Yang Lufeng, Li Xiang, Liu Jue, Xiong Shan, Ma Xuetian, Liu Pan, Bai Jianming, Xu Wenqian, Tang Yuanzhi, Hu Yan-Yan, Liu Meilin, Chen Hailong
The Woodruff School of Mechanical Engineering , Georgia Institute of Technology , 771 Ferst Drive , Atlanta , Georgia 30332-0245 , United States.
Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States.
J Am Chem Soc. 2019 Apr 24;141(16):6680-6689. doi: 10.1021/jacs.9b01855. Epub 2019 Apr 16.
While sodium-ion batteries (SIBs) hold great promise for large-scale electric energy storage and low speed electric vehicles, the poor capacity retention of the cathode is one of the bottlenecks in the development of SIBs. Following a strategy of using lithium doping in the transition-metal layer to stabilize the desodiated structure, we have designed and successfully synthesized a novel layered oxide cathode P2-NaLiFeMnO, which demonstrated a high capacity of 190 mAh g and a remarkably high capacity retention of ∼87% after 80 cycles within a wide voltage range of 1.5-4.5 V. The outstanding stability is attributed to the reversible migration of lithium during cycling and the elimination of the detrimental P2-O2 phase transition, revealed by ex situ and in situ X-ray diffraction and solid-state nuclear magnetic resonance spectroscopy.
虽然钠离子电池（SIBs）在大规模电能存储和低速电动汽车方面具有巨大潜力，但阴极容量保持率低是SIBs发展的瓶颈之一。遵循在过渡金属层中使用锂掺杂以稳定脱钠结构的策略，我们设计并成功合成了一种新型层状氧化物阴极P2-NaLiFeMnO，它在1.5-4.5V的宽电压范围内表现出190 mAh g的高容量，并且在80次循环后容量保持率高达约87%。这种出色的稳定性归因于循环过程中锂的可逆迁移以及有害的P2-O2相变的消除，这通过非原位和原位X射线衍射以及固态核磁共振光谱得以揭示。
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