Nam-Yung Park, Sang-Mun Han, Ji-Hyun Ryu, Myoung-Chan Kim, Jung-In Yoon, Jae-Ho Kim, Geon-Tae Park, Joop Enno Frerichs, Christoph Erk and Yang-Kook Sun*,
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引用次数: 0
Abstract
Crystallinity and microstructure, fundamental properties of cathode materials, are determined during the calcination process. Increasing the calcination temperature to improve crystallinity induces grain coarsening in multiple directions, resulting in the polygonal primary particles with heterogeneous size distribution. Here, grain coarsening was controlled by introducing Nb segregated at grain boundaries, and a microstructure with homogeneous primary particles evolved under a balanced coarsening force. The homogeneous size distribution of the primary particles improved not only the mechanical stability of the cathode particles but also the resistance to microcrack propagation during cycling. The Nb-doped Ni-rich cathode with homogeneous primary particle size retained 90.0% of its initial capacity after 500 cycles by suppressing electrolyte infiltration along the microcracks and subsequent degradation. This study demonstrates that improving the mechanical stability of cathode particles by tightly packing homogeneous primary particles is a key factor in improving the cycling stability of Ni-rich cathodes.
ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment
CiteScore
31.20
自引率
5.00%
发文量
469
审稿时长
1 months
期刊介绍:
ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format.
ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology.
The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.