Effect of the binder content on the electrochemical performance of composite cathode using Li6PS5Cl precursor solution in an all-solid-state lithium battery

Abstract

All solid state batteries with cathode composites containing high concentration of active materials are required to achieve higher energy densities. Here, a composite cathode containing up to 89 wt% of high voltage cathode active material (LiNi Mn Co O ) was prepared by covering this with a solution derived solid electrolyte (argyrodite, Li PS Cl) and the incorporation of different content binder (ethyl cellulose). All solid state batteries were fabricated using 80Li S•20P S (mol%) glass and indium metal as a solid electrolyte and anode, respectively. The all solid state battery with a composite cathode containing 0.5 wt% of ethyl cellulose showed an initial discharge capacity of 45 mAhg at 25 °C and maintained 91.7% of the discharge capacity after ten cycles, around 30% higher than that obtained for the battery with the composite cathode without a binder.

Instantaneous preparation of high lithium-ion conducting sulfide solid electrolyte Li7P3S11 by a liquid phase process

“…5 A good ionic conduction path at the solid-solid interface between electrode active material and solid electrolyte is a key factor for improving the cycle performance of the all-solid-state battery. [6][7][8][9] Thus, the morphology of the sulde solid electrolyte is also important. Small sized particles with a large interfacial area entail a dense and homogenous electrolyte and electrode composite, which increases the energy density of the all-solid-state battery.…”

“…Small sized particles with a large interfacial area entail a dense and homogenous electrolyte and electrode composite, which increases the energy density of the all-solid-state battery. [8][9][10] Sulde-based solid electrolytes generally are synthesized by the ball milling method, 11 which requires high synthesis energy and a longtime, more than 24 h. Recently, liquid phase synthesis using an organic solvent has been reported. Smaller particle size, in the nanometer range, has been obtained by this process.…”

Slurry-Based Processing of Solid Electrolytes: A Comparative Binder Study

“…Previous studies have shown that the resistivity of SE layers increases with binder content, owing to the insulating behavior of the polymers. 9,14 Consequently, the amount of binder should be reduced as far as possible. With SBR, 10 wt% (equaling to about 20 vol.%) were necessary to fabricate a homogeneous, freestanding SE sheet with low porosity, whereas 7.5 wt% PEVA delivered comparable results.…”

“…They reported the combination of acrylonitrile butadiene rubber (NBR) with p-xylene, yielding SE sheets with an AC impedance derived ionic conductivity effectively equal to pressed LPS samples. It was concluded that although incorporation of a nonconductive binder is expected to reduce the ionic conductivity of the SE layer according to various reports, 4,7,9,14,19 the good distribution and ion-dipole interaction of NBR results in a compensation of the intrinsically lower conductivity. The benefits of forming a freestanding SE layer instead of directly coating the SE on one of the electrodes became clear in a study by Ito et al 21 They found, for instance, that using the same binder in the electrode and the SE layer leads to mutual dissolution at the interface.…”

Electrical Conductivity Studies of Composites Based on (Cu1–xAgx)7GeSe5I Solid Solutions

“…The wide potential for the substitution of atoms makes them promising for obtaining the solid solutions based on them, which are, in turn, a prospect for the purposeful search of materials with predetermined parameters. The representatives of the argyrodite family are well known as superionic conductors and widely used for the applications as the solid-state batteries, su- percapacitors, and other electrochemical devices [2][3][4][5][6]. The growth processes and physical and chemical properties of Cu 7 GeS 5 I and Cu 7 GeSe 5 I crystals, as well as Cu 7 Ge(S 1− Se ) 5 I mixed crystals on their base, were studied in several papers [7][8][9].…”