"Zero-Strain" NiNb2O6 Fibers for All-Climate Lithium Storage.

Autor: Zhao, Yan, Yuan, Qiang, Yang, Liting, Liang, Guisheng, Cheng, Yifeng, Wu, Limin, Lin, Chunfu, Che, Renchao
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Zdroj: Nano-Micro Letters; 9/27/2024, Vol. 17 Issue 1, p1-13, 13p
Abstrakt: Highlights: "Zero-strain" NiNb2O6 fibers with nanosized primary particles are explored as an all-climate anode material with comprehensively good Li+-storage properties. The almost completely opposite volume changes of electrochemical inactive NiO6 octahedra and active NbO6 octahedra are achieved through reversible O movement, leading to the "zero-strain" behavior of NiNb2O6 with minor unit-cell-volume change and excellent cyclability in a broad temperature range. The gained insight can provide guide for the exploration of high-performance energy-storage materials working at harsh temperatures. Niobates are promising all-climate Li+-storage anode material due to their fast charge transport, large specific capacities, and resistance to electrolyte reaction. However, their moderate unit-cell-volume expansion (generally 5%–10%) during Li+ storage causes unsatisfactory long-term cyclability. Here, "zero-strain" NiNb2O6 fibers are explored as a new anode material with comprehensively good electrochemical properties. During Li+ storage, the expansion of electrochemical inactive NiO6 octahedra almost fully offsets the shrinkage of active NbO6 octahedra through reversible O movement. Such superior volume-accommodation capability of the NiO6 layers guarantees the "zero-strain" behavior of NiNb2O6 in a broad temperature range (0.53%//0.51%//0.74% at 25// − 10//60 °C), leading to the excellent cyclability of the NiNb2O6 fibers (92.8%//99.2% // 91.1% capacity retention after 1000//2000//1000 cycles at 10C and 25// − 10//60 °C). This NiNb2O6 material further exhibits a large reversible capacity (300//184//318 mAh g−1 at 0.1C and 25// − 10//60 °C) and outstanding rate performance (10 to 0.5C capacity percentage of 64.3%//50.0%//65.4% at 25// − 10//60 °C). Therefore, the NiNb2O6 fibers are especially suitable for large-capacity, fast-charging, long-life, and all-climate lithium-ion batteries. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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