Applied Chemical Engineering

Aluminum doping and lithium tungstate surface coating double effect to improve the cycle stability of lithium-rich manganese-based cathode materials

Xuqiang Ren

School of materials science and engineering, Chang’an University

Donglin Li

School of materials science and engineering, Chang’an University

Zhenzhen Zhao

School of materials science and engineering, Chang’an University

Guangqi Chen

School of materials science and engineering, Chang’an University

Kun Zhao

School of materials science and engineering, Chang’an University

Xiangze Kong

School of materials science and engineering, Chang’an University

Tongxin Li

School of materials science and engineering, Chang’an University

DOI: https://doi.org/10.24294/ace.v5i2.1642

Keywords: Lithium-Ion Battery, Sol-Gel Method, Lithium-Rich Manganese-Based Cathode Material, Li2WO4, Al Doping

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Abstract

Al doped lithium-rich manganese-based Li_1.2Mn_0.54−xAl_xNi_0.13Co_0.13O₂ (x = 0, 0.03) cathode materials for lithium-ion batteries were synthesized with sol-gel method, and then Li₂WO₄ coating was prepared by one-step liquid phase method. The effects of Al doping and Li₂WO₄ coating on the electrochemical properties of lithium-rich manganese-based cathode materials were systematically studied. The results show that Al doping significantly improves the cycle stability of lithium-rich manganese-based cathode material, and the coating Li₂WO₄ significantly improves its magnification performance and the voltage attenuation of discharge plateau. The coating amount of Li₂WO₄ is 5%, and the specific capacity of Li_1.2Mn_0.51Al_0.03Ni_0.13Co_0.13O₂ cathode material is still up to about 110 mAh·g⁻¹ in the charge and discharge voltage range of 2.0-4.8 V and the current density of 1,000 mA·g⁻¹. At the same time, the capacity retention rate of 300 cycles at the current density of 100 mA·g⁻¹ is 78%, and the voltage attenuation of the discharge plateau during the cycle is also significantly reduced. This work provides a new idea for solving the cycle stability and platform voltage attenuation of lithium-ion battery lithium-rich manganese-based cathode materials.

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