2024-10-29 アルゴンヌ国立研究所(ANL)
＜関連情報＞
- https://www.anl.gov/article/argonne-builds-on-past-success-with-cathode-design-for-lithiumion-batteries
- https://www.nature.com/articles/s41560-024-01605-8
組成的・構造的デュアルグラジエント設計により超安定な正極を実現 Ultrastable cathodes enabled by compositional and structural dual-gradient design
Tongchao Liu,Lei Yu,Junxiang Liu,Alvin Dai,Tao Zhou,Jing Wang,Weiyuan Huang,Luxi Li,Matthew Li,Tianyi Li,Xiaojing Huang,Xianghui Xiao,Mingyuan Ge,Lu Ma,Zengqing Zhuo,Rachid Amine,Yong S. Chu,Wah-Keat Lee,Jianguo Wen & Khalil Amine
Nature Energy Published02 August 2024
DOIhttps://doi.org/10.1038/s41560-024-01605-8
An Author Correction to this article was published on 21 August 2024
This article has been updated
Abstract
Cathodes for next-generation batteries are pressed for higher voltage operation (≥4.5 V) to achieve high capacity with long cyclability and thermal tolerance. Current cathodes fail to meet these requirements owing to structural and electrochemical strains at high voltages, leading to fast capacity fading. Here we present a cathode with a coherent architecture ranging from ordered to disordered frameworks with concentration gradient and controllable Ni oxidation activities, which can overcome voltage ceilings imposed by existing cathodes. This design enables simultaneous high-capacity and high-voltage operation at 4.5 V without capacity fading, and up to 4.7 V with negligible capacity decay. Multiscale diffraction and imaging techniques reveal the disordered surface is electrochemically and structurally indestructible, preventing surface parasitic reactions and phase transitions. Structural coherence from ordering to disordering limits lattice parameter changes, mitigating lattice strain and enhancing morphological integrity. The dual-gradient design also notably improves thermal stability, driving the advancement of high-performance cathode materials.
