Effect of Organic Electrolyte on the Performance of Solid Electrolyte for Solid–Liquid Hybrid Lithium Batteries

Abstract

The interface problem caused by the contact between the electrodes and the solid electrolyte was the main factor hindering the development of solid-state batteries. To enhance the electrode|solid electrolyte interface property, we designed a hybrid electrolyte, the combination of x vol % Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) inorganic solid electrolyte and 1 − x vol % liquid organic electrolyte (LE). In this work, the 1 − x vol % LE was dropped between the electrode and the solid electrolyte, and it is found that the electrochemical performance of the LiFePO 4 |Li solid−liquid hybrid battery is significantly improved. At the current density of 0.1 and 0.5 C, the LATP with 15% liquid organic electrolyte could deliver a specific capacity of 160.5 and 124.3 mAh g −1 , respectively; moreover, the specific discharge capacity remained as high as 111 mAh g −1 at 0.5 C after 100 cycles, indicating that the larger interface impedance was eliminated. The LE may have three functions: (1) forming a solid−liquid electrolyte interphase on the surface of the LATP particles to prevent further reduction of LATP, (2) wetting the electrode and solid electrolyte to reduce the interface resistance, and (3) improving interfacial Li-ion transport.

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

“…LATP was prepared by the previously reported method . The LATP powder was first compressed into pellets.…”

Research progress in stable interfacial constructions between composite polymer electrolytes and electrodes

“…Building an interfacial layer on the surface of the lithium metal anode is a very effective way to improve the stability of the CPE-Li interface. [152][153][154][155][156][157][158] On the one hand, the coating layer induces uniform lithium deposition and slows down the growth rate of dendrites, including organics, inorganics, composites, etc. On the other hand, an artificial SEI layer can be created with desired properties by using additives, through in situ polymerization or crosslinking reactions.…”

The role of polymers in lithium solid-state batteries with inorganic solid electrolytes

“…193 Additionally, Tang et al reported the use of 15 vol% of a liquid carbonate based electrolyte to protect the chemically instable LATP ISE and the interfacial resistance was decreased from 1400 U (pristine LATP) to 90 U. 204 The incorporation of llers can improve the chemical stability and mechanical strength of the SPEs. 201,205 Additionally, a ceramic ller (e.g.…”