Improved electrochemical performance of Li(Ni0.6Co0.2Mn0.2)O2 at high charging cut-off voltage with Li1.4Al0.4Ti1.6(PO4)3 surface coating

doi:10.1088/1674-1056/28/6/068202

Abstract

Li(Ni_0.6Co_0.2Mn_0.2)O₂ has been surface-modified by the lithium-ion conductor Li_1.4Al_0.4Ti_1.6(PO₄)₃ via a facile mechanical fusion method. The annealing temperature during coating process shows a strong impact on the surface morphology and chemical composition of Li(Ni_0.6Co_0.2Mn_0.2)O₂. The 600-℃ annealed material exhibits the best cyclic stability at high charging cut-off voltage of 4.5 V (versus Li⁺/Li) with the capacity retention of 90.9% after 100 cycles, which is much higher than that of bare material (79%). Moreover, the rate capability and thermal stability are also improved by Li_1.4Al_0.4Ti_1.6(PO₄)₃ coating. The enhanced performance can be attributed to the improved stability of interface between Li(Ni_0.6Co_0.2Mn_0.2)O₂ and electrolyte by Li_1.4Al_0.4Ti_1.6(PO₄)₃ modification. The results of this work provide a possible method to design reliable cathode materials to achieve high energy density and long cycle life.

Keywords: lithium-ion batteries cathode Ni-rich oxide solid electrolyte coating

Received: 19 February 2019
Revised: 18 March 2019
Accepted manuscript online:

PACS:	82.47.Aa	(Lithium-ion batteries)
	82.45.Fk	(Electrodes)

Fund:

Project supported by the National Key Research and Development Program of China (Grant No. 2017YFB0102004), the National Natural Science Foundation of China (Grant No. 51822211), and the State Grid Technology Project, China (Grant No. DG71-17-010).

Corresponding Authors: Jie-Nan Zhang, Xi-Qian Yu
E-mail: jnzhang@iphy.ac.cn;xyu@iphy.ac.cn

Cite this article:

Yi Wang(王怡), Bo-Nan Liu(刘柏男), Ge Zhou(周格), Kai-Hui Nie(聂凯会), Jie-Nan Zhang(张杰男), Xi-Qian Yu(禹习谦), Hong Li(李泓) Improved electrochemical performance of Li(Ni_0.6Co_0.2Mn_0.2)O₂ at high charging cut-off voltage with Li_1.4Al_0.4Ti_1.6(PO₄)₃ surface coating 2019 Chin. Phys. B 28 068202

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Improved electrochemical performance of Li(Ni0.6Co0.2Mn0.2)O2 at high charging cut-off voltage with Li1.4Al0.4Ti1.6(PO4)3 surface coating

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Improved electrochemical performance of Li(Ni_0.6Co_0.2Mn_0.2)O₂ at high charging cut-off voltage with Li_1.4Al_0.4Ti_1.6(PO₄)₃ surface coating