4.8 Article

Electrochemically induced amorphous-to-rock-salt phase transformation in niobium oxide electrode for Li-ion batteries

期刊

NATURE MATERIALS
卷 21, 期 7, 页码 795-+

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NATURE PORTFOLIO
DOI: 10.1038/s41563-022-01242-0

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资金

  1. National Science Foundation [DMR-1454984]
  2. National Science Foundation Major Research Instrumentation Program [1727026]
  3. US Department of Energy, Office of Basic Energy Sciences [DE-AC02-06CH11357]
  4. US Department of Energy Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [10122]
  5. Biological and Environmental Research programme
  6. National Science Foundation Materials Research Science and Engineering Center programme through the University of California, Irvine Center for Complex and Active Materials [DMR-2011967]
  7. US Department of Energy Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05-CH11231]
  8. Extreme Science and Engineering Discovery Environment [ACI-1548562]
  9. Direct For Mathematical & Physical Scien
  10. Division Of Materials Research [1727026] Funding Source: National Science Foundation

向作者/读者索取更多资源

A nanostructured rock-salt Nb2O5 electrode formed through amorphous-to-crystalline transformation during cycling with Li+ exhibits superb cycling stability and high capacity at high rates.
Intercalation-type metal oxides are promising negative electrode materials for safe rechargeable lithium-ion batteries due to the reduced risk of Li plating at low voltages. Nevertheless, their lower energy and power density along with cycling instability remain bottlenecks for their implementation, especially for fast-charging applications. Here, we report a nanostructured rock-salt Nb2O5 electrode formed through an amorphous-to-crystalline transformation during repeated electrochemical cycling with Li+. This electrode can reversibly cycle three lithiums per Nb2O5, corresponding to a capacity of 269 mAh g(-1) at 20 mA g(-1), and retains a capacity of 191 mAh g(-1) at a high rate of 1 A g(-1). It exhibits superb cycling stability with a capacity of 225 mAh g(-1) at 200 mA g(-1) for 400 cycles, and a Coulombic efficiency of 99.93%. We attribute the enhanced performance to the cubic rock-salt framework, which promotes low-energy migration paths. Our work suggests that inducing crystallization of amorphous nanomaterials through electrochemical cycling is a promising avenue for creating unconventional high-performance metal oxide electrode materials. Intercalation-type metal oxides are promising anodes for Li-ion batteries but suffer from low energy and power density together with cycling instability. A nanostructured rock-salt Nb2O5 formed via amorphous-to-crystalline transformation during cycling with Li+ is shown to exhibit enhanced performance.

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