Electrochemical performances of 0.9Li2MnO3-0. 1Li(Mn0.375Ni0.375Co0.25)O2 cathodes: Role of the cycling induced layered to spinel phase transformation

C. Ghanty; R. N. Basu; S. B. Majumder

doi:10.1016/j.ssi.2013.12.032

Electrochemical performances of 0.9Li₂MnO₃-0. 1Li(Mn_0.375Ni_0.375Co_0.25)O₂ cathodes: Role of the cycling induced layered to spinel phase transformation

C. Ghanty, R. N. Basu, S. B. Majumder

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

28 Scopus citations

Abstract

In the present work, we have reported that as compared to Li ₂MnO₃ lean compositions, the electrochemical properties of Li₂MnO₃ rich integrated cathodes (viz. 0.9Li ₂MnO₃-0.1Li(Mn_0.375Ni_0.375Co _0.25)O₂) are singular in three different ways. First, unlike its Li₂MnO₃ lean counterparts, the oxygen and concomitant lithium extraction in Li₂MnO₃ rich composition (viz. Li(Li_0.31Mn_0.646Ni_0.026Co _0.017)O₂) continues beyond first charging cycle. Second, for Li₂MnO₃ rich compositions, layered to spinel phase transformation seems to be unavoidable with repeated charge-discharge cycling. Formation of spinel phase triggers capacity fading in these cathodes. We have found that for these cathodes, galvanostatic cycling at relatively higher rate (> 20 mA g^{- 1}) retards the spinel formation with concomitant improvement of capacity retention with cycling. Finally, for Li ₂MnO₃ rich integrated cathodes the major capacity contribution is found to be due to the reversible manganese redox (∼ 3 V and ∼ 2.6 V). Therefore, the energy densities of these cathodes are less as compared to Li₂MnO₃ lean compositions.

Original language	English
Pages (from-to)	19-28
Number of pages	10
Journal	Solid State Ionics
Volume	256
DOIs	https://doi.org/10.1016/j.ssi.2013.12.032
State	Published - 1 Mar 2014
Externally published	Yes

Bibliographical note

Funding Information:
The research work was partially supported by the equipment grant from the Alexander von Humboldt Foundation, Bonn, Germany . One of the authors, Mr. C. Ghanty, would also like to acknowledge CSIR, Govt. of India for providing him a Research Fellowship under CSIR-NET scheme.

Funding

The research work was partially supported by the equipment grant from the Alexander von Humboldt Foundation, Bonn, Germany . One of the authors, Mr. C. Ghanty, would also like to acknowledge CSIR, Govt. of India for providing him a Research Fellowship under CSIR-NET scheme.

Funders	Funder number
CSIR-NET
Alexander von Humboldt-Stiftung

Keywords

Chemical synthesis
Electrochemical properties
Integrated cathode material
Layered to spinel phase transformation
Lithium rechargeable battery

Access to Document

10.1016/j.ssi.2013.12.032

Cite this

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title = "Electrochemical performances of 0.9Li2MnO3-0. 1Li(Mn0.375Ni0.375Co0.25)O2 cathodes: Role of the cycling induced layered to spinel phase transformation",

abstract = "In the present work, we have reported that as compared to Li 2MnO3 lean compositions, the electrochemical properties of Li2MnO3 rich integrated cathodes (viz. 0.9Li 2MnO3-0.1Li(Mn0.375Ni0.375Co 0.25)O2) are singular in three different ways. First, unlike its Li2MnO3 lean counterparts, the oxygen and concomitant lithium extraction in Li2MnO3 rich composition (viz. Li(Li0.31Mn0.646Ni0.026Co 0.017)O2) continues beyond first charging cycle. Second, for Li2MnO3 rich compositions, layered to spinel phase transformation seems to be unavoidable with repeated charge-discharge cycling. Formation of spinel phase triggers capacity fading in these cathodes. We have found that for these cathodes, galvanostatic cycling at relatively higher rate (> 20 mA g- 1) retards the spinel formation with concomitant improvement of capacity retention with cycling. Finally, for Li 2MnO3 rich integrated cathodes the major capacity contribution is found to be due to the reversible manganese redox (∼ 3 V and ∼ 2.6 V). Therefore, the energy densities of these cathodes are less as compared to Li2MnO3 lean compositions.",

keywords = "Chemical synthesis, Electrochemical properties, Integrated cathode material, Layered to spinel phase transformation, Lithium rechargeable battery",

author = "C. Ghanty and Basu, {R. N.} and Majumder, {S. B.}",

note = "Funding Information: The research work was partially supported by the equipment grant from the Alexander von Humboldt Foundation, Bonn, Germany . One of the authors, Mr. C. Ghanty, would also like to acknowledge CSIR, Govt. of India for providing him a Research Fellowship under CSIR-NET scheme.",

year = "2014",

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doi = "10.1016/j.ssi.2013.12.032",

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T1 - Electrochemical performances of 0.9Li2MnO3-0. 1Li(Mn0.375Ni0.375Co0.25)O2 cathodes

T2 - Role of the cycling induced layered to spinel phase transformation

AU - Ghanty, C.

AU - Basu, R. N.

AU - Majumder, S. B.

N1 - Funding Information: The research work was partially supported by the equipment grant from the Alexander von Humboldt Foundation, Bonn, Germany . One of the authors, Mr. C. Ghanty, would also like to acknowledge CSIR, Govt. of India for providing him a Research Fellowship under CSIR-NET scheme.

PY - 2014/3/1

Y1 - 2014/3/1

N2 - In the present work, we have reported that as compared to Li 2MnO3 lean compositions, the electrochemical properties of Li2MnO3 rich integrated cathodes (viz. 0.9Li 2MnO3-0.1Li(Mn0.375Ni0.375Co 0.25)O2) are singular in three different ways. First, unlike its Li2MnO3 lean counterparts, the oxygen and concomitant lithium extraction in Li2MnO3 rich composition (viz. Li(Li0.31Mn0.646Ni0.026Co 0.017)O2) continues beyond first charging cycle. Second, for Li2MnO3 rich compositions, layered to spinel phase transformation seems to be unavoidable with repeated charge-discharge cycling. Formation of spinel phase triggers capacity fading in these cathodes. We have found that for these cathodes, galvanostatic cycling at relatively higher rate (> 20 mA g- 1) retards the spinel formation with concomitant improvement of capacity retention with cycling. Finally, for Li 2MnO3 rich integrated cathodes the major capacity contribution is found to be due to the reversible manganese redox (∼ 3 V and ∼ 2.6 V). Therefore, the energy densities of these cathodes are less as compared to Li2MnO3 lean compositions.

AB - In the present work, we have reported that as compared to Li 2MnO3 lean compositions, the electrochemical properties of Li2MnO3 rich integrated cathodes (viz. 0.9Li 2MnO3-0.1Li(Mn0.375Ni0.375Co 0.25)O2) are singular in three different ways. First, unlike its Li2MnO3 lean counterparts, the oxygen and concomitant lithium extraction in Li2MnO3 rich composition (viz. Li(Li0.31Mn0.646Ni0.026Co 0.017)O2) continues beyond first charging cycle. Second, for Li2MnO3 rich compositions, layered to spinel phase transformation seems to be unavoidable with repeated charge-discharge cycling. Formation of spinel phase triggers capacity fading in these cathodes. We have found that for these cathodes, galvanostatic cycling at relatively higher rate (> 20 mA g- 1) retards the spinel formation with concomitant improvement of capacity retention with cycling. Finally, for Li 2MnO3 rich integrated cathodes the major capacity contribution is found to be due to the reversible manganese redox (∼ 3 V and ∼ 2.6 V). Therefore, the energy densities of these cathodes are less as compared to Li2MnO3 lean compositions.

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