콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Synergistic Effect of Dual-Ceramics for Improving the Dispersion Stability and Coating Quality of Aqueous Ceramic Coating Slurries for Polyethylene Separators in Li Secondary Batteries
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2022-08
- 저자명 Ssendagire Kennedy, Jeong-Tae Kim, Jungmin Kim, Yong Min Lee, Isheunesu Phiri and Sun-Yul Ryou
- 학술지명 Batteries
- 발행처명 MDPI
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 6
- 논문 다운로드 링크(외부) https://www.mdpi.com/2313-0105/8/8/82
- 연구분야 공학 > 화학공학
논문 초록 (Abstract)
We demonstrate that dispersion stability and excellent coating quality are achieved in polyethylene (PE) separators by premixing heterogeneous ceramics such as silica (SiO 2 ) and alumina (Al 2 O 3 ) in an aqueous solution, without the need for functional additives such as dispersing agents and surfactants. Due to the opposite polarities of the zeta potentials of SiO2 and Al2O3, SiO2 forms a sheath around the Al2O3 surface. Electrostatic repulsion occurs between the Al2O3 particles encapsulated in SiO2 to improve the dispersion stability of the slurry. The CCSs fabricated using a dual ceramic (SiO2 and Al2O3 )-containing aqueous coating slurry, denoted as DC-CCSs, exhibit improved physical properties, such as a wetting property, electrolyte uptake, and ionic conductivity, compared to bare PE separators and CCSs coated with a single ceramic of Al2O3 (SC-CCSs). Consequently, DC-CCSs exhibit an improved electrochemical performance, in terms of rate capability and cycle performance. The half cells consisting of DC-CCSs retain 93.8% (97.12 mAh g−1 ) of the initial discharge capacity after 80 cycles, while the bare PE and SC-CCSs exhibit 22.5% and 26.6% capacity retention, respectively. The full cells consisting of DC-CCSs retain 90.9% (102.9 mAh g−1 ) of the initial discharge capacity after 400 cycles, while the bare PE and SC-CCS exhibit 64.7% and 73.4% capacity retention, respectively.
