烧结助剂Al2O3与Y2O3对固态锂离子电解质LLZO的锂离子电导率的影响

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Abstract The garnet-type ceramic electrolyte Li₇La₃Zr₂O₁₂ (LLZO) with composition of xAl₂O₃-Li₇La₃Zr₂O₁₂ (x=0-0.4) and xY₂O₃-Li₇La₃Zr₂O₁₂ (x=0, 0.1, 0.2, 0.3 and0.4) were synthesized by adding Al₂O₃ and Y₂O₃ as sintering aids and using Li₂CO₃, La₂O₃and ZrO₂ as raw materials. The effects of the contents of sintering aids Al₂O₃and Y₂O₃ on the lithium ion conductivity of solid lithium ion electrolyte LLZO were studied. The results reveal that two kinds of sintering aids both can stabilize the cubic phase of garnet structure LLZO after sintered at 1 500 ℃ for 15 h. The LaAlO₃ impurity phase is produced when Al₂O₃ is over added. The Li₂ZrO₃ and YO_1.458 impurity phases are produced when Y₂O₃ is over added. Among these samples,0.2Y₂O₃-LLZO can stabilize the cubic phase from 1 100 ℃ to 1 200 ℃ and do not decompose when sintering at 1 150 ℃ for 27 h。The density of LLZO and the conductivity of lithium ion increase first and then decrease with increasing the content of sintering aids. The optimum additions of Al₂O₃ and Y₂O₃ are 0.2 and 0.3, respectively. The density and ionic conductivity of 0.2Al₂O₃-LLZO are 94% and 1.78×10^-4 S/cm, respectively. The density and ionic conductivity of 0.3Y₂O₃-Li₇La₃Zr₂O₁₂ are 96% and 5.23×10^-4 S/cm, respectively.

Key words： solid state lithium electrolyte garnet structure Li₇La₃Zr₂O₁₂ Al₂O₃ Y₂O₃

Received: 24 April 2017 Published: 12 July 2019

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	LI Jian
	JIANG Yixiong
	ZHOU Hongming

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LI Jian,JIANG Yixiong,ZHOU Hongming. Effects of sintering aids Al₂O₃and Y₂O₃ on the lithium ion conductivity of solid lithium ion electrolyte LLZO[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(2): 199-205.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I2/199

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