

AU - Paterson, Allan J.

AU - Robertson, Alastair D.

AU - Bruce, Peter G.

PY - 2004/11/22

Y1 - 2004/11/22

N2 - By forming electrodes consisting of a (1:1) mixture of stoichiometric to nonstoichiometric layered lithium manganese oxides with the O3 structure, illustrated specifically by combining LiMnO2 and Li 0.57Mn0.88Li0.025Co0.023O 2, it is possible to obtain a 4% higher charge than discharge capacity on the first cycle, at a rate of C/8 and voltage limits of 2.4-4.6 V. A (2:1) mixture (stoichiometric:nonstoichiometric) exhibits an excess capacity on the first charge of 24% under the same conditions. Both ratios show very similar charge/discharge profiles on subsequent cycles. The fade rates at higher cycle number are greater than for the nonstoichiometric material alone. The approach, of combining stoichiometric and nonstoichiometric layered lithium managaese oxides with the 03 structure, can be extended to any of the wide range of nonstoichiometric LixMnyO2 compounds, whether or not doped with a range of other ions.

AB - By forming electrodes consisting of a (1:1) mixture of stoichiometric to nonstoichiometric layered lithium manganese oxides with the O3 structure, illustrated specifically by combining LiMnO2 and Li 0.57Mn0.88Li0.025Co0.023O 2, it is possible to obtain a 4% higher charge than discharge capacity on the first cycle, at a rate of C/8 and voltage limits of 2.4-4.6 V. A (2:1) mixture (stoichiometric:nonstoichiometric) exhibits an excess capacity on the first charge of 24% under the same conditions. Both ratios show very similar charge/discharge profiles on subsequent cycles. The fade rates at higher cycle number are greater than for the nonstoichiometric material alone. The approach, of combining stoichiometric and nonstoichiometric layered lithium managaese oxides with the 03 structure, can be extended to any of the wide range of nonstoichiometric LixMnyO2 compounds, whether or not doped with a range of other ions.

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