Research Papers

Structural Evolution and Formation Mechanism of LiNiO2 During High-Temperature Solid-State Synthesis

[+] Author and Article Information
Shiyi Deng

School of Metallurgy and Environment,
Central South University,
Changsha 410083, China;
Department of Chemical Engineering and
Applied Chemistry,
University of Toronto,
Toronto, ON M5S 3E5, Canada

Longlong Xue, Zehua Lin, Yongxiang Chen, Tongxing Lei, Jie Zhu, Jinping Zhang

School of Metallurgy and Environment,
Central South University,
Changsha 410083, China

Yunjiao Li

School of Metallurgy and Environment,
Central South University,
Changsha 410083, China
e-mail: yunjiao_li@csu.edu.cn

Wei Li

School of Metallurgy and Environment,
Central South University,
Changsha 410083, China;
Citic Dameng Mining Industries Limited,
Nanning 530028, China

1The authors contributed equally to the paper.

2Corresponding author.

Manuscript received September 6, 2018; final manuscript received December 23, 2018; published online February 19, 2019. Assoc. Editor: Leela Mohana Reddy Arava.

J. Electrochem. En. Conv. Stor. 16(3), 031004 (Feb 19, 2019) (5 pages) Paper No: JEECS-18-1095; doi: 10.1115/1.4042552 History: Received September 06, 2018; Revised December 23, 2018

The processes and mechanisms of LiNiO2 synthesis during the high-temperature solid state method, using Ni(OH)2 precursor and different lithium salts (Li2CO3 and LiOH), were revealed by the thermal (TG–DTA) and structural (X-ray diffraction (XRD)) analyses. Morphology characterization (scanning electron microscopy (SEM)) and the soluble lithium titration are carried out to support the findings. The results show that the synthetic processes of LiNiO2 generally include raw materials' dehydration, oxidation, and combination; also, the existence of lithium salts makes the oxidation of Ni(OH)2 relatively easier. Comparing the two lithium salts involved in the reactions, LiOH will bring about a transition oxide (Ni8O10) and lower the initial reaction temperature for LiNiO2 generation. In addition, a decent temperature under 800 °C, a preheat treatment in 500–600 °C, and a properly longer heating time are suggested to be significant for obtaining the ideal LiNiO2 materials.

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Fig. 1

TG–DTA curves of the Ni(OH)2 precursor

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Fig. 2

X-ray diffraction patterns of Ni(OH)2 before and after heat-treated at 200–800 °C for 5 h

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Fig. 3

TG–DTA curves for the mixture of Ni(OH)2 and Li2CO3

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Fig. 4

X-ray diffraction patterns for the mixture of the Ni(OH)2 and Li2CO3 after heat-treated at 200–800 °C for 5 h

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Fig. 5

TG–DTA curves for the mixture of Ni(OH)2 and LiOH

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Fig. 8

The soluble lithium analysis of the obtained samples at different temperatures

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Fig. 7

Scanning electron microscopy images for the mixture of the Ni(OH)2 and Li2CO3 heat-treated at (a) 200 °C, (c) 400 °C, (e) 600 °C, (g) 800 °C; the mixture of the Ni(OH)2 and LiOH heat-treated at (b) 200 °C, (d) 400 °C, (f) 600 °C, and (h) 800 °C

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Fig. 6

X-ray diffraction patterns for the mixture of Ni(OH)2 and LiOH after heat-treated at 200–800 °C for 5 h



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