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

Author:

Deng Shiyi1,Xue Longlong2,Li Yunjiao3,Lin Zehua2,Li Wei4,Chen Yongxiang2,Lei Tongxing2,Zhu Jie2,Zhang Jinping2

Affiliation:

1. 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

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

3. School of Metallurgy and Environment, Central South University, Changsha 410083, China e-mail:

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

Abstract

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.

Funder

Science and Technology Department of Guangxi Zhuang Autonomous

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials

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