Uniform and continuous carbon coated sodium vanadium phosphate cathode materials for sodium-ion battery

作者：Si Lulu; Yuan Zhengqiu; Hu Lei; Zhu Yongchun^*; Qian Yitai

来源：Journal of Power Sources, 2014, 272: 880-885.

DOI：10.1016/j.jpowsour.2014.09.046

• Sodium vanadium phosphate
• Carbon-coated
• Continuous carbon
• Cathode
• Sodium-ion battery

Sodium vanadium phosphate Na3V2(PO4)(3) coated with uniform and continuous carbon film is synthesized by heat treatment of the precursors under C2H2-pyrolysis reducing atmosphere, in which Na3V2(PO4)(3) is formed synchronously with carbon coating. As a cathode material for Na-ion batteries, Na3V2(PO4)(3)/C shows a flat charge plateau at about 3.39 V in the potential window of 2.5-4.0 V versus Na+/Na. The charge capacity of 83.7 mAh g(-1) and discharge capacity of 821 mAh g(-1) can be obtained at a current rate of 1C after 300 cycles and the coulombic efficiency averages 98% throughout. The enhanced electrochemical performance can be contributed to the uniform and continuous carbon layer, which greatly improves the electric conductivity of Na3V2(PO4)(3).

• 出版日期2014-12-25
• 单位山东大学; 中国科学技术大学