Synthesis, structure, and electrochemical properties of O′3-type monoclinic NaNi0.8Co0.15Al0.05O2 cathode materials for sodium-ion batteries
Literature Information
Pengfei Zhou, Xiaolan Liu, Junying Weng, Li Wang, Xiaozhong Wu, Zhichao Miao, Jinping Zhao, Jin Zhou, Shuping Zhuo
Sodium-ion batteries (SIBs) have shown great promise in stationary energy storage due to the abundance of low-cost sodium and the similar electrochemical mechanism to that of commercial lithium-ion batteries. O3-type layered NaNiO2 is considered as one of the most promising cathode materials for SIBs. However, it suffers from irreversible phase transitions, sluggish kinetics and poor mass-production techniques, incurring rapid capacity fading, poor rate performance and limited practical applications. Herein, a novel O′3-type layered NaNi0.8Co0.15Al0.05O2 with a monoclinic phase structure is synthesized by a scalable co-precipitation method followed by a high-temperature calcination process. The substitution of similar ionic radii and same valence Co3+ and Al3+ for Ni3+ enhances the structural stability and improves the reversibility of phase transitions during (de)sodiation processes. The hierarchical architecture of microspheres and assembling of primary nanocrystals, can provide high compacted density and supply short diffusion paths for sodium ion/electron transport simultaneously. Because of these superior merits, the monoclinic NaNi0.8Co0.15Al0.05O2 microspheres exhibit an initial reversible capacity of 153.9 mA h g−1 with a coulombic efficiency of 89.1% at 0.1C and remarkable capacity retention of 86.7% after 200 cycles at 1C, potentially serving as a high capacity and stable cathode material for SIB applications.
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