A highly conductive and stable hybrid solid electrolyte for high voltage lithium metal batteries. Issue 24 (6th June 2022)

• Record Type: Journal Article
• Authors: Yu, Jiangtao; Hu, Yin; Ma, Xinyu; Zou, Xiuyang; Qi, Haojun; Zhou, Yingjie; Yan, Feng
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 24(2022)
• Page Start: 12842
• Page End: 12855
• Publication Date: 2022-06-06
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta02315f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A hybrid solid electrolyte (HSE) is prepared by using ionomer P(VDF-HFP)-Li x, as matrix and LATP as ceramic filler. The obtained HSE exhibits high ionic conductivity (7.88 × 10 −4 S cm −1 at 25 °C) and electrochemical stability (5.16 V vs. Li/Li + ). Abstract : Understanding Li + migration behavior in hybrid solid-state electrolytes (HSEs) is essential for realizing the conductivity of HSE and high energy density Li metal batteries. Here, a highly conductive HSE with a continuous lithium-ion (Li + ) transport pathway consisting of an anionic-type single Li + conductor polymer (lithium taurine-grafted poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)-Li x, x represents the amount of lithium taurine)) and Li1.4 Al0.4 Ti1.6 (PO4 )3 (LATP) particles are prepared for solid-state lithium metal batteries. The prepared ionomer P(VDF-HFP)-Li x can enhance the transmission efficiency of Li + in the polymer substrate, forming a "Li + transport bridge" between inorganic particles to provide rapid and continuous Li + transmission channels in HSE, and eliminating interface charge accumulation caused by an excessive impedance difference of the polymer/ceramic. The P(VDF-HFP)-Li10 -50LATP HSE possesses high ionic conductivity (7.88 × 10 −4 S cm −1 at 25 °C), Li + transference number ( t Li + = 0.61) and electrochemical stability (>5.16 V vs. Li + /Li). Furthermore, the Li‖HSE‖Li symmetrical battery achieves a stability over more than 1000 h at 0.1 mA cm −2, while the HSE-based LiNi0.6 Mn0.2 Co0.2 O2 (NCM622)‖Li and LiNi0.5 Mn1.5 O4 (LNMO)‖Li batteries show high specific capacity (160 mA h g −1 and 126.8 mA h g −1 at 0.5C) and good cycling stability (capacity retention of 93% and 80% after 200 cycles, respectively). This work provides a an effective to achieve high ionic conductivity and stability for HSEs, simultaneously.