A dopamine modified Li6.4La3Zr1.4Ta0.6O12/PEO solid-state electrolyte: enhanced thermal and electrochemical properties. Issue 27 (26th June 2019)

• Record Type: Journal Article
• Authors: Huang, Zeya; Pang, Wanying; Liang, Peng; Jin, Zhehui; Grundish, Nicholas; Li, Yutao; Wang, Chang-An
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 27(2019)
• Page Start: 16425
• Page End: 16436
• Publication Date: 2019-06-26
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta03395e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A garnet-type solid-state electrolyte Li6.4 La3 Zr1.4 Ta0.6 O12 (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. Abstract : A garnet-type solid-state electrolyte Li6.4 La3 Zr1.4 Ta0.6 O12 (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 °C increased from 6.3 × 10 −5 S cm −1 to 1.1 × 10 −4 S cm −1, and the interfacial resistance between the composite electrolyte and a metallic lithium anode decreased from 308 Ω cm 2 to 65 Ω cm 2 at 50 °C. The composite electrolyte also demonstrated improved thermal stability.