纳米磷酸钒钠的制备及其储钠性能研究
Research on preparation of nano sodium vanadium phosphate and its sodium storage properties
张东彬 1袁欣然 1辛亚男 2毕新强 3刘天豪 1韩慧果 2杜光超 4滕艾均1
作者信息
- 1. 鞍钢集团北京研究院有限公司,北京 102211
- 2. 成都先进金属材料产业技术研究院股份有限公司,四川成都 610300
- 3. 四川攀研技术有限公司,四川攀枝花 617000
- 4. 攀钢集团研究院有限公司,钒钛资源综合利用国家重点实验室,四川攀枝花 617000
- 折叠
摘要
基于磷酸钒钠制备条件苛刻、颗粒粒径大、电导率差等问题,提出了一种制备纳米磷酸钒钠的新方法.通过碱性沉钒形成羟基氧化钒,再利用PO43-、F-等阴离子与OH-的原位离子交换,从而得到纳米化的磷酸钒钠.借助XRD、SEM、FTIR等方法,分析了纳米磷酸钒钠的形成机理,优化了合成条件.电化学测试结果表明,磷酸钒钠的纳米化提升了电子/离子输运能力,使得所制备的纳米磷酸钒钠表现出优异的储钠性能.当电流密度为10mA/g时,其放电比容量为106.68 mAh/g,并且循环20次循环充放电后,仍能保持80.85 mAh/g的放电比容量.
Abstract
Based on the severe preparation conditions,large particle size and poor conductivity,a new method to prepare sodium vanadium phosphate was proposed.By the formation of alkaline vanadium compounds,vanadium hydroxyloxide,and the in-situ anions exchange reactions between PO43-,F and OH-,nano vanadium sodium phosphate was consequently obtained.With the help of XRD,SEM,FTIR,the formation mechanism of nano vanadium sodium phosphate was analyzed,and the synthesis condi-tions were optimized.The electrochemical test results show that the sodium vanadium phosphate in nanoscale improves the electron/ion transport capacity,and makes the prepared sodium vanadium phos-phate show excellent sodium storage performances.When the current density is 10 mA/g,the specific discharge capacity is 106.68 mAh/g.At the same time,the specific discharge capacity of 80.85 mAh/g can be maintained after 20 charge and discharge cycles.
关键词
纳米材料/磷酸钒钠/离子交换/正极材料/储钠性能Key words
nano materials/sodium vanadium phosphate/ion exchange/positive electrode materials/sodium storage properties引用本文复制引用
基金项目
国家重点研发计划(2023YFC2908305)
国家重点研发计划(2022YFC3901004)
出版年
2024
国家科技期刊平台
NSTL
万方数据