One-Step Sintering Preparation of Lithium Lanthanum Titanium Oxide Straight-Hole Ceramics and Solid-State Battery Performance
Lithium lanthanum titanium oxide(LLTO)ceramic electrolyte possesses high ion conductivity and thermal stability,rendering it an ideal candidate for solid-state batteries.However,conventional methods of electrolyte preparation suffer from drawbacks such as poor interface contact,cumbersome procedures,and significant lithium loss during high-temperature sintering.To address these issues,a one-step sintering method to synthesize LLTO ceramic electrolytes with a straight-hole structure was developed.The micromorphology and electrochemical properties of one-step sintering prepared LLTO ceramic electrolytes were thoroughly investigated.The results reveal that this method enables the synthesis and sintering of LLTO ceramics with straight-hole structure in one step,thereby efficiently circumventing lithium loss during multiple sintering processes,enhancing the densification of LLTO ceramics,and reducing grain boundary resistance.Notably,LLTO ceramic electrolytes synthesized via one-step sintering method exhibit a high conductivity of 2.31 × 10-4 S/cm at room temperature.Moreover,Li/Li symmetric batteries assembled using this electrolytes demonstrate excellent Li+deposition and stripping performance,which can be stable cycling for over 350 h at a current density of 0.1 mA/cm2.Furthermore,the all-solid-state lithium battery assembled with this electrolytes maintains a capacity retention rate of 94％after 200 cycles at a rate of 0.2 C,demonstrating the exceptional stability of straight-hole LLTO ceramics prepared via one-step sintering.
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