Effect of cationic and anionic substitutions on the electrochemical properties of LiNi0.5Mn1.5O4 spinel cathode materials

• Published in: Electrochimica acta Vol. 138; pp. 493 - 500
• Main Authors: Zeng, Yan-Ping, Wu, Xing-long, Mei, Peng, Cong, Li-Na, Yao, Cen, Wang, Rong-Shun, Xie, Hai-Ming, Sun, Li-Qun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20.08.2014
• Subjects: Cathode material; Cr-doped; F-doped; LiNi0.5Mn1.5O4; Lithium-ion batteries; Lithium-ion batteries; Cathode material; Cr-doped; LiNi0.5Mn1.5O4; F-doped
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2014.06.082

Cationic and anionic doping in LiNi0.5Mn1.5O4 has been prepared via a solid state method. The effect of substitution on the structure, morphology, and electrochemical properties were investigated. The XRD and Raman results indicate that all synthesized materials have a phase-pure spinel structure with a space group of Fd3m and no obvious impurity phase peaks. Excellent cycle life is measured for these 5V Cr and (or) F-doped electrodes. When the charge/discharge rate returns to 1C after the test of rate capability (0.1-5C), the capacity can be completely recovered and the capacity retention is about 98.6%, 98.8% and 96.2% after 100 cycles for LiNi0.45Cr0.05Mn1.5O4, LiNi0.45Cr0.05Mn1.5O3.9F0.1 and LiNi0.5Mn1.5O3.9F0.1, respectively. Furthermore, rate capability is greatly influenced by the relative content of Mn3+. Cr and (or) F substitutions supply an efficient process to tune the Mn3+ concentration in the lattice.