Otavio Augusto Titton Dias, Farnaz Azarnia, Keerti Rathi, Viktoriya Pakharenko, Vijay K. Tomer and Mohini Sain
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引用次数: 0
摘要
深入研究了单晶结构和双重掺杂在富锂无钴正极材料中的协同效应。采用掺杂了 Sb/Sn 的 Li1.2Mn0.6Ni0.2O2 和石墨的锂离子袋式电池在 1C 速率下的比容量为 191.01 mA h g-1,循环性能异常稳定,在 1C 速率下循环 250 次后,容量保持率为初始容量的 87.24%。形貌处理和双离子掺杂的策略性结合明显减少了阳离子混合,扩大了阴极晶格内的锂间隙位点。这项研究深入揭示了富锂离子无钴阴极结构衰退的机理,强调了在高电势下稳定阴极晶格结构的重要性。这些发现表明,这种材料在满足电动汽车高能量密度标准方面具有广阔的潜力。最后,这项研究为有效实施高压无钴阴极提供了实用的策略,为未来的应用提供了宝贵的指导。
Rational design of dual-ion doped cobalt-free Li-rich cathode materials for enhanced cycle stability of lithium-ion pouch cell batteries†
The synergistic effect of single-crystal structure and dual doping in Li-rich cobalt-free cathode materials was thoroughly investigated. Lithium-ion pouch cells employing Sb/Sn doped Li1.2Mn0.6Ni0.2O2 and graphite exhibited a specific capacity of 191.01 mA h g−1 at 1C rate and exceptionally stable performance upon cycling, with capacity retention of 87.24% of their initial capacity after 250 cycles at 1C rate. The strategic combination of morphology manipulation and dual ion doping has markedly diminished cation mixing and expanded the Li interstitial sites within the cathode lattice. This work offers significant insights into the mechanisms responsible for the structural decline of Li-rich cobalt-free cathodes, emphasizing the importance of stabilizing the cathode lattice structure at high potential. These findings suggest promising potential for this material to meet the demanding energy density criteria for electric vehicles. Finally, this research provides practical strategies for effectively implementing high-voltage cobalt-free cathodes, offering valuable guidance for future applications.
期刊介绍:
Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.