Journal
JOURNAL OF POWER SOURCES
Volume 484, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.229195
Keywords
Solid-state electrolyte; Nanoscale ZrO2 skeleton; Fast transport; Ultrastable interface; Lithium metal battery; Long-term cycling
Funding
- National Key Research and Development Program of China New Energy Project for Electric Vehicle [2016YFB0100204]
- National Natural Science Foundation of China [51772030]
- Beijing Key Research and Development Plan [Z181100004518001]
- Beijing Outstanding Young Scientists Program [BJJWZYJH01201910007023]
- China Postdoctoral Science Foundation [2019M650509]
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The novel ZrO2-based nanocomposite electrolyte significantly enhances the conductivity and transport of lithium ions in solid-state lithium metal batteries, leading to superior cycling performance and stability of the batteries.
Solid-state lithium metal batteries are promising next-generation battery systems, but their practical applications are hindered by the poor lithium ion transport kinetics in both the bulk solid electrolyte and electrolyte/electrode interface. A novel ZrO2 -based nanocomposite electrolyte by confining ionic liquids within the nanoscale ZrO2 skeleton is reported, which is highly conductive for lithium ions both in the bulk phase and at the contact interface. Benefited from the fast transport of lithium ions, the nanocomposite electrolyte possesses a high ionic conductivity of 1.176 x 10(-3) S cm(-1) at 30 degrees C. The electrolyte also shows excellent compatibility toward lithium metal anode and good resistance to lithium dendrites because of the uniform deposition of lithium ions influenced by the nanoparticles at interface. Furthermore, the solid-state batteries with different electrode materials, LiFePO4, Li(Ni1/3Mn1/3CO1/3)O-2, and Li-4 Ti5O12, exhibit superior electrochemical stability and remarkable long-term cycling performance, verifying the usefulness of the nanocomposite electrolyte. These results indicate that this electrolyte has great promise for application in solid-state lithium metal batteries because of its dramatically enhanced conductive property and ultrastable interface.
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