The liquid electrolyte modified interface between garnet-type solid-state electrolyte and lithium anode

doi:10.19799/j.cnki.2095-4239.2021.0070

Abstract

Abstract:

Garnet-type electrolyte-based solid-state lithium metal batteries have attracted the attention of researchers due to their advantages of high energy density, high safety and long cycle life. However, there is huge interfacial impedance between garnet-type electrolyte and lithium anode, which seriously impedes the normal operation of the cell. To solve this problem, a bit of liquid electrolyte is introduced into the interface between garnet-type electrolyte and lithium anode in this work, which obviously reduces the interfacial resistance, and makes the solid-state lithium symmetric cells cycle normally. Furthermore, the morphology composition, interfacial resistance and cycle stability of the interface layer between garnet-type electrolyte and lithium anode are studied by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The research results show that liquid electrolyte greatly decreases the interface resistance, especially at 80 ℃, the values are as low as 1.89 Ω·cm² and 3.24 Ω·cm² before and after cycling, respectively.

Key words: garnet-type solid-state electrolyte, lithium anode, interface, liquid electrolyte, interface resistance

CLC Number:

TQ 028.8

Shangsen CHI, Yidong JIANG, Qingrong WANG, Ziwei YE, Kai YU, Jun MA, Jun JIN, Jun WANG, Chaoyang WANG, Zhaoyin WEN, Yonghong DENG. The liquid electrolyte modified interface between garnet-type solid-state electrolyte and lithium anode[J]. Energy Storage Science and Technology, 2021, 10(3): 914-924.

Figures/Tables 12

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References 14

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温度/℃	20	40	60	80
LLZTO	9.07 ×10^-5	4.637 ×10^-4	1.18 ×10^-3	7.67 ×10^-3
液体电解液	2.86 ×10^-3	8.51 ×10^-3	1.207 ×10^-2	1.396 ×10^-2

温度/℃	R_b/Ω·cm²	R₁/Ω·cm²	CPE1/F·cm²	R₂/Ω·cm²	CPE2/F·cm²
30	83.95	51.98	0.9975	256.8	0.7789
60	21.30	5.49	1.372	14.86	0.9705
80	13.03	1.139	1.404	2.656	1.014

温度/℃	R_b/Ω·cm²	R₁/Ω·cm²	CPE1/F·cm²	R₂/Ω·cm²	CPE2/F·cm²
30	95.33	77.20	0.99864	262.40	0.77642
60	23.96	3.848	1.295	23.13	0.81194
80	14.48	1.829	1.328	4.666	0.92066

静置时间/h	温度/°C	R_b/Ω·cm²	R₁/Ω·cm²	CPE1/F·cm²	R₂/Ω·cm²	CPE2/F·cm²
1	30	83.95	51.98	0.9975	256.8	0.7789
1	80	13.03	1.139	1.404	2.656	1.014
24	30	215.96	49.34	0.92438	560.66	0.92438
24	80	15.06	2.524	1.114	7.623	0.80257
72	30	235.07	50.16	0.92267	565.46	0.79041
72	80	15.78	2.649	1.116	9.031	0.76511

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