Author: Nilüfer Çakmakçı Lee†, J.Lee, J.Choi, I.Bae, J.Bang, H.Kim, D.Lee, J.Han, J.Kwak, J.Kim*, Y.Jeong*Title: Equal mass, unequal impact: Particle density and bending rigidity of carbon nanotube additives govern silicon anode performanceJournal: Journal of Power SourcesYear: 2026Impact factor: 8.4Abstract:Silicon offers a much higher lithium storage capacity than graphite but suffers from severe volume expansion during cycling, which undermines electrode stability. Carbon nanotubes (CNTs) are widely employed to address this limitation, yet their coupled mechanical and electrical functions remain poorly understood. Here, we systematically compare single-walled (SWCNT) and multi-walled (MWCNT) carbon nanotubes as conductive additives in silicon nanoparticle anodes at identical loadings (0.5–5 wt%). SWCNTs are theoretically estimated to provide over 103 times more individual tubes per gram, forming dense percolation networks that enable rapid charge–discharge performance (2330 mAh g−1 at 3 C, 5 wt%). MWCNTs, though fewer in number, exhibit higher bending rigidity, restricting electrode thickening to ∼50% after 10 cycles. At CNT contents below 1 wt%, capacity retention scales with particle population, emphasizing the dominance of physical contact over intrinsic conductivity. These results decouple the roles of particle density (SWCNT) and mechanical stiffness (MWCNT), offering practical guidelines for optimizing CNT selection in cost-effective, high-energy silicon anodes.

산업통상부에서 시행하는 '2026년 첨단제조융합인재육성지원사업' 방산 부문에 김효경 박사 후 연구원이 선정되었습니다. 축하드립니다~~!

Author: H.Kim†, I.Bae†, J.Kwak, H.Son, J.Kim*Title: Oxygen incorporation in Ti2AlC MAX phases as bond coats: Multi-scale simulations for enhanced thermal shock resistanceJournal: Journal of Materials Research and TechnologyYear: 2026Impact factor: 6.6Abstract:In thermal barrier coating (TBC) systems, MAX phases have emerged as potential alternatives to conventional metallic bond coats (BCs). Using multi-scale simulations, we examined how oxygen incorporation affects the high-temperature behavior of Ti2AlC. Although oxygen is typically considered harmful in BCs, Ti2Al(C1-xOx) showed different results that moderate oxygen incorporation lowers Young's modulus and increases the thermal expansion coefficient. This oxygen-induced softening effectively mitigates the large stiffness and thermal-expansion between the ceramic top coat and the superalloy substrate, thereby reducing thermal stress. Comparisons with CoNiCrAlY and (Ni,Pt)Al across several substrates showed that Ti2Al(C1-xOx) consistently produced lower stresses, particularly near the thermally grown oxide (TGO)–BC interface where failure usually initiates. These results indicate that oxygen incorporation, unavoidable in practical situations, can be used to tune Ti2AlC for improved reliability, supporting its use as a next-generation BC.

생일 축하합니다~!

김효경, 김상은 연구원이 전북대 권한중 교수님 연구실에 방문하여 MAX 상 합성 실험 교류를 진행하였습니다. 지속적으로 교류하여 좋은 성과 거뒀으면 좋겠습니다.

6월 24일부터 26일까지 무주 덕유산 리조트에서 진행된 Korean Engineering Ceramics Division 학회를 참석하여 다녀왔습니다. 다들 많이 배울 수 있어 좋은 경험이었습니다. CMD 화이팅!