2024-06-11 アルゴンヌ国立研究所(ANL)
＜関連情報＞
- https://www.anl.gov/article/scientists-find-new-way-to-enhance-durability-of-lithium-batteries
- https://www.nature.com/articles/s41560-024-01465-2
エピタキシャルエントロピーアシストコーティングにより、急速充電中の超高Ni正極のひずみ伝播を抑制 Suppressing strain propagation in ultrahigh-Ni cathodes during fast charging via epitaxial entropy-assisted coating
Chen Zhao,Chuanwei Wang,Xiang Liu,Inhui Hwang,Tianyi Li,Xinwei Zhou,Jiecheng Diao,Junjing Deng,Yan Qin,Zhenzhen Yang,Guanyi Wang,Wenqian Xu,Chengjun Sun,Longlong Wu,Wonsuk Cha,Ian Robinson,Ross Harder,Yi Jiang,Tekin Bicer,Jun-Tao Li,Wenquan Lu,Luxi Li,Yuzi Liu,Shi-Gang Sun,… Khalil Amine
Nature Energy Published:29 February 2024
DOI:https://doi.org/10.1038/s41560-024-01465-2
Abstract
Surface reconstruction and the associated severe strain propagation have long been reported as the major cause of cathode failure during fast charging and long-term cycling. Despite tremendous attempts, no known strategies can simultaneously address the electro-chemomechanical instability without sacrificing energy and power density. Here we report an epitaxial entropy-assisted coating strategy for ultrahigh-Ni LiNixCoyMn1−x−yO2 (x ≥ 0.9) cathodes via an oriented attachment-driven reaction between Wadsley–Roth phase-based oxides and the layered-oxide cathodes. The high anti-cracking and anti-corrosion tolerances as well as the fast ionic transport of the entropy-assisted surface effectively improved the fast charging/discharging capability, wide temperature tolerance and thermal stability of the ultrahigh-Ni cathodes. Comprehensive analysis from the primary and secondary particle level to the electrode level using multi-scale in situ synchrotron X-ray probes reveals greatly reduced lattice dislocations, anisotropic lattice strain and oxygen release as well as improved bulk/local structural stability, even when charging beyond the threshold state of charge (75%) of layered cathodes.
