阳离子交换合成钒酸镁-钒酸钠复合材料纳米线作为锂离子电池电极材料  

Synthesis of magnesium vanadate-sodium vanadate composite nanowires by cation exchange as electrode materials for lithium ion batteries

作　　者：王然然 方东 游昕[1] 易健宏[1] WANG Ranran;FANG Dong;YOU Xin;YI Jianhong(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《复合材料学报》2023年第11期6217-6227,共11页Acta Materiae Compositae Sinica

基　　金：国家科技部重点专项(中国:2021YFE0104300,乌兹别克斯坦:MUK-2021-45);钒钛资源综合利用国家重点实验室开放课题(2021P4FZG09A)。

摘　　要：为了满足对锂离子电池性能更好和更多样化的要求,研究了用于改善电池性能的电极材料,在众多电极材料中,钒基材料的价态变化丰富和种类繁多等优点使其适用于锂离子电池电极材料。以钒酸钠纳米线阵列为前驱体,采用离子交换法合成了钛箔上的钒酸镁(MgV_(2)O_(6))-钒酸钠(NaV_(6)O_(15))复合材料。后续在空气中煅烧,温度分别为300℃和500℃,随着煅烧温度的升高,纳米线的直径变大。对所制备样品的晶体结构、化学成分和微观形貌进行了详细的表征。其中,300℃煅烧制备的钒酸镁-钒酸钠复合材料的电化学储锂性能较好,在电流密度为50 mA·g^(-1)下首次放电容量为1144 mA·h·g^(-1),经过100次循环后的放电比容量仍有837 mA·h·g^(-1),表现出良好的循环稳定性,较钒酸钠前驱体的储锂性能有大幅提升,为镁离子合成碱土金属钒酸盐应用于电化学储能领域的研究提供了新思路。In order to meet the requirements for better and more diversified performance of lithium-ion batteries,electrode materials for improving battery performance were studied.Among many electrode materials,vanadiumbased materials are suitable for lithium-ion battery electrode materials due to their rich valence changes and various types.Magnesium vanadate(MgV_(2)O_(6))-sodium vanadate(NaV_(6)O_(15))composites on titanium foil were synthesized by ion exchange method using sodium vanadate nanowar arrays as precursors.After calcination in air,the temperature was 300℃ and 500℃,respectively.With the increase of the calcination temperature,the diameter of the nanowires became larger.The crystal structure,chemical composition and microstructure of the prepared samples were characterized in detail.Among them,the magnesium vanadate and sodium vanadate composite prepared by calcination at 300℃ had better electrochemical lithium storage performance.The first discharge capacity was 1144 mA·h·g^(-1) at the current density of 50 mA·g^(-1),and the specific discharge capacity was still 837 mA·h·g^(-1) after 100 cycles,showing good cycling stability.Compared with sodium vanadate precursor,the lithium storage performance was significantly improved.It provides a new idea for the application of alkaline earth vanadate synthesized by magnesium ions in the field of electrochemical energy storage.

关 键 词：阳离子交换 水热法 钒酸镁 钒酸钠 锂离子电池 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TB33