Overcoming the abnormal grain growth in Ga-doped Li7La3Zr2O12 to enhance the electrochemical stability against Li metal

doi:10.1016/j.ceramint.2019.04.236

SIC OpenIR

	Overcoming the abnormal grain growth in Ga-doped Li7La3Zr2O12 to enhance the electrochemical stability against Li metal
	Su, Jianmeng; Huang, Xiao; Song, Zhen; Xiu, Tongping; Badding, Michael E.; Jin, Jun; Wen, Zhaoyin
	2019-08-15
Source Publication	CERAMICS INTERNATIONAL
ISSN	0272-8842
Volume	45 Issue:12 Pages:14991
Subtype	Article
Abstract	Li7La3Zr2O12 (LLZO) solid electrolyte is a promising candidate for next generation batteries. In the LLZO family with various doping elements, Ga-doped LLZO (Ga-LLZO) delivers the highest Li-ion conductivity of higher than 1 x 10(-3) S cm(-1). However, Ga-LLZO ceramics always contain lots of overgrown huge grains after sintering, resulting in short-circuiting as applied with Li anode in batteries. Hence a simple two-step sintering strategy is developed to prepare fine-grained Ga-LLZO ceramics with good electrochemical properties. Pellets with the composition of Li6.4Ga0.2La3Zr2O12 deliver pure garnet phase, uniform fine grains, high relative density of 97.3% and conductivity of 1.24 x 10(-3) S cm(-1) at 27 degrees C after sintering at 1150 degrees C for 1 min and 1000 degrees C for 3 h. In addition, those fine-grained Ga-LLZO exhibit improved stability against molten Li. The Li/Ga-LLZO/Li symmetric cells show a critical current density of 0.7 mA cm(-2), and a stable cycling of over 600 hat 0.4 mA cm(-2) at 27 degrees C. The Li/Ga-LLZO/LiFePO4 full cells deliver reversible capacity of 150 mAh g(-1), showing negligible decay after 50 cycles. These results bring the Ga-LLZO electrolytes one step closer to practical application in solid-state batteries.
Keyword	LLZO Solid electrolyte Ga-doping Synthesis Solid-state batteries
DOI	10.1016/j.ceramint.2019.04.236
Language	英语
WOS Research Area	Materials Science
Publisher	ELSEVIER SCI LTD
Citation statistics	Cited Times:12[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/26905
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Su, Jianmeng,Huang, Xiao,Song, Zhen,et al. Overcoming the abnormal grain growth in Ga-doped Li7La3Zr2O12 to enhance the electrochemical stability against Li metal[J]. CERAMICS INTERNATIONAL,2019,45(12):14991.
APA	Su, Jianmeng.,Huang, Xiao.,Song, Zhen.,Xiu, Tongping.,Badding, Michael E..,...&Wen, Zhaoyin.(2019).Overcoming the abnormal grain growth in Ga-doped Li7La3Zr2O12 to enhance the electrochemical stability against Li metal.CERAMICS INTERNATIONAL,45(12),14991.
MLA	Su, Jianmeng,et al."Overcoming the abnormal grain growth in Ga-doped Li7La3Zr2O12 to enhance the electrochemical stability against Li metal".CERAMICS INTERNATIONAL 45.12(2019):14991.

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