---
_id: '7302'
abstract:
- lang: eng
  text: Understanding charge carrier transport in Li2O2, the storage material in the
    non-aqueous Li-O2 battery, is key to the development of this high-energy battery.
    Here, we studied ionic transport properties and Li self-diffusion in nanocrystalline
    Li2O2 by conductivity and temperature variable 7Li NMR spectroscopy. Nanostructured
    Li2O2, characterized by a mean crystallite size of less than 50 nm as estimated
    from X-ray diffraction peak broadening, was prepared by high-energy ball milling
    of microcrystalline lithium peroxide with μm sized crystallites. At room temperature
    the overall conductivity σ of the microcrystalline reference sample turned out
    to be very low (3.4 × 10−13 S cm−1) which is in agreement with results from temperature-variable
    7Li NMR line shape measurements. Ball-milling, however, leads to an increase of
    σ by approximately two orders of magnitude (1.1 × 10−10 S cm−1); correspondingly,
    the activation energy decreases from 0.89 eV to 0.82 eV. The electronic contribution
    σeon, however, is in the order of 9 × 10−12 S cm−1 which makes less than 10% of
    the total value. Interestingly, 7Li NMR lines of nano-Li2O2 undergo pronounced
    heterogeneous motional narrowing which manifests in a two-component line shape
    emerging with increasing temperatures. Most likely, the enhancement in σ can be
    traced back to the generation of a spin reservoir with highly mobile Li ions;
    these are expected to reside in the nearest neighbourhood of defects generated
    or near the structurally disordered and defect-rich interfacial regions formed
    during mechanical treatment.
article_processing_charge: No
article_type: original
author:
- first_name: A.
  full_name: Dunst, A.
  last_name: Dunst
- first_name: V.
  full_name: Epp, V.
  last_name: Epp
- first_name: I.
  full_name: Hanzu, I.
  last_name: Hanzu
- first_name: Stefan Alexander
  full_name: Freunberger, Stefan Alexander
  id: A8CA28E6-CE23-11E9-AD2D-EC27E6697425
  last_name: Freunberger
  orcid: 0000-0003-2902-5319
- first_name: M.
  full_name: Wilkening, M.
  last_name: Wilkening
citation:
  ama: Dunst A, Epp V, Hanzu I, Freunberger SA, Wilkening M. Short-range Li diffusion
    vs. long-range ionic conduction in nanocrystalline lithium peroxide Li2O2—the
    discharge product in lithium-air batteries. <i>Energy &#38; Environmental Science</i>.
    2014;7(8):2739-2752. doi:<a href="https://doi.org/10.1039/c4ee00496e">10.1039/c4ee00496e</a>
  apa: Dunst, A., Epp, V., Hanzu, I., Freunberger, S. A., &#38; Wilkening, M. (2014).
    Short-range Li diffusion vs. long-range ionic conduction in nanocrystalline lithium
    peroxide Li2O2—the discharge product in lithium-air batteries. <i>Energy &#38;
    Environmental Science</i>. RSC. <a href="https://doi.org/10.1039/c4ee00496e">https://doi.org/10.1039/c4ee00496e</a>
  chicago: Dunst, A., V. Epp, I. Hanzu, Stefan Alexander Freunberger, and M. Wilkening.
    “Short-Range Li Diffusion vs. Long-Range Ionic Conduction in Nanocrystalline Lithium
    Peroxide Li2O2—the Discharge Product in Lithium-Air Batteries.” <i>Energy &#38;
    Environmental Science</i>. RSC, 2014. <a href="https://doi.org/10.1039/c4ee00496e">https://doi.org/10.1039/c4ee00496e</a>.
  ieee: A. Dunst, V. Epp, I. Hanzu, S. A. Freunberger, and M. Wilkening, “Short-range
    Li diffusion vs. long-range ionic conduction in nanocrystalline lithium peroxide
    Li2O2—the discharge product in lithium-air batteries,” <i>Energy &#38; Environmental
    Science</i>, vol. 7, no. 8. RSC, pp. 2739–2752, 2014.
  ista: Dunst A, Epp V, Hanzu I, Freunberger SA, Wilkening M. 2014. Short-range Li
    diffusion vs. long-range ionic conduction in nanocrystalline lithium peroxide
    Li2O2—the discharge product in lithium-air batteries. Energy &#38; Environmental
    Science. 7(8), 2739–2752.
  mla: Dunst, A., et al. “Short-Range Li Diffusion vs. Long-Range Ionic Conduction
    in Nanocrystalline Lithium Peroxide Li2O2—the Discharge Product in Lithium-Air
    Batteries.” <i>Energy &#38; Environmental Science</i>, vol. 7, no. 8, RSC, 2014,
    pp. 2739–52, doi:<a href="https://doi.org/10.1039/c4ee00496e">10.1039/c4ee00496e</a>.
  short: A. Dunst, V. Epp, I. Hanzu, S.A. Freunberger, M. Wilkening, Energy &#38;
    Environmental Science 7 (2014) 2739–2752.
date_created: 2020-01-15T12:17:43Z
date_published: 2014-08-01T00:00:00Z
date_updated: 2021-01-12T08:12:53Z
day: '01'
doi: 10.1039/c4ee00496e
extern: '1'
intvolume: '         7'
issue: '8'
language:
- iso: eng
month: '08'
oa_version: Published Version
page: 2739-2752
publication: Energy & Environmental Science
publication_identifier:
  issn:
  - 1754-5692
  - 1754-5706
publication_status: published
publisher: RSC
quality_controlled: '1'
status: public
title: Short-range Li diffusion vs. long-range ionic conduction in nanocrystalline
  lithium peroxide Li2O2—the discharge product in lithium-air batteries
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 7
year: '2014'
...