Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi                         0.8                         Co                         0.1                         Mn                         0.1                         O                         2                          Positive Electrode Materials for Lithium-Ion Batteries

Shuang Gao; Yang Tse Cheng; Mona Shirpour

doi:10.1021/acsami.8b19349

Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi _0.8 Co _0.1 Mn _0.1 O ₂ Positive Electrode Materials for Lithium-Ion Batteries

Shuang Gao, Yang Tse Cheng, Mona Shirpour

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

44 Scopus citations

Abstract

The role of cobalt deficiency on the crystal structure, surface chemistry, and electrochemical performance of Ni-rich layered LiNi _0.8 Co _0.1 Mn _0.1 O ₂ (NCM811) positive electrode materials was experimentally studied possibly for the first time. We synthesized pristine and cobalt-deficient NCM811 samples by solid-state reaction. Using a variety of characterization techniques and electrochemical measurements, we show that cobalt nonstoichiometry can suppress Ni ²⁺ /Li ⁺ cation mixing, but can simultaneously promote the formation of oxygen vacancies, leading to rapid capacity fade and inferior rate capability compared to pristine NCM811. This study provides new insights into the effects of cobalt deficiency on the cation mixing and electrochemical performance of a Ni-rich layered NCM compound.

Original language	English
Pages (from-to)	982-989
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	11
Issue number	1
DOIs	https://doi.org/10.1021/acsami.8b19349
State	Published - Jan 9 2019

Bibliographical note

Funding Information:
We acknowledge the support from US National Science Foundation Award (#1355438, Powering the Kentucky Bioeconomy for a Sustainable Future). We are grateful for the partial financial support provided by the Department of Chemical and Materials Engineering at the University of Kentucky. We would like to thank Long Zhang for XPS measurements, Dr. Dali Qian for help with TEM, and Andrew Meyer for proofreading the manuscript.

Publisher Copyright:
© 2018 American Chemical Society.

Keywords

Ni-rich NCM
cation mixing
cobalt deficiency
positive electrode
surface oxygen defects

ASJC Scopus subject areas

Materials Science (all)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/acsami.8b19349

Cite this

Gao, S., Cheng, Y. T., & Shirpour, M. (2019). Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi _0.8 Co _0.1 Mn _0.1 O ₂ Positive Electrode Materials for Lithium-Ion Batteries ACS Applied Materials and Interfaces, 11(1), 982-989. https://doi.org/10.1021/acsami.8b19349

Gao, Shuang ; Cheng, Yang Tse ; Shirpour, Mona. / Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi _0.8 Co _0.1 Mn _0.1 O ₂ Positive Electrode Materials for Lithium-Ion Batteries In: ACS Applied Materials and Interfaces. 2019 ; Vol. 11, No. 1. pp. 982-989.

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title = " Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi 0.8 Co 0.1 Mn 0.1 O 2 Positive Electrode Materials for Lithium-Ion Batteries ",

abstract = " The role of cobalt deficiency on the crystal structure, surface chemistry, and electrochemical performance of Ni-rich layered LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) positive electrode materials was experimentally studied possibly for the first time. We synthesized pristine and cobalt-deficient NCM811 samples by solid-state reaction. Using a variety of characterization techniques and electrochemical measurements, we show that cobalt nonstoichiometry can suppress Ni 2+ /Li + cation mixing, but can simultaneously promote the formation of oxygen vacancies, leading to rapid capacity fade and inferior rate capability compared to pristine NCM811. This study provides new insights into the effects of cobalt deficiency on the cation mixing and electrochemical performance of a Ni-rich layered NCM compound. ",

keywords = "Ni-rich NCM, cation mixing, cobalt deficiency, positive electrode, surface oxygen defects",

author = "Shuang Gao and Cheng, {Yang Tse} and Mona Shirpour",

note = "Funding Information: We acknowledge the support from US National Science Foundation Award (#1355438, Powering the Kentucky Bioeconomy for a Sustainable Future). We are grateful for the partial financial support provided by the Department of Chemical and Materials Engineering at the University of Kentucky. We would like to thank Long Zhang for XPS measurements, Dr. Dali Qian for help with TEM, and Andrew Meyer for proofreading the manuscript. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

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Gao, S, Cheng, YT & Shirpour, M 2019, ' Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi _0.8 Co _0.1 Mn _0.1 O ₂ Positive Electrode Materials for Lithium-Ion Batteries ', ACS Applied Materials and Interfaces, vol. 11, no. 1, pp. 982-989. https://doi.org/10.1021/acsami.8b19349

Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi _0.8 Co _0.1 Mn _0.1 O ₂ Positive Electrode Materials for Lithium-Ion Batteries . / Gao, Shuang; Cheng, Yang Tse; Shirpour, Mona.
In: ACS Applied Materials and Interfaces, Vol. 11, No. 1, 09.01.2019, p. 982-989.

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

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Gao S, Cheng YT, Shirpour M. Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi _0.8 Co _0.1 Mn _0.1 O ₂ Positive Electrode Materials for Lithium-Ion Batteries ACS Applied Materials and Interfaces. 2019 Jan 9;11(1):982-989. doi: 10.1021/acsami.8b19349