Double-Protected Layers with Solid–Liquid Hybrid Electrolytes for Long-Cycle-Life Lithium Batteries

Abstract

Lithium-ion batteries (LIBs) with liquid electrolytes (LEs) have problems such as electrolyte leakage, low safety profiles, and low energy density, which limit their further development. However, LIBs with solid electrolytes are safer with better energy and hightemperature performance. Thus, solid electrolyte system batteries have attracted widespread attention. However, due to the inherent rigidity of the LATP solid electrolyte, there is a high interface impedance at the LATP/electrode. In addition, the Ti element in LATP easily reacts with the Li metal. Here, we dripped an LE at the LATP/electrode interface (solid−liquid hybrid electrolytes) to reduce its interface impedance. A composite polymer electrolyte (CPE) protective film (containing PVDF, SN, and LiTFSI) was then cured in situ at the LATP/Li interface to avoid side reactions of LATP. The discharge specific capacity of the LiFePO 4 /LATP-12% LE-CPE/Li system is up to 150 mAh g −1 , and the capacity retention rate is still 96% after 250 cycles. In addition, the NCM622/PVDF-LATP-12% LE/Li system has an initial reversible capacity of 170 mAh g −1 . This study reports an approach that can protect solid electrolytes from lithium metal instability.

Optimizing Li1.3Al0.3Ti1.7(PO4)3 Particle Sizes toward High Ionic Conductivity

“…As shown in Figure b and c, this hybrid cell delivered a high specific capacity of 157 mAh g –1 at the first cycle and maintained 140 mAh g –1 at the 60th cycle with a Coulombic efficiency of ∼100%. The total resistance of this hybrid Li–LFP battery was equivalent to that of other reports in the literature. , These results proved that the LATP ceramics prepared in this work could be applied in solid-state batteries.…”

“…The total resistance of this hybrid Li−LFP battery was equivalent to that of other reports in the literature. 17,73 These results proved that the LATP ceramics prepared in this work could be applied in solidstate batteries.…”

A Review of Polymer‐based Solid‐State Electrolytes for Lithium‐Metal Batteries: Structure, Kinetic, Interface Stability, and Application

“…[102] Therefore, more work focused on improving the ionic conductivity of polymer-based SSEs by incorporating active fillers. Generally, active fillers are researched including the garnet structure oxide of Li 7 La 3 Zr 2 O 12 (LLZO) and Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO), [103] the perovskite structure oxide of Li 3x La 2/3-x TiO 3 (LLTO), [104] and the fast ionic conductor of sodium superionic conductor(NASION). [105]…”

Hybrid Electrolyte of Li1.3Al0.3Ti1.7(PO4)3 Nanofibers and Cross-linked Gel Electrolyte for Li Metal Batteries

“…This is supported by the comparison of the Li∥NCM811 cells with the F-HSE and LATP-PAN 3D mat (Figure S4). Due to the chemical reaction of LATP-PAN in direct contact with the Li metal electrode, , the LATP-PAN cell exhibited a fast capacity fade in the early cycles (82.8% capacity retention at 30 cycles). By contrast, the Li∥NMC811 cell with F-HSE showed stable cycling, which supports the beneficial function of the soft skin layer of F-HSE.…”