| 학회 |
한국재료학회 |
| 학술대회 |
2017년 봄 (05/17 ~ 05/19, 목포 현대호텔) |
| 권호 |
23권 1호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
lithium compositional spatiodynamics within battery primary particles revealed via operando x-ray microscopy |
| 초록 |
The kinetics and uniformity of ion insertion reactions at the solid-liuid interface governs the rate capability and lifetime of Li-ion batteries. Using an operando xray microscopy platform that maps the dynamics of the Li composition and insertion rate in LixFePO4, we found that nanoscale spatial variations in rate and in composition comtrol the lithiation pathwa at the subparticle length scale. Specifically, spatial variations in the insertion rate constant lead to the formation of nonuniform domains, and the composition dependence of the rate constant amplifies nonuniformities during delithiation but suppresses them during lithiation, and moreover stabilizes the solid solution during lithiation. This coupling of lithium composition and surface reaction rates controls the kinetics and uniformity during electrochemical ion insertion. |
| 저자 |
임종우1, william chueh2, yiyang li2
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| 소속 |
1서울대, 2stanford Univ. |
| 키워드 |
operando; synchrotron; spatiodynamics; lithium ion battery; scanning transmission x-ray microscopy; stxm; single particle battery
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| E-Mail |
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