工业钛液合成钛酸钠负极及其储钠性能  

Synthesis of sodium titanate anode from industrial titanium liquid and its sodium storage performance

作　　者：张瑞[1] 王正豪 陈良 郭孝东[1] 罗冬梅[1] ZHANG Rui;WANG Zhenghao;CHEN Liang;GUO Xiaodong;LUO Dongmei(School of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《无机盐工业》2023年第12期66-73,共8页Inorganic Chemicals Industry

基　　金：国家自然科学基金资助项目(U20A20145)。

摘　　要：采用传统方法制备钛酸钠材料时,所使用的钛源(如TiO_(2),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Na_(2)Ti_(3)O_(7)和Na_(2)Ti_(6)O_(13)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。When traditional methods are used to prepare sodium titanate materials,the titanium sources used(such as TiO_(2),titanium tetrisopropyl alcohol,etc.)are all pure analytical reagents,which are processed by titanium-bearing minerals through multiple processes.The cost is high and the process of preparing sodium titanate is lengthy.Using industrial titanium liquid as the raw material,the metatitanic acid precursor prepared by atmospheric pressure hydrolysis was used as the titanium source,and the sodium titanate anode was synthesized by the high-temperature solid-phase method,which shortened the preparation process of sodium titanate.The results showed that the synthesized sodium titanate was mainly a mixed phase of Na_(2)Ti_(3)O_(7) and Na_(2)Ti_(6)O_(13),and its initial discharge specific capacity could reach 233.77 mA·h/g at a low current density of 17.7 mA/g.After 200 times at the current density of 88.5 mA/g,the discharge specific capacity of the prepared sodium titanate material was 26.87 mA·h/g,its capacity retention rate was 47.56%,and its charge-discharge efficiency was 99.54%.After further analysis,the sodium storage process of the prepared mixed sodium titanate was dominated by pseudocapacitive behavior.

关 键 词：偏钛酸 钛酸钠 负极材料 钠离子电池 储能 

分 类 号：TQ134.11[化学工程—无机化工]