Renewable Energy Global Innovations features: Effect of pre-thermal treatment on the lithium storage performance of LiNi0.8Co0.15Al0.05O2

Journal Reference

Journal of Materials Science,  2016, Volume 51, Issue 3, pp 1400-1408.

Zewen Ruan, Yongming Zhu , Xiangguo Teng

Department of Applied Chemistry, Harbin Institute of Technology at Weihai, Wenhua West Road 2#, Weihai, 264209, Shandong Province, China.

Abstract

Layered LiNi_0.8Co_0.15Al_0.05O₂ cathode materials have been synthesized by co-precipitation methods. The effect of pre-thermal treatment was investigated by thermogravimetric differential thermal analysis. Although X-ray diffraction has confirmed that all diffraction peaks in XRD patterns for samples treated at 500 ~ 750 °C can be a well-indexed hexagonal structure, the status of nickel ions varied. Samples pre-treated at different temperatures show different colors and had various contents of Ni³⁺ measured by XPS. Powders that heated again at 800 °C under the condition of dried oxygen for 12 h after pre-thermal treatment show different electrochemical performances, which pre-thermal treated at 600 °C had a highest reversible specific capacity about 180 mAh·g⁻¹and capacity retention of 91.7 % after 50 cycles when cycled at a current density of 0.1 C between 2.5–4.3 V at room temperature. The relationship between the status of nickel ions and electrochemical performance was discussed. On the other hand, the capacity retention rates are 91.7, 96.6, and 98.0 % after 50 cycles at 0.1 C and at 100 %DOD, 80 DOD, and 50 %DOD.

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