无机盐工业 ›› 2023, Vol. 55 ›› Issue (12): 66-73.doi: 10.19964/j.issn.1006-4990.2023-0055
收稿日期:
2023-02-07
出版日期:
2023-12-10
发布日期:
2023-12-14
通讯作者:
罗冬梅(1969— )女,教授,研究方向为矿物绿色加工、低品位矿及固废低碳资源化利用和储能材料;E-mail:dmluo@scu.edu.cn。作者简介:
张瑞(1996— ),女,硕士,研究方向为钠离子电池负极材料钛酸钠的制备及电化学性能研究;E-mail:2515541008@qq.com。
基金资助:
ZHANG Rui(), WANG Zhenghao, CHEN Liang, GUO Xiaodong, LUO Dongmei()
Received:
2023-02-07
Published:
2023-12-10
Online:
2023-12-14
摘要:
采用传统方法制备钛酸钠材料时,所使用的钛源(如TiO2,四异丙醇钛等)均为分析纯试剂,由含钛矿物经过多道工序加工获得,导致成本较高且制备钛酸钠的流程冗长。以工业钛液为原料,通过常压水解制备的偏钛酸前驱体为钛源,使用高温固相法合成了钛酸钠负极材料,缩短了制备钛酸钠的流程。结果表明:合成的钛酸钠主要是Na2Ti3O7和Na2Ti6O13的混合相,在低电流密度为17.7 mA/g下,其初始放电比容量可达233.77 mA·h/g;在电流密度为88.5 mA/g下循环200次后,放电比容量为26.87 mA·h/g,容量保持率为47.56%,充放电效率为99.54%;所制备的混合钛酸钠的储钠过程以赝电容行为占主导作用。
中图分类号:
张瑞, 王正豪, 陈良, 郭孝东, 罗冬梅. 工业钛液合成钛酸钠负极及其储钠性能[J]. 无机盐工业, 2023, 55(12): 66-73.
ZHANG Rui, WANG Zhenghao, CHEN Liang, GUO Xiaodong, LUO Dongmei. Synthesis of sodium titanate anode from industrial titanium liquid and its sodium storage performance[J]. Inorganic Chemicals Industry, 2023, 55(12): 66-73.
表4
本文所制备的混合钛酸钠与其他方法所制备的钛酸钠的电化学性能的对比
制备方法 | 原料 | 产物物相 | 电流密度/循环次数/放电比容量 |
---|---|---|---|
水热法[ | 锐钛TiO2,NaOH | Na2Ti3O7/Na2Ti6O13 | 20 mA/g,100次,约80 mA·h/g;2 000 mA/g, 4 000次,19.45 mA·h/g |
溶胶-凝胶法[ | 丁醇钛,NaOH | Na2Ti3O7;Na2Ti3O7/MWCNT | 0.2C,50次,8 mA·h/g;0.2C,50次,160 mA·h/g |
喷雾干燥法[ 1 000 ℃,8 h) | TiO2,Na2CO3 | 800 ℃:Na2Ti3O7; 1 000 ℃:Na2Ti3O7 | 35.6 mA/g,500次,44 mA·h/g;178 mA/g, 500次,32 mA·h/g |
高温固相法[ | TiO2和Na2CO3·H2O,TiO2和NaOH | 24 h:CO-Na2Ti3O7; 20 h:OH-Na2Ti3O7 | 0.1C,100次,<10 mA·h/g;0.1C,100次,约 76.9 mA·h/g |
高温固相法[ | TiO2(锐钛与金红石混合)和Na2CO3 | m-Na2Ti3O7;t-Na2Ti3O7 | 20 mA/g,20次,35.5 mA·h/g;20 mA/g,20次, 约92 mA·h/g |
高温固相法(800 ℃,20 h) | 工业钛液水解得到的偏钛酸,Na2CO3 | Na2Ti3O7/Na2Ti6O13 | 88.5 mA/g,200次,26.87 mA·h/g |
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