Electrical and mechanical properties of glass and glass-ceramic electrolytes in the system Li₃BO₃–Li₂SO₄

Abstract

Low-melting oxide glasses are promising as electrolytes for all-solid-state lithium rechargeable batteries. Glasses in the pseudobinary system Li 3 BO 3 Li 2 SO 4 were prepared by a mechanochemical technique. Raman spectra revealed that the glasses contained no macroanions which form networks but consisted only of Li + ions and two discrete ortho-oxoanions, BO 3 3¹ and SO 4 2¹. The density and molar volume increased and elastic moduli decreased with an increase in the Li 2 SO 4 content in the glasses. The heat treatment of the Li 3 BO 3 Li 2 SO 4 glasses at around 300°C brought about the crystallization to form ion conducting glassceramics. Electrical conductivities of the glasses and glass-ceramics in this system were maximized with the mixing of Li 3 BO 3 and Li 2 SO 4 . The conductivities were higher in the glass-ceramics of the compositions with small amounts of Li 2 SO 4 , ranging from 3 © 10 ¹6 to 1 © 10 ¹5 S cm ¹1 at room temperature, compared to the corresponding glasses. This conductivity enhancement by the heat treatment is probably due to the precipitation of solid solutions with a high temperature Li 3 BO 3 phase.

Amorphous Ni‐Rich Li(Ni1−x−yMnxCoy)O2–Li2SO4 Positive Electrode Materials for Bulk‐Type All‐Oxide Solid‐State Batteries

“…[11][12][13]38] The ionic conductivity obtained in this study almost matches with these reported values; therefore, the higher ionic conductivity was probably attributed to the amorphous NMC-Li 2 SO 4 matrix. Owing to the decrease in grain boundary area, the electronic conductivity increased even when the insulating Li 2 SO 4 component was added.…”

“…[18] In addition, there are advantages in the use of amorphous materials to achieve higher capacities and better cycle characteristics owing to the open and random structures. [12,13] All-solid-state cells using this amorphous active material operated as secondary batteries at 100 °C. [22][23][24] The obtained amorphous LiCoO 2 -Li 2 SO 4 positive electrode material exhibited the best charge-discharge performance.…”

“…[8] Therefore, high-temperature sintering is required to achieve a good contact. [12,13] A good contact with electrode active materials was successfully achieved simply by pressing at room temperature, which was enabled by the excellent formability of the electrolyte.Crystalline materials such as layered, [14,15] spinel, [16] and olivine [17] structures have been utilized as positive electrode materials in typical lithium-ion and all-solid-state batteries. [9,10] Therefore, formation of an excellent electrode/ electrolyte interface without high-temperature sintering is important for the operation of all-oxide solid-state batteries.…”

Preparation of an Amorphous 80LiCoO₂·20Li₂SO₄ Thin Film Electrode by Pulsed Laser Deposition

“…The thin film was deposited at 200°C on a Si substrate and a 90Li 3 BO 3 ·10-Li 2 SO 4 (mol%) electrolyte pellet. 15,16 The substrate temperature was chosen for improving characteristics of electrode-electrolyte interfaces based on a previous report. 17 To avoid exposure of the deposited film to the atmosphere, a PLD vacuum chamber connected to an Ar-filled grove box was used.…”

High energy density of multivalent glass‐ceramic cathodes for Li‐ion rechargeable cells and as an efficient photocatalyst for organic degradation

“…So far, there are numerous studies based on glass and glass-ceramic-based materials as electrolytes for batteries, with limited studies as electrodes where the present work falls into action. 7,8 2 | METHODS…”