Effect of Water-soluble Binders on the Synthesis of Silver-modified Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ Solid Electrolytes

국문 초록 (Abstract)

NASICON계 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ (LATP) 산화물계 고체전해질은 양호한 기계적 물성, 높은 Li<SUP>+</SUP> 이동수, 우수한 전기화학적 및 열적 안정성을 나타낸다. LATP의 이온전도도를 높이기 위해 수용성 바인더를 도입하였다. 은은 개질된 고체 방법을 사용하여 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ 고체 전해질에 성공적으로 치환되었다. Pristine Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ 도 치환 전 후를 비교하기 위해 합성되었다. X-ray 회절 패턴은 바인더의 첨가 후 피크의 이동을 보였으며 이는 전해질에 대한 바인더의 영향으로 나타났다. 은으로 개질된 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃에서 넓고 증가된 피크가 발견되었다. 또한 46.5° 부근에서 작은 새로운 피크가 나타났는데, 이는 LATP에 은이 성공적으로 치환되었음을 나타낸다. 이온전도도 측정은 EIS (Electrochemical Impedance Spectroscopy)로 수행되었으며 고체 전해질 용 바인더로서 1% PVA가 사용된 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃가 4.65 × 10<SUP>-5</SUP> S/cm의 가장 높은 값을 나타낸다.

다국어 초록 (Multilingual Abstract)

NASICON-type Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ (LATP) oxide-based solid electrolyte shows the favorable mechanical property, high Li+ transfer number, and excellent electrochemical and thermal stability. Water-soluble binders were introduced in order to increase the ionic conductivity of LATP. Silver was successfully substituted to the Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ solid electrolyte using a modified solid-state method for all-solid-state lithium batteries (ASSLBs). The pristine Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ was also synthesized for comparison before and after silver modification. X-ray diffraction patterns showed the peak shifting after the addition of binders were shown as the effect of binders on the electrolyte. A similar peak with slightly increased and peak broadening for silver-modified LATP appeared after the addition of silver. There are also a small new peak appeared at around 46.5° theta degree indicating that the modification of silver on LATP has successfully synthesized. The ionic conductivity measurement was conducted by Electrochemical Impedance Spectroscopy (EIS) and revealed LATP with 1% PVA is currently displaying a highest value of 4.65 × 10<SUP>-5</SUP> S/cm as binder for solid electrolytes.

목차 (Table of Contents)

• 초록
• Abstract
• 1. Introduction
• 2. Experimental
• 3. Results and discussion
• 4. Conclusion
• References