Chen Pei-Pei, Zhang Bo-Han, Li Zi-Ang, Lei Jia-Ting, Chen Jing-Zhou, Hou Yun-Lei, Zhao Dong-Lin
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, Beijing, 100029, P. R. China.
Small. 2024 Oct;20(40):e2403079. doi: 10.1002/smll.202403079. Epub 2024 Jun 3.
Phosphate-based electrolyte propels the advanced battery system with high safety. Unfortunately, restricted by poor electrochemical stability, it is difficult to be compatible with advanced lithium metal anodes and Ni-rich cathodes. To alleviate these issues, the study has developed a phosphate-based localized high-concentration electrolyte with a nitrate-driven solvation structure, and the nitrate-derived N-rich inorganic interface shows excellent performance in stabilizing the LiNiCoMnO (NCM811) cathode interface and modulating the lithium deposition morphology on the anode. The results show that the Li|| NCM811 cell has exceptional long-cycle stability of >80% capacity retention after 800 cycles at 4.3 V, 1 C. A more prominent capacity retention rate of 93.3% after 200 cycles can be reached with the high voltage of 4.5 V. While being compatible with the phosphate-based electrolyte with good flame retardancy and the good electrochemical stability of Ni-rich lithium metal battery (LMBs) systems, the present work expands the construction of anion-rich solvation structures, which is expected to promote the development of the high-performance LMBs with safety.
基于磷酸盐的电解质推动了具有高安全性的先进电池系统的发展。不幸的是，由于电化学稳定性较差，它难以与先进的锂金属负极和富镍正极兼容。为了缓解这些问题，该研究开发了一种具有硝酸盐驱动溶剂化结构的基于磷酸盐的局部高浓度电解质，并且硝酸盐衍生的富氮无机界面在稳定LiNiCoMnO（NCM811）正极界面和调节阳极上的锂沉积形态方面表现出优异的性能。结果表明，Li||NCM811电池在4.3 V、1 C下800次循环后具有超过80%的容量保持率的出色长循环稳定性。在4.5 V的高电压下，200次循环后可达到更突出的93.3%的容量保持率。在与具有良好阻燃性的基于磷酸盐的电解质以及富镍锂金属电池（LMBs）系统的良好电化学稳定性兼容的同时，本工作扩展了富阴离子溶剂化结构的构建，有望推动具有安全性的高性能LMBs的发展。
