Single-crystal LiNi0.5Co0.2Mn0.3O2: a high thermal and cycling stable cathodes for lithium-ion batteries

• Published in: Journal of materials science Vol. 55; no. 7; pp. 2913 - 2922
• Main Authors: Zhong, Zeqin, Chen, Lingzhen, Huang, Shaozhen, Shang, Weili, Kong, Lingyong, Sun, Ming, Chen, Lei, Ren, Wangbao
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2020; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystal structure; Crystallinity; Crystallography and Scattering Methods; Cycles; Electrochemical analysis; Electrochemical impedance spectroscopy; Energy Materials; Lithium; Lithium-ion batteries; Materials Science; Polymer Sciences; Rechargeable batteries; Single crystals; Solid Mechanics; Thermal decomposition; Thermal stability
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-019-04133-z

Single-crystalline LiNi 0.5 Co 0.2 Mn 0.3 O 2 (denoted as SC-523) with micron size had been successfully synthesized through a facile method. Electrochemical impedance spectroscopy and differential scanning calorimetry were carried out to identify the improved electrochemical performance and desired thermal stability. Even after 100 cycles, SC-523 still delivered a discharge capacity of 151.1 mA h g −1 (capacity retention with 90.3%) at 1 C in voltage range from 3.0 to 4.5 V (vs. Li/Li + ), while polycrystalline spherical LiNi 0.5 Co 0.2 Mn 0.3 O 2 (denoted as PC-523) only exhibited 141.7 mA h g −1 (capacity retention with 78.4%). Besides, SC-523 shows a higher decomposition temperature of 332.13 °C, 14.61 °C higher than that of PC-523 during the thermal decomposition. Consequently, single-crystalline particles with robust morphological integrity ensure the enhanced cycling stability and thermal stability.