Reduction of Grain Boundary Resistance of La0.5Li0.5TiO3 by the Addition of Organic Polymers

Abstract

The organic solvents that are widely used as electrolytes in lithium ion batteries present safety challenges due to their volatile and flammable nature. The replacement of liquid organic electrolytes by non-volatile and intrinsically safe ceramic solid electrolytes is an effective approach to address the safety issue. However, the high total resistance (bulk and grain boundary) of such compounds, especially at low temperatures, makes those solid electrolyte systems unpractical for many applications where high power and low temperature performance are required. The addition of small quantities of a polymer is an efficient and low cost approach to reduce the grain boundary resistance of inorganic solid electrolytes. Therefore, in this work, we study the ionic conductivity of different composites based on non-sintered lithium lanthanum titanium oxide (La0.5Li0.5TiO3) as inorganic ceramic material and organic polymers with different characteristics, added in low percentage (<15 wt.%). The proposed cheap composite solid electrolytes double the ionic conductivity of the less cost-effective sintered La0.5Li0.5TiO3.

The Role of Sintering Temperature and Dual Metal Substitutions (Al3+, Ti4+) in the Development of NASICON-Structured Electrolyte

“…Electrolyte sintered at 750•C shows an increase in grain size, while the grain size is further increased for 950 • C and clear grain boundaries can be seen. The increment in grain size is usually due either to re-crystallization or the existing defects in the crystal[32,33]. These results are in good agreement with XRD analysis, in which most samples experience increments in crystallinity at higher sintering temperature, as shown in Figure1.…”

Investigating surface and wettability properties of Na2Ti3O7/Na2Ti6O13/PVA composites

“…Inorganic solid electrolytes generally exhibit high ionic conductivity, thermal stability, and electrochemical stability. However, they require high-temperature processing using ceramic materials, have resistive behavior at the electrode-electrolyte interface, and lower ionic conductivities compared to liquid electrolytes [1]. On the other hand, organic electrolytes are lightweight, offer good interface contact, and have simple processing methods [2].…”