期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 47, 页码 44124-44132出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13884
关键词
hybrid conductive interface; electrospinning; Li0.33La0.56TiO3 nanofibers; self-driven chemical reaction; Li-metal anode
资金
- National Natural Science Foundation of China [51702047]
- National Key RAMP
- D Program of China [SQ2018YFC200227]
- National Youth Talents Project [2018QNRC001]
- Key Laboratory of Textile Science AMP
- Technology (Donghua University), Ministry of Education [2232018G-01]
Li-metal anodes promise to build high-energystorage systems, but they suffer from safety problems from severe dendrite growth. Here, we develop a thin and conformal hybrid ionic and electronic conducting metal-oxide nanofiber interface to stabilize Li-anodes without forming dendrites. The thin ionicconductive Li0.33La0.56TiO3 (LLTO) nanofiber film is first fabricated by electrospinning followed by pyrolysis. After connecting with the electrolytes-wetted Li-metal anodes, due to the self-driven chemical reactions, LLTO is reduced, and a hybrid conducting interface is developed. The interface can act as a reservoir to redistribute the nonuniform Li-ion flux above the anode surface and reduce the driving force of dendrite formation by leveling electric potential distribution, enabling a stable Li plating-stripping with a low overpotential of 80 mV over 800 h at a high current of 5 mA/cm(2). More practically, the Li-LiNi0.8Co0.15Al0.0O2 cells deliver a high capacity of 147 mA h/g at 1 C with a Coulombic efficiency of 99% over 150 cycles, offering prospects to achieve reliable Li-metal batteries.
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