Building High-Rate Nickel-Rich Cathodes by Self-Organization of Structurally Stable Macrovoidopen access
- Authors
- Kalluri, Sujith; Cha, Hyungyeon; Kim, Junhyeok; Lee, Hyomyung; Jang, Haeseong; Cho, Jaephil
- Issue Date
- Apr-2020
- Publisher
- WILEY
- Keywords
- high-power lithium ion batteries; Kirkendall effect; LiNi0; 6>Co0; 2Mn0; 2O(2); macrovoid structure; one-pot synthesis
- Citation
- ADVANCED SCIENCE, v.7, no.7
- Journal Title
- ADVANCED SCIENCE
- Volume
- 7
- Number
- 7
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/69329
- DOI
- 10.1002/advs.201902844
- ISSN
- 2198-3844
2198-3844
- Abstract
- Nickel-rich materials, as a front-running cathode for lithium-ion batteries suffer from inherent degradation issues such as inter/intragranular cracks and phase transition under the high-current density condition. Although vigorous efforts have mitigated these current issues, the practical applications are not successfully achieved due to the material instability and complex synthesis process. Herein, a structurally stable, macrovoid-containing, nickel-rich material is developed using an affordable, scalable, and one-pot coprecipitation method without using surfactants/etching agents/complex-ion forming agents. The strategically developed macrovoid-induced cathode via a self-organization process exhibits excellent full-cell rate capability, cycle life at discharge rate of 5 C, and structural stability even at the industrial electrode conditions, owing to the fast Li-ion diffusion, the internal macrovoid acting as "buffer zones" for stress relief, and highly stable nanostructure around the void during cycling. This strategy for nickel-rich cathodes can be viable for industries in the preparation of high-performance lithium-ion cells.
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