Na_(5)YSi_(4)O_(12)基陶瓷固态钠电池电解质的制备及导电行为研究  

Preparation of Na_(5)YSi_(4)O_(12)-based Solid Sodium Battery Electrolyte and Its Conductive Behaviour

作　　者：徐瑶 刘立敏 周晓亮 郭炜琳 李婕 郭心如 XU Yao;LIU Limin;ZHOU Xiaoliang;GUO Weilin;LI Jie;GUO Xinru(Southwest Petroleum University,College of Chemistry and Chemical Engineering,Chengdu 610500,Sichuan,China)

机构地区：[1]西南石油大学化学化工学院,四川成都610500

出　　处：《陶瓷学报》2024年第3期483-491,共9页Journal of Ceramics

基　　金：国家自然科学基金(22075231);国家重点研发计划(2021YFB4001502);四川省重点研发项目(省院省校科技合作)(2021YFSY0022)。

摘　　要：钠离子固态电解质虽然已经被研究了多年,但其室温电导率低,且与有机液态电解液电导率相差一个数量级,这些缺陷成为限制其实际应用的主要障碍。为此,以Na_(5)YSi_(4)O_(12)基陶瓷电解质作为研究对象,以NaNO_(3)、YN_(3)O_(9)·6H_(2)O和C8H20O4Si为原料,采用溶液辅助的固相反应法(SASSR)制备具有六方晶系结构的高性能固态陶瓷电解质Na_(5)YSi_(4)O_(12)材料。研究了Na_(5)YSi_(4)O_(12)(NYS)的烧结温度、保温时间与离子电导率之间的关系。研究发现,样品经1050℃保温6 h后的离子电导率最高为1.52 mS·cm^(−1),活化能为0.215 eV。相比于传统的固相反应法制备的材料,电导率得到了较大的提升。其较高的电导率得益于Na_(5)YSi_(4)O_(12)粉体烧结活性高和独特的3D传输通道,材料中Na^(+)既可沿着通道传输,也可在不同的通道间进行跨越传输,从而赋予了材料较高的电导率。研究表明Na_(5)YSi_(4)O_(12)是一种很有潜质的快钠离子导体。Although sodium-ion solid electrolytes have been studied for many years,their low conductivity at room temperature and an order of magnitude gap with organic liquid electrolytes are the main obstacles limiting their practical application.In this paper,high performance Na_(5)YSi_(4)O_(12)solid electrolytes with hexagonal crystal structure were prepared by using solution-assisted solid-state reaction(SASSR)method,with NaNO_(3),YN_(3)O_(9)·6H_(2)O and C8H20O4Si as raw materials.The relationship between sintering temperature and dwelling time and ionic conductivity of Na_(5)YSi_(4)O_(12)(NYS)were focused.The sample sintered at 1050℃for 6 h had the highest ionic conductivity of 1.52 mS·cm^(−1),with an activation energy of 0.215 eV.Compared with that of the one prepared with the commercial solid-phase reaction method,conductivity of the material in this work has been greatly improved.The increase in conductivity is attributed to the high sintering activity of the Na_(5)YSi_(4)O_(12)powder and the unique 3D transport channel.The charge carriers can be transported along the channel or across different channels,thus leading to a higher conductivity.

关 键 词：钠离子电池 固态电解质 Na_(5)YSi_(4)O_(12) 离子电导率 溶液辅助的固相反应法 

分 类 号：TQ174.75[化学工程—陶瓷工业]