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

doi:10.15541/jim20220086

Abstract

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

CLC Number:

TM911

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.

Figures/Tables 6

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

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

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

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

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

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

References 18

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

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