阴极
材料科学
钴
热稳定性
电化学
复合材料
电极
化学工程
纳米技术
冶金
电气工程
化学
工程类
物理化学
作者
Rui Zhang,Chunyang Wang,Peichao Zou,Ruoqian Lin,Lu Ma,Liang Yin,Tianyi Li,Wenqian Xu,Hao Jia,Qiuyan Li,Sami Sainio,Kim Kisslinger,Stephen E. Trask,Steven N. Ehrlich,Yang Yang,Andrew M. Kiss,Mingyuan Ge,Bryant J. Polzin,Sang‐Jun Lee,Wu Xu,Yang Ren,Huolin L. Xin
出处
期刊:Nature
[Springer Nature]
日期:2022-09-21
卷期号:610 (7930): 67-73
被引量:288
标识
DOI:10.1038/s41586-022-05115-z
摘要
The high volatility of the price of cobalt and the geopolitical limitations of cobalt mining have made the elimination of Co a pressing need for the automotive industry1. Owing to their high energy density and low-cost advantages, high-Ni and low-Co or Co-free (zero-Co) layered cathodes have become the most promising cathodes for next-generation lithium-ion batteries2,3. However, current high-Ni cathode materials, without exception, suffer severely from their intrinsic thermal and chemo-mechanical instabilities and insufficient cycle life. Here, by using a new compositionally complex (high-entropy) doping strategy, we successfully fabricate a high-Ni, zero-Co layered cathode that has extremely high thermal and cycling stability. Combining X-ray diffraction, transmission electron microscopy and nanotomography, we find that the cathode exhibits nearly zero volumetric change over a wide electrochemical window, resulting in greatly reduced lattice defects and local strain-induced cracks. In-situ heating experiments reveal that the thermal stability of the new cathode is significantly improved, reaching the level of the ultra-stable NMC-532. Owing to the considerably increased thermal stability and the zero volumetric change, it exhibits greatly improved capacity retention. This work, by resolving the long-standing safety and stability concerns for high-Ni, zero-Co cathode materials, offers a commercially viable cathode for safe, long-life lithium-ion batteries and a universal strategy for suppressing strain and phase transformation in intercalation electrodes. A compositionally complex (high-entropy) doping strategy is proposed to fabricate zero-strain high-Ni and Co-free layered cathodes with superior structural and mechanical stabilities and long cycle life.
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