Enhanced electrochemical performance of Li1.18Ni0.15Co0.15Mn0.52O2 cathode modified with aluminosilicate solid acid

• Published in: Journal of materials science. Materials in electronics Vol. 30; no. 24; pp. 21240 - 21249
• Main Authors: Hu, Fang, Zhang, Dongxu, Cui, Fuhan, Xie, Di, Song, Guihong
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2019; Springer Nature B.V
• Subjects: Acids; Aluminosilicates; Aluminum oxide; Aluminum silicates; Cathodes; Characterization and Evaluation of Materials; Chemistry and Materials Science; Current density; Electric potential; Electrochemical analysis; Electrode materials; Materials Science; Optical and Electronic Materials; Retention; Silicon dioxide; Sol-gel processes; Voltage
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-019-02497-1

Li-rich cathode material Li 1.18 Ni 0.15 Co 0.15 Mn 0.52 O 2 is prepared by a sol–gel method and modified with aluminosilicate solid acid (Al 2 O 3 ·SiO 2 ) via an ultrasonic impregnation process. Compared with the pristine and Al 2 O 3 /SiO 2 -sole-modified counterparts, the Al 2 O 3 ·SiO 2 coating layer with high acid center strength on Li 1.18 Ni 0.15 Co 0.15 Mn 0.52 O 2 material exhibits overall improved electrochemical performance. Galvanostatic charge–discharge tests at the current density of 200 mA g −1 displays the highest capacity retention of 72.5% and voltage retention of 95.1% after 200 cycles for Al 2 O 3 ·SiO 2 -coated material. Meanwhile, a high rate capability of 99.2 mAh g −1 after 300 cycles is obtained with a good retention of 65.7% at the current density of 1 A g −1 . The analysis of dQ/dV plots indicates the strong acid center strength of Al 2 O 3 ·SiO 2 coating layer on Li 1.18 Ni 0.15 Co 0.15 Mn 0.52 O 2 cathode material can be favor of suppressing the voltage decay and reducing the side reactions between the electrode and the electrolyte.