Li2O烧结助剂对固体氧化物燃料电池LSGM电解质烧结特性及离子电导率的影响

doi:10.15541/jim20220086

无机材料学报 ›› 2022, Vol. 37 ›› Issue (10): 1087-1092.DOI: 10.15541/jim20220086

Li₂O烧结助剂对固体氧化物燃料电池LSGM电解质烧结特性及离子电导率的影响

樊帅¹(), 金天¹, 张山林², 雒晓涛¹, 李成新¹, 李长久¹()

1.西安交通大学材料科学与工程学院金属材料强度国家重点实验室, 西安 710049
2.中山大学化学工程与技术学院, 珠海 519082

收稿日期:2022-02-23 修回日期:2022-04-08 出版日期:2022-10-20 网络出版日期:2022-04-26
通讯作者: 李长久, 教授. E-mail: licj@mail.xjtu.edu.cn
作者简介:樊帅(1996-), 男, 硕士研究生. E-mail: f674352798@163.com
基金资助:
国家重点研发计划(2017YFE0105900)

Effect of Li₂O Sintering Aid on Sintering Characteristics and Electrical Conductivity of LSGM Electrolyte for Solid Oxide Fuel Cell

FAN Shuai¹(), JIN Tian¹, ZHANG Shanlin², LUO Xiaotao¹, LI Chengxin¹, LI Changjiu¹()

1. State Key Laboratory of Mechanical Behavior for Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2. School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, China

Received:2022-02-23 Revised:2022-04-08 Published:2022-10-20 Online:2022-04-26
Contact: LI Changjiu, professor. E-mail: licj@mail.xjtu.edu.cn
About author:FAN Shuai (1996-), male, Master candidate. E-mail: f674352798@163.com
Supported by:
National Key R&D Program of China(2017YFE0105900)

摘要/Abstract

摘要：

本工作研究了Li₂O作为烧结助剂对固体氧化物燃料电池La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-_δ (LSGM)电解质烧结行为的影响规律, 系统表征了烧结助剂含量和烧结温度对LSGM烧结体的致密度、微观组织结构、相组成以及离子电导率的影响。研究结果表明, Li₂O烧结助剂不仅可显著降低LSGM电解质的完全致密化烧结温度, 还可以消除电解质粉体中原有的LaSrGa₃O₇杂相, 并且抑制常规烧结过程中易于产生的MgO杂相, 从而获得较高离子电导率的LSGM块体。当Li元素添加量为摩尔分数1%时, 在1400 ℃烧结4 h 获得的LSGM烧结体, 其体密度达到理论密度的99% 且为单一的钙钛矿结构。烧结体的离子电导率在800 ℃测试温度下达到最大值0.17 S/cm, 相比未添加烧结助剂的试样提升20%以上。上述结果表明, 通过添加适量的Li₂O作为烧结助剂对制备用于中温固体氧化物燃料电池(IT-SOFCs)高离子电导率的电解质具有重要意义。

关键词: 固体氧化物燃料电池, LSGM电解质, 烧结助剂, 烧结特性, 离子电导率

Abstract:

This work investigated the influence of Li₂O as a sintering aid on the sintering behavior of La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-_δ (LSGM) electrolytes in solid oxide fuel cells, which systematically presented the effects of sintering aid content and sintering temperature on the density, microstructure, phase composition, and the ionic conductivity of sintered LSGM bulk. The results show that addition of Li₂O sintering aid not only reduces the sintering temperature, but also eliminates the LaSrGa₃O₇ impurity phase in the sintered LSGM and suppresses the formation of MgO impurity phase which is easily generated during the conventional sintering process. Moreover, the addition of Li₂O increases the ionic conductivity of sintered LSGM electrolytes. When 1% (molar percentage) Li₂O is added, the LSGM bulk sintered at 1400 ℃ for 4 h reaches 99% of the theoretical density and presents a single perovskite stracture. When tested at 800 ℃, the ionic conductivity of the sintered bulk reaches 0.17 S/cm, which is 20% higher than that of the sample without sintering aid. All results demonstrate that adding an appropriate amount of Li₂O as sintering aid is of great significance for the application of high ionic conductivity electrolyte in intermediate- temperature solid oxide fuel cells (IT-SOFCs).

Key words: solid oxide fuel cell, LSGM electrolyte, sintering aid, sintering characteristics, ionic conductivity

中图分类号:

TM911

樊帅, 金天, 张山林, 雒晓涛, 李成新, 李长久. Li₂O烧结助剂对固体氧化物燃料电池LSGM电解质烧结特性及离子电导率的影响[J]. 无机材料学报, 2022, 37(10): 1087-1092.

FAN Shuai, JIN Tian, ZHANG Shanlin, LUO Xiaotao, LI Chengxin, LI Changjiu. Effect of Li₂O Sintering Aid on Sintering Characteristics and Electrical Conductivity of LSGM Electrolyte for Solid Oxide Fuel Cell[J]. Journal of Inorganic Materials, 2022, 37(10): 1087-1092.

图/表 6

图1 LSGM-xLi-T的相对致密度随烧结温度的变化曲线

Fig. 1 Relative density of LSGM-xLi-T as a function of sintering temperature

图2 LSGM-xLi-1400试样的ICP测试结果

Fig. 2 ICP test results of LSGM-xLi-1400

图3 LSGM-xLi-1400试样的抛光断面SEM照片

Fig. 3 Cross sectional SEM images of LSGM-xLi-1400 samples (a, b) x=0; (c) x=0.5; (d) x=1; (e) x=1.5; (f) x=2

表1 图3(b)选中区域的元素组成

Table 1 Element contents of the selected areas in Fig. 3(b)

Area	Mole fraction/%
Area	La	Sr	Ga	Mg	O
A	7.83	7.26	23.65	0.00	61.26
B	0.75	0.57	0.55	47.31	50.82
C	17.85	4.73	16.40	4.32	56.70

图4 LSGM-xLi-1400试样和原始粉末的XRD图谱

Fig. 4 XRD patterns of LSGM-xLi-1400 and original powder

图5 LSGM-xLi-1400试样在不同测试温度下的离子电导率

Fig. 5 Change of ionic conductivity of LSGM-xLi-1400 tested under different temperatures

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Li₂O烧结助剂对固体氧化物燃料电池LSGM电解质烧结特性及离子电导率的影响

Effect of Li₂O Sintering Aid on Sintering Characteristics and Electrical Conductivity of LSGM Electrolyte for Solid Oxide Fuel Cell

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