High crystalline Na2Ni[Fe(CN)6] particles for a high-stability and low-temperature sodium-ion batteries cathode

• DOI: 10.1016/j.electacta.2018.11.063
• Publication Date: 2018-11-23T07:30:20Z
• Authors: Xiao-Hang Ma; Yi-Yong Wei; Yao-Dong Wu; Jiao Wang; Wei Jia; Jia-Hao Zhou; Zhen-Fa Zi; Jian-Ming Dai
• Keywords: Coprecipitation; Capacity loss

Abstracts High crystalline Na2Ni[Fe(CN)6] particles are synthesized by a new electrostatic spray assisted coprecipitation method. Their structures and electrochemical properties are analyzed by X-ray powder diffraction, scanning electron microscopy and galvanostatic cell cycling and so on. Given its highly stable structure, the optimized Na2Ni[Fe(CN)6] cathode shows impressive cycling performance with high retention capacity of 89% after 440 cycles at 1 C and excellent rate capability of 56 mAh g−1 at 25 C. In addition, the optimized Na2Ni[Fe(CN)6] cathode achieves superior low temperature performances with retains 87% capacity after 440 cycles at 0 °C and a stable capacity of 54 mAh g−1 can be delivered even at −25 °C after 440 cycles. Such a Na2Ni[Fe(CN)6] sample provides a promising cathode for sodium-ion batteries in large-scale storage systems.