摘要
以四氯化钛为原料,在冰水浴,弱碱性条件下,将TiCl_(4)配制为0.5 mol/L水溶液,低温水解得到沉淀产物,将此沉淀在80℃的真空烘箱中干燥;低温400℃下焙烧12 h得到白色粉末。通过X射线衍射(XRD)进行结构表征;通过扫描电子显微镜(SEM)透射电镜(TEM)进行形貌表征。得到的烧结产物,结合金属锂对电极材料和聚乙稀隔膜搭建半电池系统,进行电池性能测试。结果表明,以四氯化钛为原料在低温的条件下实现缓慢水解,再经过长时间低温焙烧得到白色粉末为纳米级金红石型和锐钛矿型TiO_(2)的混合相,且具有粒径小、分散性好、粒径分布窄、球形度较好等优点;此产品在0.05充放电时首次放电比容量为370 mAh/g, 5 C的放电比容量达到69 mAh/g,容量保持率分别为91.69%,电化学性能远高于商业化TiO_(2)。研究表明,基于缓慢水解低温烧结机制制备TiO_(2)的方法是一种简单、低成本、适用于大规模生产的工艺。
Using titanium tetrachloride as the raw material,TiCl_(4) was prepared into a 0.5mol/L aqueous solution in an ice water bath under weakly alkaline conditions.The precipitate was obtained by low-temperature hydrolysis,and the precipitate was dried in a vacuum oven at 80℃and roasted at low temperature of 400℃for 12 hours to obtain white powder.Structural characterization was carried out through X-ray diffraction(XRD).The morphology was characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The obtained sintered products were combined with metal lithium electrode materials and polyethylene separators to construct a semi battery system for battery performance testing.The results showed that titanium tetrachloride was used as the raw material to achieve slow hydrolysis under low temperature conditions,and then subjected to long-term low-temperature calcination to obtain a white powder of nanoscale rutile type TiO_(2),which has advantages such as small particle size,good dispersibility,narrow particle size distribution,and good sphericity.This product has a first discharge specific capacity of 169 mAh/g at 0.2 charge and discharge,and a discharge specific capacity of 69 mAh/g at 5 C,with a capacity retention rate of 91.69%,respectively.Its electrochemical performance is much higher than that of commercial TO_(2).Research has shown that the method of preparing TiO_(2) based on slow hydrolysis low-temperature sintering mechanism is a simple,low-cost,and suitable process for large-scale production.
作者
闫蓓蕾
王俊
朱学军
马光强
邓林
YAN Beilei;WANG Jun;ZHU Xuejun;MA Guangqiang;DENG Lin(School of Biological and Chemical Engineering,Panzhihua University,Panzhihua 617000,China)
出处
《功能材料》
CAS
CSCD
北大核心
2024年第4期4209-4213,共5页
Journal of Functional Materials
基金
国家自然科学基金项目(4210071466)
四川省科技计划项目(2022JDRC0079)。
关键词
四氯化钛
缓慢水解
二氧化钛
锂离子电池
titanium tetrachloride
slow hydrolysis
titanium dioxide
lithium ion battery
