Improved electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material synthesized by citric acid assisted sol-gel method for lithium ion batteries

Suk Woo Lee; Hyungsub Kim; Myeong Seong Kim; Hee Chang Youn; Kisuk Kang; Byung Won Cho; Kwang Chul Roh; Kwang Bum Kim

doi:10.1016/j.jpowsour.2016.03.020

Improved electrochemical performance of LiNi_0.6Co_0.2Mn_0.2O₂ cathode material synthesized by citric acid assisted sol-gel method for lithium ion batteries

Suk Woo Lee, Hyungsub Kim, Myeong Seong Kim, Hee Chang Youn, Kisuk Kang, Byung Won Cho, Kwang Chul Roh, Kwang Bum Kim

Department of Materials Science and Engineering

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

116 Citations (Scopus)

Abstract

A citric acid assisted sol-gel method is employed for synthesizing LiNi_0.6Co_0.2Mn_0.2O₂ for use as a cathode material in lithium-ion batteries. The effects of heat-treatment temperature and oxygen atmosphere on the structural and electrochemical properties of LiNi_0.6Co_0.2Mn_0.2O₂ are investigated, in order to determine optimal conditions for the synthesis of LiNi_0.6Co_0.2Mn_0.2O₂ via the citric acid assisted sol-gel method. In particular, the presence of oxygen in the atmosphere effectively leads to a decrease in the degree of cation mixing and the formation of LiOH and Li₂CO₃ on the surface of LiNi_0.6Co_0.2Mn_0.2O₂. Furthermore, heat-treatment in an oxygen atmosphere improves the uniformity of oxidation state of Ni ions between the surface and bulk. LiNi_0.6Co_0.2Mn_0.2O₂ synthesized by heat-treatment at 850 °C under an oxygen atmosphere shows a discharge capacity of 174 mA h g⁻¹ and 89% capacity retention after 100 cycles. In addition, it shows high rate capability (i.e., 41% capacity retention at 10 C), which is an improved rate performance over a previous report. The results of this study should provide useful information for the synthesis of Ni-rich layered oxides for lithium ion batteries.

Original language	English
Pages (from-to)	261-268
Number of pages	8
Journal	Journal of Power Sources
Volume	315
DOIs	https://doi.org/10.1016/j.jpowsour.2016.03.020
Publication status	Published - 2016 May 31

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) ( NRF-2011-0030542 ). This work was also supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) ( NRF-2011-0030542 ). And this research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( 2015R1A2A2A03006633 ).

Publisher Copyright:
© 2016 Elsevier B.V.

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

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

Access to Document

10.1016/j.jpowsour.2016.03.020

Cite this

@article{7f5856a52e474895853d32d081950638,

title = "Improved electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material synthesized by citric acid assisted sol-gel method for lithium ion batteries",

abstract = "A citric acid assisted sol-gel method is employed for synthesizing LiNi0.6Co0.2Mn0.2O2 for use as a cathode material in lithium-ion batteries. The effects of heat-treatment temperature and oxygen atmosphere on the structural and electrochemical properties of LiNi0.6Co0.2Mn0.2O2 are investigated, in order to determine optimal conditions for the synthesis of LiNi0.6Co0.2Mn0.2O2 via the citric acid assisted sol-gel method. In particular, the presence of oxygen in the atmosphere effectively leads to a decrease in the degree of cation mixing and the formation of LiOH and Li2CO3 on the surface of LiNi0.6Co0.2Mn0.2O2. Furthermore, heat-treatment in an oxygen atmosphere improves the uniformity of oxidation state of Ni ions between the surface and bulk. LiNi0.6Co0.2Mn0.2O2 synthesized by heat-treatment at 850 °C under an oxygen atmosphere shows a discharge capacity of 174 mA h g−1 and 89% capacity retention after 100 cycles. In addition, it shows high rate capability (i.e., 41% capacity retention at 10 C), which is an improved rate performance over a previous report. The results of this study should provide useful information for the synthesis of Ni-rich layered oxides for lithium ion batteries.",

author = "Lee, {Suk Woo} and Hyungsub Kim and Kim, {Myeong Seong} and Youn, {Hee Chang} and Kisuk Kang and Cho, {Byung Won} and Roh, {Kwang Chul} and Kim, {Kwang Bum}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) ( NRF-2011-0030542 ). This work was also supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) ( NRF-2011-0030542 ). And this research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( 2015R1A2A2A03006633 ). Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

month = may,

day = "31",

doi = "10.1016/j.jpowsour.2016.03.020",

language = "English",

volume = "315",

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journal = "Journal of Power Sources",

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TY - JOUR

T1 - Improved electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material synthesized by citric acid assisted sol-gel method for lithium ion batteries

AU - Lee, Suk Woo

AU - Kim, Hyungsub

AU - Kim, Myeong Seong

AU - Youn, Hee Chang

AU - Kang, Kisuk

AU - Cho, Byung Won

AU - Roh, Kwang Chul

AU - Kim, Kwang Bum

N1 - Funding Information: This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) ( NRF-2011-0030542 ). This work was also supported by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) ( NRF-2011-0030542 ). And this research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( 2015R1A2A2A03006633 ). Publisher Copyright: © 2016 Elsevier B.V.

PY - 2016/5/31

Y1 - 2016/5/31

N2 - A citric acid assisted sol-gel method is employed for synthesizing LiNi0.6Co0.2Mn0.2O2 for use as a cathode material in lithium-ion batteries. The effects of heat-treatment temperature and oxygen atmosphere on the structural and electrochemical properties of LiNi0.6Co0.2Mn0.2O2 are investigated, in order to determine optimal conditions for the synthesis of LiNi0.6Co0.2Mn0.2O2 via the citric acid assisted sol-gel method. In particular, the presence of oxygen in the atmosphere effectively leads to a decrease in the degree of cation mixing and the formation of LiOH and Li2CO3 on the surface of LiNi0.6Co0.2Mn0.2O2. Furthermore, heat-treatment in an oxygen atmosphere improves the uniformity of oxidation state of Ni ions between the surface and bulk. LiNi0.6Co0.2Mn0.2O2 synthesized by heat-treatment at 850 °C under an oxygen atmosphere shows a discharge capacity of 174 mA h g−1 and 89% capacity retention after 100 cycles. In addition, it shows high rate capability (i.e., 41% capacity retention at 10 C), which is an improved rate performance over a previous report. The results of this study should provide useful information for the synthesis of Ni-rich layered oxides for lithium ion batteries.

AB - A citric acid assisted sol-gel method is employed for synthesizing LiNi0.6Co0.2Mn0.2O2 for use as a cathode material in lithium-ion batteries. The effects of heat-treatment temperature and oxygen atmosphere on the structural and electrochemical properties of LiNi0.6Co0.2Mn0.2O2 are investigated, in order to determine optimal conditions for the synthesis of LiNi0.6Co0.2Mn0.2O2 via the citric acid assisted sol-gel method. In particular, the presence of oxygen in the atmosphere effectively leads to a decrease in the degree of cation mixing and the formation of LiOH and Li2CO3 on the surface of LiNi0.6Co0.2Mn0.2O2. Furthermore, heat-treatment in an oxygen atmosphere improves the uniformity of oxidation state of Ni ions between the surface and bulk. LiNi0.6Co0.2Mn0.2O2 synthesized by heat-treatment at 850 °C under an oxygen atmosphere shows a discharge capacity of 174 mA h g−1 and 89% capacity retention after 100 cycles. In addition, it shows high rate capability (i.e., 41% capacity retention at 10 C), which is an improved rate performance over a previous report. The results of this study should provide useful information for the synthesis of Ni-rich layered oxides for lithium ion batteries.

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