2026-05-07 中国科学院（CAS）
Multi-element doping strategy for modulating phase transformation pathways and structural characterization of the material. (Image by IMR)
＜関連情報＞
- https://english.cas.cn/newsroom/research-news/202605/t20260511_1159105.shtml
- https://pubs.acs.org/doi/10.1021/jacs.6c00611
組成的に複雑なドーピングにより、超高速充電と化学電気機械的安定性を備えた高電圧スピネルカソードが実現 Compositionally Complex Doping Enables High-Voltage Spinel Cathodes with Ultrafast Charging and Chemo-Electro-Mechanical Stability
Huize Wu,Chenhao Zhang,Siqi Guan,Pei Tang,Xulin Mu,Yutao Niu,Chunyang Wang,and Feng Li
Journal of the American Chemical Society Published May 6, 2026
DOI:https://doi.org/10.1021/jacs.6c00611
Abstract
Next-generation lithium-ion batteries demand high-voltage cathodes that combine exceptional stability with ultrafast charging capability. Cobalt-free spinel-type oxides, owing to their high operating voltage, energy density, and cost effectiveness, are leading candidates, yet their cycle life is still constrained by intrinsic chemo-electro-mechanical instabilities. Here, by leveraging compositionally complex doping, we reconfigure the reaction thermodynamics of a high-voltage spinel cathode by extending its solid-solution regime to higher states of charge, enabling ultrafast charging while maintaining robust chemo-electro-mechanical stability. Multimodal characterization reveals that the reshaped reaction pathway effectively suppresses high-temperature intragranular cracking, interfacial rock salt phase transformation, and parasitic byproduct accumulation, thereby preserving efficient three-dimensional Li+ diffusion. The cathode delivers unprecedented ultrafast-charging durability, achieving 81.8% after 4000 cycles at 10 C (25 °C) and 82.0% after 1000 cycles at 3 C (60 °C). Our work demonstrates that compositionally complex doping can effectively modulate the thermodynamics of phase transformation and enhance the chemo-electro-mechanical stability of high-voltage spinel cathodes, providing new insights into the design of durable fast-charging cathode materials.
