硅掺杂石榴石型Li7La3Zr2O12固体电解质的制备及性能表征
Preparationand Characterization of Silicon-doped Garnet Li7La3Zr2O12 Solid Electrolyte
黄晓东 1王庆伟 1刘萌 1金广辉1
作者信息
- 1. 河南工业大学材料科学与工程学院,河南郑州 450001
- 折叠
摘要
石榴石型固体电解质Li7La3Zr2O12(LLZO)因为具有高的锂离子电导率、宽的化学窗口和良好的锂金属稳定性而被广泛研究.为进一步提高其电化学性能,得到稳定立方相结构,本文采用高温固相法制备出Si掺杂LLZO(Li7La3Zr2-xSiXO12)固体电解质.探究了Si掺杂量x对烧结陶瓷片的物相组成、晶体结构、微观形貌、相对密度、锂离子电导率和电导活化能的影响.结果表明,随着Si掺杂量x的增加,Li7La3Zr2-xSiXO12烧结陶瓷片的气孔减少,相对密度增加,锂离子电导率随着Si掺杂量x的增加呈现出先上升后下降的趋势.当Si掺杂量x=0.24时,Li7La3Zr2-xSixO12烧结陶瓷片的锂离子电导率达到了最大值4.86x10-4 S·cm-1,电导活化能达到了最低值为0.32 eV.
Abstract
Garnet solid electrolyte Li7La3Zr2O12(LLZO)has been widely studied because of its high lithium ion conductivity,wide chemical window and good lithium metal stability.In order to further improve its electrochem-ical performance and obtain a stablecubic phase structure,Si-doped LLZO(Li7La3Zr2-xSixO12)solid electrolytes were prepared by high temperature solid state method.The effects of Si doping amount x on the phase composi-tion,crystal structure,micro-morphology,relative density,lithium ionic conductivity and conductance activa-tion energy of sintered ceramic sheets were investigated.The results show that with the increase of Si doping con-tent x,the porosity of Li7La3Zr2_xSixO12 sintered ceramics decreases,the relative density increases and the lithi-um ion conductivity increases at first and then decreases with the increase of Si doping content x.When the Si doping content is 0.24,the lithium ion conductivity of Li7La3Zr2_xSixO12 sintered ceramic sheet reaches the maxi-mum value of 4.86×10-4 S·cm-1 and the conductance activation energy reaches the lowest value of 0.32 eV.
关键词
固体电解质/Li7La3Zr2O12/锂离子电导率/Si掺杂Key words
solid electrolyte/Li7La3Zr2O12/lithium ion conductivity/Si doping引用本文复制引用
基金项目
河南省高等学校重点科研项目(21A430009)
出版年
2024
NETL
NSTL
万方数据