Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 27, Pages 16425-16436Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta03395e
Keywords
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Funding
- National Natural Science Foundation of China [51872159, 51572145]
- Beijing Natural Science Foundation-Haidian Original Innovation Foundation [L172039]
- Tsinghua University Initiative Scientific Research Program for International Collaboration [20183080011]
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A garnet-type solid-state electrolyte Li6.4La3Zr1.4Ta0.6O12 (LLZTO) was modified using dopamine to improve the wettability of LLZTO with PEO, allowing 80 wt% LLZTO to be uniformly dispersed in 20 wt% PEO/LiTFSI polymer electrolyte. Transmission electron microscopy and Fourier transform infrared spectroscopy confirmed a 4-5 nm thick polydopamine (PDA) layer coating on LLZTO nanoparticles. The composite LLZTO@PDA/PEO electrolyte was synthesized using a solvent casting method. The composite electrolyte has good compatibility and adhesion with both positive and negative electrodes of Li-ion batteries owing to the superior wetting capability of dopamine. This property allows for improved interfacial contact at the electrode/solid electrolyte interface which can decrease the overall resistance of the battery. With dopamine modification, the conductivity of the composite electrolyte at 30 degrees C increased from 6.3 x 10(-5) S cm(-1) to 1.1 x 10(-4) S cm(-1), and the interfacial resistance between the composite electrolyte and a metallic lithium anode decreased from 308 omega cm(2) to 65 omega cm(2) at 50 degrees C. The composite electrolyte also demonstrated improved thermal stability.
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