Preparation of Mo， Al-doped Li7La3Zr2O12-based composite solid electrolyte and performance of all-solid-state batterys

doi:10.19799/j.cnki.2095-4239.2023.0197

Abstract

Abstract:

All-solid-state lithium-ion batteries constructed with solid-state electrolytes have extremely high safety and reliability and are currently a research hotspot. Composite solid-state electrolytes not only improve the mechanical properties and low ionic conductivity of polymer electrolytes but can also solve the issue of interfacial contact with inorganic solid-state electrolytes. Herein, Li₇La₃Zr₂2O₁₂ powder doped with Al and_{Mo was prepared using the sol-gel method. Furthermore, PEO compounds with different proportions of the Li_6.65Al_0.05La₃Zr_1.9Mo_0.1O₁₂ powder were prepared using the solution casting method, and their performances in solid-state batteries were investigated. The Li_6.65Al_0.05La₃Zr_1.9Mo_0.1O₁₂ powder and its composite solid-state electrolytes were characterized using various analytical methods, such as X-ray diffraction, scanning electron microscopy, and differential thermal analysis. The performance of the composite solid-state electrolytes in all-solid-state batteries was evaluated using an electrochemical workstation and a battery charging and discharging test system. Compared with pure PEO electrolyte, the 15%-Li_6.65Al_0.05La₃Zr_1.9Mo_0.1O₁₂ composite electrolyte exhibited an electrochemical window of up to 4.79 V and a stable circulation at 0.2 mA/cm² and 0.1 C ratio for about 500 h. Furthermore, it exhibited a capacity retention of 89.9% after 100 cycles.}

Key words: solid-state composite electrolyte, PEO, LLZO, doping, all-solid-state lithium-ion battery

CLC Number:

TQ 152

Yongli YI, Ran YU, Wu LI, Yi JIN, Zheren DAI. Preparation of Mo， Al-doped Li₇La₃Zr₂O₁₂-based composite solid electrolyte and performance of all-solid-state batterys[J]. Energy Storage Science and Technology, 2023, 12(5): 1490-1499.

Figures/Tables 11

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References 27

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LALZMO复合量	电子电导率(10^-6, 25℃)/(S/cm)	厚度L	拟合X2	电化学窗口
0%	4.78	0.15 mm	0.00778	4.10 V
5%	9.43	0.17 mm	0.00980	4.42 V
10%	31.45	0.17 mm	0.00748	4.67 V
15%	51.77	0.18 mm	0.00769	4.79 V
20%	6.84	0.18 mm	0.00889	4.74 V

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Preparation of Mo， Al-doped Li₇La₃Zr₂O₁₂-based composite solid electrolyte and performance of all-solid-state batterys

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