Synthesis, Structure, and Electrochemical Performance of High Capacity Li2Cu0.5Ni0.5O2 Cathodes

Rose E. Ruther; Hui Zhou; Chetan Dhital; Kuppan Saravanan; Andrew K. Kercher; Guoying Chen; Ashfia Huq; Frank M. Delnick; Jagjit Nanda

doi:10.1021/acs.chemmater.5b02843

Synthesis, Structure, and Electrochemical Performance of High Capacity Li₂Cu_0.5Ni_0.5O₂ Cathodes

Rose E. Ruther, Hui Zhou, Chetan Dhital, Kuppan Saravanan, Andrew K. Kercher, Guoying Chen, Ashfia Huq, Frank M. Delnick, Jagjit Nanda

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Abstract

Orthorhombic Li₂NiO₂, Li₂CuO₂, and solid solutions thereof have been studied as potential cathode materials for lithium-ion batteries due to their high theoretical capacity and relatively low cost. While neither endmember shows good cycling stability, the intermediate composition, Li₂Cu_0.5Ni_0.5O₂, yields reasonably high reversible capacities. A new synthetic approach and detailed characterization of this phase and the parent Li₂CuO₂ are presented. The cycle life of Li₂Cu_0.5Ni_0.5O₂ is shown to depend critically on the voltage window. The formation of Cu¹⁺ at low voltage and oxygen evolution at high voltage limit the electrochemical reversibility. In situ X-ray absorption spectroscopy (XAS), in situ Raman spectroscopy, and gas evolution measurements are used to follow the chemical and structural changes that occur as a function of cell voltage.

Original language	English
Pages (from-to)	6746-6754
Number of pages	9
Journal	Chemistry of Materials
Volume	27
Issue number	19
DOIs	https://doi.org/10.1021/acs.chemmater.5b02843
State	Published - Sep 8 2015

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U.S. Department of Energy

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10.1021/acs.chemmater.5b02843

Cite this

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title = "Synthesis, Structure, and Electrochemical Performance of High Capacity Li2Cu0.5Ni0.5O2 Cathodes",

abstract = "Orthorhombic Li2NiO2, Li2CuO2, and solid solutions thereof have been studied as potential cathode materials for lithium-ion batteries due to their high theoretical capacity and relatively low cost. While neither endmember shows good cycling stability, the intermediate composition, Li2Cu0.5Ni0.5O2, yields reasonably high reversible capacities. A new synthetic approach and detailed characterization of this phase and the parent Li2CuO2 are presented. The cycle life of Li2Cu0.5Ni0.5O2 is shown to depend critically on the voltage window. The formation of Cu1+ at low voltage and oxygen evolution at high voltage limit the electrochemical reversibility. In situ X-ray absorption spectroscopy (XAS), in situ Raman spectroscopy, and gas evolution measurements are used to follow the chemical and structural changes that occur as a function of cell voltage.",

author = "Ruther, {Rose E.} and Hui Zhou and Chetan Dhital and Kuppan Saravanan and Kercher, {Andrew K.} and Guoying Chen and Ashfia Huq and Delnick, {Frank M.} and Jagjit Nanda",

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AU - Ruther, Rose E.

AU - Zhou, Hui

AU - Dhital, Chetan

AU - Saravanan, Kuppan

AU - Kercher, Andrew K.

AU - Chen, Guoying

AU - Huq, Ashfia

AU - Delnick, Frank M.

AU - Nanda, Jagjit

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Y1 - 2015/9/8

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AB - Orthorhombic Li2NiO2, Li2CuO2, and solid solutions thereof have been studied as potential cathode materials for lithium-ion batteries due to their high theoretical capacity and relatively low cost. While neither endmember shows good cycling stability, the intermediate composition, Li2Cu0.5Ni0.5O2, yields reasonably high reversible capacities. A new synthetic approach and detailed characterization of this phase and the parent Li2CuO2 are presented. The cycle life of Li2Cu0.5Ni0.5O2 is shown to depend critically on the voltage window. The formation of Cu1+ at low voltage and oxygen evolution at high voltage limit the electrochemical reversibility. In situ X-ray absorption spectroscopy (XAS), in situ Raman spectroscopy, and gas evolution measurements are used to follow the chemical and structural changes that occur as a function of cell voltage.

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