Thermodynamic and kinetic analysis for carbothermal reduction process of CoSb alloy powders used as anode for lithium ion batteries

• Published in: Journal of alloys and compounds Vol. 509; no. 28; pp. 7657 - 7661
• Main Authors: Yang, Jianying, Wang, Mengwei, Zhu, Yuntong, Zhao, Hailei, Wang, Ronglin, Chen, Jingbo
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 14.07.2011; Elsevier
• Subjects: Anode; Anodes; Carbon; Carbon dioxide; Carbothermal reduction; Chemistry; CoSb; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Lithium batteries; Lithium ion battery; Lithium-ion batteries; Oxides; Reaction kinetics; Reduction; Synthesis; Thermodynamics; Lithium ion battery; Synthesis; Carbothermal reduction; CoSb; Anode; Electrode production; Carbothermy; Thermogravimetry; Differential thermal analysis; Experimental device; Electrode material; Lithium battery; Electrochemical properties; Reaction mechanism; Thermodynamic analysis; Kinetics; Cobalt antimonides
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2011.04.143

► Carbothermal reduction mechanism of Co 4O 3–Sb 2O 3–C system was clarified based on thermodynamic calculation and kinetic analysis. ► Actually required carbon amount for carbothermal reduction process was suggested. ► Pure CoSb powder was prepared via carbothermal reduction process, which shows high electrochemical performance as anode for lithium ion battery. Thermodynamic calculation and kinetic analysis were performed on the carbothermal reduction process of Co 3O 4–Sb 2O 3–C system to clarify the reaction mechanism and synthesize pure CoSb powder for the anode material of secondary lithium-ion batteries. The addition of carbon amount and thus the purity of CoSb powders were critical to the electrochemical property of CoSb anode. It was revealed that in an inert atmosphere, Co 3O 4 was preferentially reduced to CoO, followed by the reduction of Sb 2O 3 and CoO. CO 2 was the gas product for the reduction of Co 3O 4 and Sb 2O 3, while CO was the gas product for that of CoO. Based on the analysis result, pure CoSb powder without any oxides and residual carbon was synthesized, which showed a higher specific capacity and a lower initial irreversible capacity loss, compared to CoSb sample with residual carbon. This work can be a reference for other carbothermal reduction systems.