粉末尺寸对等离子喷涂Li1.3Al0.3Ti1.7(PO4)3电解质成分与结构的影响OA北大核心CSTPCD

Lithium-ion batteries are regarded as one of the most promising energy storage devices.However,traditional lithium-ion batteries face safety risks due to flammable organic liquid electrolytes and are limited by their energy density.All-solid-state lithium-ion batteries(ASSLiBs)are emerging as a safer and more energy-dense alternative,offering improved electrochemical cycle performance and long-term stability.A critical challenge for ASSLiBs is the cost-effective fabrication of solid electrolytes.NASICON-type Li1.3Al0.3Ti1.7(PO4)3(LATP)material has attracted wide attention due to its high ionic conductivity and stability under humidity conditions.Atmospheric plasma spraying(APS)is a low-cost and high-efficiency coating technology that involves heating and accelerating powder materials with a plasma jet to form continuous deposits on a substrate.This study investigates the preparation of LATP splats and deposits via APS,focusing on how spray parameters and particle size affect P content and the microstructure of the deposits.Results show that plasma arc power has a significant effect on the melting degree of LATP particles,with the fraction of completely melted particles increasing with the increase of the arc power.When the arc power increases from 34 kW to 42 kW,the fraction of fully-molten splats grows from 32.9% to 53.5%,and the maximum particle size increases from 34.3 μm to 48.5 μm.Additionally,P preferentially evaporates during plasma spraying,with a particle size effect on P loss when particle size is smaller than 25 μm.Smaller particles leads to greater P evaporation,with the lowest loss of 5% observed at 34 kW arc power,increasing to 10% at 42 kW.The particle size distribution also has a significant effect on the microstructure of plasma-sprayed LATP deposits.Dense electrolytes are achieved using the powder A with a particle size range of 30-50 μm at an arc power of 42 kW.The phase structure of LATP deposits remains consistent with that of the starting powder,indicating that plasma spraying does not alter its phase structure.These results underscore the potential of APS for large-scale preparation of LATP electrolytes.