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Combining cold sintering and Bi2O3-Activated liquid-phase sintering to fabricate high-conductivity Mg-doped NASICON at reduced temperatures

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Journal Article - Open Access

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University of California San Diego United States

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The cold sintering process CSP and Bi2O3-activated liquid-phase sintering LPS are combined to densify Mg-doped NASICON Na3.256Mg0.128Zr1.872Si2PO12 to achieve high densities and conductivities at reduced temperatures. As an example, a cold-sintered specimen with the addition of 1.1wt Bi2O3 sintering additive achieved a high conductivity of 0.91 mScm with 96 relative density afterannealing at 1000 deg C this conductivity is 70 higher than that of a cold-sintered specimen without adding the Bi2O3 sintering additive, and it is 700 of the conductivity of a dry-pressed counterpart with the same amount of Bi2O3 added, all of which are subjected to the same heating profile. The highest conductivity achieved in this study via combining CSP and Bi2O3-activated LSP is 1.5 mScm. This study suggests an opportunity to combine the new CSP with the traditional LPS to sinter solid electrolytes to achieve high densities and conductivities at reduced temperatures. This combined CSP-LPS approach can be extended to a broad range of other materials to fabricate the thermally fragile solid electrolytes or solid-state battery systems, where reducing the processing temperature is often desirable.

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  • Fabrication Metallurgy

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