聚合物辅助生成焦磷酸铌NbP1.8O7用于钠离子电池负极
Amorphous niobium pyrophosphate(NbP1.8O7)as high rate anode of Na-ion batteries
李忠涛 1吕青 1刘涛 2邢涛 2刘海燕2
作者信息
- 1. 中国石油大学(华东)化学化工学院重质油国家重点实验室,山东青岛 266580
- 2. 山东能源集团有限公司,大型煤气化及煤基新材料国家工程研究中心,山东济南 250100
- 折叠
摘要
提出一种利用聚合物合成焦磷酸铌NbP1.8O7 的简易方法,采用聚合物辅助一步煅烧,通过调控含磷聚合物的加入量来制备纯相的焦磷酸铌,调控煅烧升温速率以进一步提高负极材料的无定型化,考察电极材料的电化学性能.结果表明:优化后的电极材料电化学储钠性能优异;制备5℃/min升温速率下的趋于无定形的焦磷酸铌在1000 mA/g的电流密度下循环 5000 圈后可逆放电比容量仍有 164.6 mA·h/g,在 2000 mA/g的大电流密度下循环 5000圈后仍有 101.37 mA·h/g的高可逆比容量.
Abstract
A simple method for the synthesis of niobium pyrophosphate NbP1.8O7 using polymer was proposed.A polymer-as-sisted one-step calcination was used to prepare pure-phase niobium pyrophosphate by regulating the addition amount of phos-phorus-containing polymer.The calcination heating rate was adjusted to further improve the amorphization of the anode mate-rial.Then the electrochemical performance of the electrode material was investigated.The results show that the optimized e-lectrode materials present excellent electrochemical sodium storage performance.Niobium pyrophosphate tends to be more a-morphous at temperature rise rate of 5℃/min and exhibits better electrochemical performance.It has a reversible discharge capacity of 164.6 and 101.37 mA·h/g after 5000 cycles at a current density of 1000 mA/g and 2000 mA/g.
关键词
钠离子电池/负极材料/聚阴离子化合物/焦磷酸铌Key words
Na-ion batteries/anode materials/polyanionic compounds/niobium pyrophosphate引用本文复制引用
基金项目
国家重点研发计划(SQ2022YFE020274)
山东省自然科学基金(ZR2020JQ21)
山东省自然科学基金(ZR2021ZD24)
山东省"泰山学者"项目(tsqn201909062)
中央高校基本科研业务费专项(27RA2304013)
出版年
2024