| 학회 |
한국화학공학회 |
| 학술대회 |
2020년 가을 (10/14 ~ 10/16, e-컨퍼런스) |
| 권호 |
26권 1호, p.908 |
| 발표분야 |
Highly Cited Researcher 특별 심포지엄 |
| 제목 |
Boosting Reaction Homogeneity in High-Energy Lithium-Ion Battery Cathode Materials |
| 초록 |
An intrinsic limitation of polycrystalline nickel-rich cathode materials in high-energy full-cells is discovered under industrial electrode fabrication conditions. Owing to their highly unstable chemo-mechanical properties, even after the first cycle, nickel-rich materials are degraded in the longitudinal direction of the high-energy electrode. This inhomogeneous degradation behavior of nickel-rich materials at the electrode level originates from the overutilization of active materials on the surface side, causing a severe non- uniform potential distribution during long-term cycling. In addition, this phenomenon continuously lowers the reversibility of lithium ions. Consequently, considering the degradation of polycrystalline nickel-rich materials, this study suggests the adoption of a robust single crystalline LiNi0.8Co0.1Mn0.1O2 as a feasible alternative, to effectively suppress the localized overutilization of active materials. Such an adoption, can stabilize the electrochemical performance of high-energy lithium-ion cells, which demonstrates superior capacity retention above ~80% after 1,000 cycles at 45oC. |
| 저자 |
Jaephil Cho, Hyungyeon Cha, Junhyeok Kim
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| 소속 |
Ulsan National Institute of Science and Technology |
| 키워드 |
lithium-ion battery; electrode; nickel-rich cathode; reaction heterogeneity; single crystal
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| E-Mail |
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| 원문파일 |
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