Building High-Rate Nickel-Rich Cathodes by Self-Organization of Structurally Stable Macrovoid
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- Building High-Rate Nickel-Rich Cathodes by Self-Organization of Structurally Stable Macrovoid
- Kalluri, Sujith; Cha, Hyungyeon; Kim, Junhyeok; Lee, Hyomyung; Jang, Haeseong; Cho, Jaephil
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- ADVANCED SCIENCE
- 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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