Korea Institute of Industrial Technology

Da Hye Kim

Ho Sung Kim

Seung Hoon Yang

Ha Young Jung

Min Young Kim

Min-Young Kim

Hye Min Ryu

A method of preparing a sintered solid electrolyte includes (a) coprecipitating a mixed solution including a lanthanum precursor, a zirconium precursor, a gallium precursor, a complexing agent, and a pH adjuster to provide a solid electrolyte precursor; (b) washing and drying the solid electrolyte precursor to provide a washed and dried solid electrolyte precursor; (c) mixing the washed and dried solid electrolyte precursor with a lithium source to provide a mixture; (d) calcining the mixture to provide a calcined solid electrolyte, which is a gallium (Ga)-doped lithium lanthanum zirconium oxide (LLZO), as represented by Chemical Formula 1 below,LiLaZrGaO,&#x2003;&#x2003;Chemical Formula 1

Method for preparing a sintered solid electrolyte having high ionic conductivity for an all-solid-state battery

A method of preparing a gallium-doped LLZO solid electrolyte includes (a) preparing a solid electrolyte precursor slurry by subjecting a mixed solution comprising a metal aqueous solution including lanthanum (La), zirconium (Zr) and gallium (Ga), a complexing agent and a pH controller to coprecipitation; (b) preparing a solid electrolyte precursor by washing and drying the solid electrolyte precursor slurry; (c) preparing a mixture by mixing the solid electrolyte precursor with a lithium source; (d) preparing a gallium-doped LLZO solid electrolyte represented by Chemical Formula 1 below by calcining the mixture at 600 to 1,000&#xb0; C.; and (e) thereafter sintering the solid electrolyte represented by Chemical Formula 1 at 1,000 to 1,300&#xb0; C. By adjusting amounts of starting materials and controlling flow rates of supplied materials, a high-precision cubic structure with improved sintering properties is obtained and ionic conductivity of the solid electrolyte is increased.LiGaLaZrO, (5&#x2264;&#x2264;9, 0&#x3c;&#x2264;4, 2&#x2264;&#x2264;4, 1&#x2264;&#x2264;3).&#x2003;&#x2003;Chemical Formula 1

Method of preparing a gallium-doped LLZO solid electrolyte for an all-solid-state lithium secondary battery

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Gwangju, South Korea

Da Hye Kim